US3586423A - Method of improving color discrimination - Google Patents
Method of improving color discrimination Download PDFInfo
- Publication number
- US3586423A US3586423A US49582A US3586423DA US3586423A US 3586423 A US3586423 A US 3586423A US 49582 A US49582 A US 49582A US 3586423D A US3586423D A US 3586423DA US 3586423 A US3586423 A US 3586423A
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- United States
- Prior art keywords
- red
- eye
- lens
- contact lens
- color discrimination
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- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/04—Contact lenses for the eyes
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/10—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
- G02C7/104—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses having spectral characteristics for purposes other than sun-protection
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/10—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
- G02C7/108—Colouring materials
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
- G02C2202/10—Optical elements and systems for visual disorders other than refractive errors, low vision
Definitions
- This invention relates to a method for improving color discrimination.
- it relates to a method and device for improving color discrimination in persons who are red-green color deficient:
- lt is generally believed that a person with normal color vision is able to discern an uninterrupted series of hues from red of about 760 millimicrons to violet of about 380 millimicrons with no black, grey or white areas. Persons with normal color vision clearly differentiate between the seven ordinary hues of red, orange, yellow, green, blue, indigo and violet.
- color discrimination deficiency a vision defect known as color discrimination deficiency or color blindness
- color blindness a lack of a part of the neural apparatus necessary for normal color vision.
- redgreen color blindness A person having such color blindness has great difficulty in distinguishing brown from green and sees various shades of red (such as pink) as grey.
- redgreen color blindness has been a great handicap to the persons involved, particularly with respect to their occupations, wherein color is a growing form of object identification.
- colorblind persons, of whom there are about 8 million in the United States are a hazard to themselves and to others, particularly in automobile driving and in hunting.
- One object of the present invention is-to provide a method and device of improving color discrimination among persons having color discrimination deficiency to such an extend that use of the method or device can extend for a full day, including nighttime without inhibiting the mobility of the person and without interfering with his normal everyday tasks.
- the invention comprises the use on one eye only of a corneal contact lens transmitting light substantially only in the red zone, with the other eye remaining naked or having its customary refractive correction, if any.
- the lens should be as thin as possible to avoid substantial loss of visual acuity.
- this single red corneal contact lens can be used with either the dominant or nondominant eye, I have noted that placing the lens on the nondominant eye appears to be more comfortable for the user.
- the single red corneal contact lens of this invention can be made so as to incorporate a desired refractive correction, or it can be used with a spectacle lens having the correction for that same eye or the refractive correction can be divided between the contact lens and the spectacle lens.
- the other eye, not covered with a red contact lens, can have required refractive correction in the form of a conventional contact lens or spectacle lens or both.
- a color deficient person who is without refractive error but requires reading glasses (spectacle lenses), as in presbyopia could use reading glasses in conjunction with the single red corneal contact lens of this invention.
- the other eye can have a conventional corrective corneal contact lens I have found by experimentation that thickness is a factor which limits the utility of a colored contact lens made in accordance with this invention.
- the resultant contact lens may be so thick as to be overly dark for effective use. Accordingly, in such a case, a single red contact lens having no correction would be used in conjunction with a spectacle lens having the desired refractive correction.
- the red contact lens may be kept thin enough to permit sufficient visual acuity. in general, the acuity should be at least 20/40 so that stereopsis is not lost.
- the amount of light absorption by the contact lens of this invention also has an efiect on its utility. Thus, if the lens absorbs more than approximately 86 percent of the light, that is to say has light transmission of less than approximately 14 percent, binocular vision is affected. Further, if the amount of light absorption is less than approximately 60 percent, that is to say the transmission is higher than about 40 percent, color discrimination ability begins to decrease. These percentages might be better understood if one notes that a plain contact lens has about 10 percent loss or 90 percent transmission, while a lightly tinted lens has about 30 percent absorption or 70 percent transmission.
