Colors do look different after a lens implant!

Granville, Walter C.

doi:10.1002/col.5080150110

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…Following removal of these cataractous lenses, there is a substantial increase in shorter visible-wavelength light reaching the retina and patients often report large shifts in color. For example, Granville (1990) reported in a case study that following surgery the morning sky was a more saturated violet-blue and whites acquired a violet tinge.…”

Section: Introductionmentioning

confidence: 99%

Long-term renormalization of chromatic mechanisms following cataract surgery

et al. 2004

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The optical density of the human crystalline lens progressively increases with age, the greatest increase in the visible spectrum being at short wavelengths. This produces a gradual shift in the spectral distribution of the light reaching the retina, yet color appearance remains relatively stable across the life span, implying that the visual system adapts to compensate for changes in spectral sensitivity. We explored properties of this adaptive renormalization by measuring changes in color appearance following cataract surgery. When the lens is removed, cataract patients often report a large perceptual shift in color appearance that can last for months. This change in color appearance was quantified for four cataract patients (63-84 years) by determining the chromaticity of stimuli that appeared achromatic before surgery, and at various intervals after surgery for up to 1 year. Stimuli were presented on a calibrated CRT as 9.5-deg spots, with 3-s duration and 3-s interstimulus intervals (ISIs). Chromaticity was adjusted by the subjects in CIE L * a * b * color space with luminance fixed at 32 cd0m 2 , on a dark background. We also estimated the optical density of the cataractous lens by comparing absolute scotopic thresholds from 410 nm to 600 nm before and after surgery. The results demonstrated that immediately following surgery there is a large increase in the short-wave light reaching the retina, mainly below 500 nm. The achromatic settings generally showed an initial large shift in the "yellow" direction after surgery that gradually (but never fully) returned to the original achromatic point before surgery. The shifts in the achromatic point occur over a number of months and appear to occur independently of the fellow eye.

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Section: Introductionmentioning

confidence: 99%

Long-term renormalization of chromatic mechanisms following cataract surgery

et al. 2004

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“…[1][2][3][4][5] An emphasis was always placed on violet, blue, green, and white perception. For examples, one felt that there was a tendency to rake out blue from object colors in a scene, 1 another noticed that the greenish color of gas jets on the kitchen range was a more violet hue and more saturated, 3 the person with an operated eye was surprised to see people wore very saturated blue clothes, 4 and a fluorescent lamp changed to white from orange. 5 Obama et al 5 asked 48 patients, whose one eye was already operated and the other eye was before operation, about their visual perception before and after the operation.…”

Section: Introductionmentioning

confidence: 99%

Desaturation of color by environment light in cataract eyes

Ikeda

Obama

2008

Color Research & Application

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The visual perception of the cataract eyes is composed of three elements, color, brightness, and haze. The color element is related to the reduced transmittance of light at short wavelengths of crystalline lens, the brightness element to the reduced transmittance at entire region of wavelength, and the haze element to the opacity of the crystalline lens. Researchers pay attention to only the color and brightness elements when they discuss on the color perception by the cataract eyes. We will show in this article that the haze element is also related to the color perception. There exists always environment light in our living situation. Light comes to the eyes from every direction. When the light enters the cataract eye it is scattered by the opacity of the crystalline lens and overlaps on the retinal image of objects that the eye is looking at. The environment light is usually white in color, and it reduces the colorimetric purity of the objects. The color appearance of the objects desaturates. This purity change was confirmed colorimetrically by measuring colors of test patches with the cataract simulating goggles placed in front of the lens of a colorimeter. The desaturation was then confirmed psychophysically by subjects wearing the goggles, who matched two color patches with and without the goggles. The same experiment was done by a subject whose right eye was operated for the cataract and the left eye was before the operation. Desaturation of color was found, though the desaturation was not as strong as with the goggles. In another psychophysical experiment the subject did the heterochromatic brightness matching experiment by using his right eye and left eye, respectively, before and after operation. The results were interpreted that all the color patches presented were perceived as being less saturated by eyes having cataracts. The importance was pointed out that, when we do experiments on the color perception by elderly observers we should not neglect the effect of the environment light.

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Letter to the editor

Granville

1990

Color Research & Application

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Colors do look different after a