- the corneal contact lens of this invention can be made from a variety of materials, I prefer to use clear transparent plastic materials such as the polymethacrylate resin group.
- An example of such a resin which I have found useful is polymethylmethacrylate.
- the red contact lens of this invention is used monocularly.
- the uncovered" eye receives a colordeficient image while the lens-covered eye receives an image which is differently shaded.
- the individual goes through a brief self-learning process in the true color.
- the typical color discrimination deficient person cannot tell green from brown. From experiments with my patients, I have determined that with my invention the person sees green darker and brown lighter.
- the uncovered" eye is an important factor in this invention, since it receives certain colors correctly which are obscured in the eye covered with the single red contact lens. I have found that each eye compensates for the disability of the other by a process which is a form of rectinal rival," a phenomenon of the visual mechanism.
- the single red corneal contact lens of this invention can be used generally with persons deficient in color discrimination, there are certain contra-indicators.
- the lens of this invention should not be used where there is corneal pathology such as keratitis or where there are other diseases of the eye wherein the use of conventional corneal contact lenses are contra-indicated.
- the single corneal contact lens of this invention would not be expected to improve color perception in persons who have amblyopia, strabismus or monocular vision.
- a contact lens which was made of red polymethacrylate.
- the lens had a radius of 8.23 mm, a diameter of 9.0 mm. and a thickness of 0.23 mm.
- lt had a peripheral bevel of ll.00/0.3, a secondary curve of 9.00/07 and an optic zone of 8.00.
- the lens transmitted substantially only in the red zone with practically no transmission below about 590 millimicrons, a peak at about 624 millimicrons, a range of about 590 to 700 millimicrons and an absorption of about 86 percent.
- a method for improving color discrimination in a person deficient in color discrimination comprising the step of applying to one eye only a thin corneal contact lens transmitting light substantially only in the red zone and having between approximately l4 and 40 percent light transmission and substantially no transmission below approximately 590 millimicrons, the other eye being left uncovered except for the optional use of a spectacle lens, conventional corneal contact lens, or a combination thereof to provide a desired refractive correction for that eye.
- red lens is made of a polymethacrylate resin and has a thickness of approximately 0.23 millimeters.
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Eyeglasses (AREA)
Abstract
A method and device are described for improving color discrimination in persons having a substantial amount of deficiency in their ability to discriminate between red and green colors, commonly referred to as ''''color blindness.'''' The invention comprises applying to one eye only a corneal contact lens transmitting light substantially only in the red zone and leaving the other eye either naked or with its customary refractive correction, if any.
Description
United States Patent [72] Inventor Harr l. Zeltzer 9 Rumford. Lexington. Mass. 02173 [2|] Appl. No. 49.582
[22] Filed June 24, 1970 [45] Patented June 22, 197i Continuation-impart of application Ser. No. 857,543, Sept. 12, 1969, now abandoned which is a continuation-in-part of application Ser. No. 462,068, June 7, 1965, now abandoned.
[54] METHOD OF IMPROVING COLOR DISCRIMINATION 3 Claims, No Drawings [52] U.S.Cl 351/39, 351/41, 351/44,?151/162 [5 1] Int. Cl G02c 7/10,
50 FieldofSearch .35l/26,35, 39,4l,44,162,l63
[561 References Cited FORElGN PATENTS 617 I877 GreatBritain 351/41 1,370,642 7/1964 France 351/162 Primary Examiner-David Schonberg Assistant Examiner.lohn W. Leonard Attorney-Joseph Zallen ABSTRACT: A method and device are described for improving color discrimination in persons having a substantial amount of deficiency in their ability to discriminate between red and green colors, commonly referred to as color blindness." The invention comprises applying to one eye only a corneal contact lens transmitting light substantialiy only in the red zone and leaving the other eye either naked or with its customary refractive correction, if any.
METHOD OF IMPROVING COLOR DISCRIMINATION This is a continuation-impart of my prior copending Pat. application, Ser. No. 857,543, filed Sept. 12, 1969 now abandoned, which in turn was a continuation-in-part of my then copending Pat. application, Ser. No. 462,068, filed June 7, 1965 and now abandoned.
BACKGROUND OF INVENTION This invention relates to a method for improving color discrimination. In particular, it relates to a method and device for improving color discrimination in persons who are red-green color deficient:
lt is generally believed that a person with normal color vision is able to discern an uninterrupted series of hues from red of about 760 millimicrons to violet of about 380 millimicrons with no black, grey or white areas. Persons with normal color vision clearly differentiate between the seven ordinary hues of red, orange, yellow, green, blue, indigo and violet.
However, according to some authorities, approximately 8 percent of males have a vision defect known as color discrimination deficiency or color blindness, a lack of a part of the neural apparatus necessary for normal color vision. Such neural defects are not completely understood. it is generally agreed that the most common type of color blindness is the inability to distinguish between red and green, known as redgreen color blindness. A person having such color blindness has great difficulty in distinguishing brown from green and sees various shades of red (such as pink) as grey. Such redgreen color blindness has been a great handicap to the persons involved, particularly with respect to their occupations, wherein color is a growing form of object identification. Further, colorblind persons, of whom there are about 8 million in the United States, are a hazard to themselves and to others, particularly in automobile driving and in hunting.
This problem of color discrimination deficiency has been reported and studied for many years. However, no one, to my knowledge, has ever suggested or proposed any method or device that would enable a person who had red-green color discrimination deficiency to improve it to any practical or substantial extent. Thus, although proposals have been made in the past to improve the ability of such persons to distinguish between red and green colored signal lights, no method or device has heretofore been proposed to improve the ability of such persons to discriminate between such colors in their everyday normal existence.
One object of the present invention is-to provide a method and device of improving color discrimination among persons having color discrimination deficiency to such an extend that use of the method or device can extend for a full day, including nighttime without inhibiting the mobility of the person and without interfering with his normal everyday tasks.
Further objects and advantages of this present invention will be apparent from the description and claims which follow.
SUMMARY OF INVENTION The invention comprises the use on one eye only of a corneal contact lens transmitting light substantially only in the red zone, with the other eye remaining naked or having its customary refractive correction, if any. The lens should be as thin as possible to avoid substantial loss of visual acuity. Although this single red corneal contact lens can be used with either the dominant or nondominant eye, I have noted that placing the lens on the nondominant eye appears to be more comfortable for the user.
When such a lens is worn in this fashion, a patient who could not hitherto pass the lshihara test wherein red and green spot figures are used, was now able with my invention to pass this test and distinguish among brown, green, red and pink objects, which he had hitherto been unable to do. The lens can be worn either day or night or both with no special requirements except those of cleanliness and removal when sleeping nonnally associated with contact lenses. The use of this lens V with or without spectacles.
does not interfere with the persons mobility or his performance of ordinary functions such as walking, driving, writing, reading or working, whether under normal light or artificial light. The use of my invention does not interfere with binocular vision.
The single red corneal contact lens of this invention can be made so as to incorporate a desired refractive correction, or it can be used with a spectacle lens having the correction for that same eye or the refractive correction can be divided between the contact lens and the spectacle lens. The other eye, not covered with a red contact lens, can have required refractive correction in the form of a conventional contact lens or spectacle lens or both.
For example, a color deficient person who is without refractive error but requires reading glasses (spectacle lenses), as in presbyopia could use reading glasses in conjunction with the single red corneal contact lens of this invention. For color deficient persons with binocular refractive errors, the other eye can have a conventional corrective corneal contact lens I have found by experimentation that thickness is a factor which limits the utility of a colored contact lens made in accordance with this invention. Thus, if the eye requires correction, the resultant contact lens may be so thick as to be overly dark for effective use. Accordingly, in such a case, a single red contact lens having no correction would be used in conjunction with a spectacle lens having the desired refractive correction. in this manner, the red contact lens may be kept thin enough to permit sufficient visual acuity. in general, the acuity should be at least 20/40 so that stereopsis is not lost. I have further found that the amount of light absorption by the contact lens of this invention also has an efiect on its utility. Thus, if the lens absorbs more than approximately 86 percent of the light, that is to say has light transmission of less than approximately 14 percent, binocular vision is affected. Further, if the amount of light absorption is less than approximately 60 percent, that is to say the transmission is higher than about 40 percent, color discrimination ability begins to decrease. These percentages might be better understood if one notes that a plain contact lens has about 10 percent loss or 90 percent transmission, while a lightly tinted lens has about 30 percent absorption or 70 percent transmission.
Although the corneal contact lens of this invention can be made from a variety of materials, I prefer to use clear transparent plastic materials such as the polymethacrylate resin group. An example of such a resin which I have found useful is polymethylmethacrylate.
It is noted that the red contact lens of this invention is used monocularly. Thus, the uncovered" eye receives a colordeficient image while the lens-covered eye receives an image which is differently shaded. The individual goes through a brief self-learning process in the true color. Thus, for example, the typical color discrimination deficient person cannot tell green from brown. From experiments with my patients, I have determined that with my invention the person sees green darker and brown lighter.
The uncovered" eye is an important factor in this invention, since it receives certain colors correctly which are obscured in the eye covered with the single red contact lens. I have found that each eye compensates for the disability of the other by a process which is a form of rectinal rival," a phenomenon of the visual mechanism.
Although the single red corneal contact lens of this invention can be used generally with persons deficient in color discrimination, there are certain contra-indicators. Thus, the lens of this invention should not be used where there is corneal pathology such as keratitis or where there are other diseases of the eye wherein the use of conventional corneal contact lenses are contra-indicated. Further, the single corneal contact lens of this invention would not be expected to improve color perception in persons who have amblyopia, strabismus or monocular vision.
SPECIFIC EXAMPLE OF INVENTION In one example of my invention, a contact lens was used which was made of red polymethacrylate. The lens had a radius of 8.23 mm, a diameter of 9.0 mm. and a thickness of 0.23 mm. lt had a peripheral bevel of ll.00/0.3, a secondary curve of 9.00/07 and an optic zone of 8.00. The lens transmitted substantially only in the red zone with practically no transmission below about 590 millimicrons, a peak at about 624 millimicrons, a range of about 590 to 700 millimicrons and an absorption of about 86 percent.
l fitted a patient with this single red contact lens in only one eye, namely his nondominant eye, leaving the dominant eye with no lens or uncovered. The patient indicated that he could now clearly study and decode color bands on resistors at a normal reading distance with average illumination and distinguish among red, brown and green. Prior to this time, although he had good visual acuity, he had always been colorblind and in particular completely unable to distinguish between red and green with, for example, brown looking like green and the various shades of red, as for example pink, appearing grey.
When the patient did not wear the lens, he reverted back to his original colorblind state but when he wore the lens, he always had this new ability to distinguish among red, brown and green. The lens did not in any way interfere with the patient's mobility and enabled him to continue to work at his job.
I wish to make it clear that while my experiments have shown that a single thin red colored corneal lens applied to one eye with the other eye uncovered will produce a practical, useful and substantial improvement in the' ability of a colorblind person to improve his color discrimination, the use of two such lenses, one in each eye, does not produce this desired effect but instead distorts colors, such as orange.
1 wish to also point out that a spectacle lens made of the same material as the corneal contact lens of this invention cannot be used as a substitute for the corneal contact lens, First, it would be exceedingly difficult to fabricate a spectacle lens of the same material and thickness because such a lens of, for example, 0.23 mm. thickness would be exceedingly fragile and difficult to form with accuracy. Even if such a spectacle lens were used in place ofa corneal contact lens, it would provide significantly smaller improvement in color discrimination. When such a spectacle lens was made of the same material but of a minimum thickness to make it feasible, as for example, 0.5 mm., the images were blurred and the colors less distinguishable than without any lens. I have further found that when such spectacle lenses were used for both eyes, overall vision was seriously impaired and certain colors were distorted such as orange.
I claim:
1. A method for improving color discrimination in a person deficient in color discrimination comprising the step of applying to one eye only a thin corneal contact lens transmitting light substantially only in the red zone and having between approximately l4 and 40 percent light transmission and substantially no transmission below approximately 590 millimicrons, the other eye being left uncovered except for the optional use of a spectacle lens, conventional corneal contact lens, or a combination thereof to provide a desired refractive correction for that eye.
2. The method of claim 1 wherein a spectacle lens having a desired refractive correction is used in conjunction with said red contact lens.
3. The method of claim 1 wherein said red lens is made of a polymethacrylate resin and has a thickness of approximately 0.23 millimeters.
Claims (3)
1. A method for improving color discrimination in a person deficient in color discrimination comprising the step of applying to one eye only a thin corneal contact lens transmitting light substantially only in the red zone and having between approximately 14 and 40 percent light transmission and substantially no transmission below approximately 590 millimicrons, the other eye being left uncovered except for the optional use of a spectacle lens, conventional corneal contact lens, or a combination thereof to provide a desired refractive correction for that eye.
2. The method of claim 1 wherein a spectacle lens having a desired refractive correction is used in conjunction with said red contact lens.
3. The method of claim 1 wherein said red lens is made of a polymethacrylate resin and has a thickness of approximately 0.23 millimeters.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US4958270A | 1970-06-24 | 1970-06-24 |
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US3586423A true US3586423A (en) | 1971-06-22 |
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US49582A Expired - Lifetime US3586423A (en) | 1970-06-24 | 1970-06-24 | Method of improving color discrimination |
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Cited By (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4960934A (en) * | 1972-10-04 | 1974-06-13 | ||
US4102567A (en) * | 1976-09-13 | 1978-07-25 | American Optical Corporation | Material for fabrication of artificial intraocular lenses and hard contact lenses |
US4300819A (en) * | 1979-11-07 | 1981-11-17 | Taylor Donald E | Eyeglasses for aiding color blind viewers |
EP0204347A2 (en) * | 1985-06-07 | 1986-12-10 | Firma Carl Zeiss | Contact lens coloured in certain areas |
GB2234176A (en) * | 1989-07-18 | 1991-01-30 | Nat Res Dev | Treatment and inhibition of retinopathy of prematurity |
WO1992012451A1 (en) * | 1985-05-06 | 1992-07-23 | X-Chrom Corporation | Contact lens for correction of color blindness |
US5363151A (en) * | 1991-10-03 | 1994-11-08 | Biays Alice De P T | Color correction for improved vision through water and other environments |
US5363152A (en) * | 1992-12-03 | 1994-11-08 | Reed Iii Clurin B | Selective color enhancement optical glasses |
US5617154A (en) * | 1994-10-28 | 1997-04-01 | Flexlens | Light filtering contact lens |
WO1998025173A1 (en) * | 1996-12-04 | 1998-06-11 | David Andrew Harris | Improving colour discrimination |
US5774202A (en) * | 1993-08-18 | 1998-06-30 | Coloryte Hungary Optikai Kutato, Fejleszto Es Gyarto Reszvenytarsasag | Method and optical means for improving or modifying color vision and method for making said optical means |
US5846457A (en) * | 1994-10-28 | 1998-12-08 | Hoffman; William C. | Light filtering contact lens method |
US5917573A (en) * | 1997-11-26 | 1999-06-29 | Davis; James Kenneth | Optical device for aiding color-blind persons in distinguishing colored objects |
US6132044A (en) * | 1998-11-20 | 2000-10-17 | Luxottica Leasing S.P.A | Filter for a special purpose lens and method of making filter |
US6811258B1 (en) | 2003-06-23 | 2004-11-02 | Alan H. Grant | Eyeglasses for improved visual contrast using hetero-chromic light filtration |
US20080137030A1 (en) * | 2006-11-03 | 2008-06-12 | Hoffman William C | Optical devices with reduced chromatic aberration |
US20090015786A1 (en) * | 2007-07-13 | 2009-01-15 | David Andrew Harris | Tinted lens and method of making same |
US20110176105A1 (en) * | 2007-07-13 | 2011-07-21 | Chromagen Vision Llc | Method of making and prescribing tinted lenses |
EP2506064A2 (en) | 2011-03-31 | 2012-10-03 | ChromaGen Vision LLC | Method of making and prescribing tinted lenses |
WO2014107591A1 (en) | 2013-01-07 | 2014-07-10 | Nitto Denko Corporation | Method for forming an oxide coated substrate |
US8820923B2 (en) | 2011-08-05 | 2014-09-02 | Nitto Denko Corporation | Optical element for correcting color blindness |
US20140270516A1 (en) * | 2013-03-15 | 2014-09-18 | Show Chwan Memorial Hospital | Image enhancement method for improving color perception of colorblind viewers |
US8931930B2 (en) | 2013-01-29 | 2015-01-13 | Nitto Denko Corporation | Optical element for correcting color blindness |
US9443488B2 (en) | 2014-10-14 | 2016-09-13 | Digital Vision Enhancement Inc | Image transforming vision enhancement device |
US10054803B2 (en) | 2013-01-14 | 2018-08-21 | 3M Innovative Properties Company | Filters to enhance color discrimination for color vision deficient individuals |
CN109228424A (en) * | 2018-08-21 | 2019-01-18 | 镇江熙文电子商务有限公司 | A kind of eyeglass preparation method for colour blindness and anomalous trichromatism patient |
EP3677951A1 (en) | 2019-01-04 | 2020-07-08 | Nam Gi Min | Color weakness contact lens comprising a micro-pattern having photonic crystal structure |
US10935814B2 (en) | 2017-12-06 | 2021-03-02 | Hue.Ai, LLC | Optical device for enhancing human color vision with improved cosmetic appearance |
US11513367B2 (en) | 2019-04-24 | 2022-11-29 | Tectus Corporation | Contact lenses with oxygen-impermeable optical filters |
-
1970
- 1970-06-24 US US49582A patent/US3586423A/en not_active Expired - Lifetime
Cited By (44)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4960934A (en) * | 1972-10-04 | 1974-06-13 | ||
US4102567A (en) * | 1976-09-13 | 1978-07-25 | American Optical Corporation | Material for fabrication of artificial intraocular lenses and hard contact lenses |
US4300819A (en) * | 1979-11-07 | 1981-11-17 | Taylor Donald E | Eyeglasses for aiding color blind viewers |
WO1992012451A1 (en) * | 1985-05-06 | 1992-07-23 | X-Chrom Corporation | Contact lens for correction of color blindness |
EP0204347A2 (en) * | 1985-06-07 | 1986-12-10 | Firma Carl Zeiss | Contact lens coloured in certain areas |
EP0204347A3 (en) * | 1985-06-07 | 1988-09-21 | Firma Carl Zeiss | Contact lens coloured in certain areas |
GB2234176A (en) * | 1989-07-18 | 1991-01-30 | Nat Res Dev | Treatment and inhibition of retinopathy of prematurity |
GB2234176B (en) * | 1989-07-18 | 1994-01-19 | Nat Res Dev | Treatment and inhibition of retinopathy of prematurity |
US5363151A (en) * | 1991-10-03 | 1994-11-08 | Biays Alice De P T | Color correction for improved vision through water and other environments |
US5363152A (en) * | 1992-12-03 | 1994-11-08 | Reed Iii Clurin B | Selective color enhancement optical glasses |
US5774202A (en) * | 1993-08-18 | 1998-06-30 | Coloryte Hungary Optikai Kutato, Fejleszto Es Gyarto Reszvenytarsasag | Method and optical means for improving or modifying color vision and method for making said optical means |
US5617154A (en) * | 1994-10-28 | 1997-04-01 | Flexlens | Light filtering contact lens |
US5846457A (en) * | 1994-10-28 | 1998-12-08 | Hoffman; William C. | Light filtering contact lens method |
WO1998025173A1 (en) * | 1996-12-04 | 1998-06-11 | David Andrew Harris | Improving colour discrimination |
US5917573A (en) * | 1997-11-26 | 1999-06-29 | Davis; James Kenneth | Optical device for aiding color-blind persons in distinguishing colored objects |
US6132044A (en) * | 1998-11-20 | 2000-10-17 | Luxottica Leasing S.P.A | Filter for a special purpose lens and method of making filter |
US6811258B1 (en) | 2003-06-23 | 2004-11-02 | Alan H. Grant | Eyeglasses for improved visual contrast using hetero-chromic light filtration |
US20080137030A1 (en) * | 2006-11-03 | 2008-06-12 | Hoffman William C | Optical devices with reduced chromatic aberration |
US8414127B2 (en) | 2007-07-13 | 2013-04-09 | Chromagen Vision Llc | Method of making and prescribing tinted lenses |
US7931369B2 (en) | 2007-07-13 | 2011-04-26 | David Andrew Harris | Tinted lens and method of making same |
US20110176105A1 (en) * | 2007-07-13 | 2011-07-21 | Chromagen Vision Llc | Method of making and prescribing tinted lenses |
US9028064B2 (en) | 2007-07-13 | 2015-05-12 | Chromagen Vision Llc | Method of making and prescribing tinted lenses |
US20090015786A1 (en) * | 2007-07-13 | 2009-01-15 | David Andrew Harris | Tinted lens and method of making same |
EP2506064A2 (en) | 2011-03-31 | 2012-10-03 | ChromaGen Vision LLC | Method of making and prescribing tinted lenses |
US8820923B2 (en) | 2011-08-05 | 2014-09-02 | Nitto Denko Corporation | Optical element for correcting color blindness |
US9574067B2 (en) | 2011-08-05 | 2017-02-21 | Nitto Denko Corporation | Optical element for correcting color blindness |
US8845095B2 (en) | 2011-08-05 | 2014-09-30 | Nitto Denko Corporation | Optical element for correcting color blindness |
US8939576B2 (en) | 2011-08-05 | 2015-01-27 | Nitto Denko Corporation | Optical element for correcting color blindness |
US8963104B2 (en) | 2011-08-05 | 2015-02-24 | Nitto Denko Corporation | Optical element for correcting color blindness |
US10119070B2 (en) | 2011-08-05 | 2018-11-06 | Nitto Denko Corporation | Optical element for correcting color blindness |
US9022562B2 (en) | 2011-08-05 | 2015-05-05 | Nitto Denko Corporation | Optical element for correcting color blindness |
WO2014107591A1 (en) | 2013-01-07 | 2014-07-10 | Nitto Denko Corporation | Method for forming an oxide coated substrate |
US10054803B2 (en) | 2013-01-14 | 2018-08-21 | 3M Innovative Properties Company | Filters to enhance color discrimination for color vision deficient individuals |
US8931930B2 (en) | 2013-01-29 | 2015-01-13 | Nitto Denko Corporation | Optical element for correcting color blindness |
US20140270516A1 (en) * | 2013-03-15 | 2014-09-18 | Show Chwan Memorial Hospital | Image enhancement method for improving color perception of colorblind viewers |
US8977051B2 (en) * | 2013-03-15 | 2015-03-10 | Show Chwan Memorial Hospital | Image enhancement method for improving color perception of colorblind viewers |
US9443488B2 (en) | 2014-10-14 | 2016-09-13 | Digital Vision Enhancement Inc | Image transforming vision enhancement device |
US10373583B2 (en) | 2014-10-14 | 2019-08-06 | Digital Vision Enhancement Inc. | Image transforming vision enhancement device |
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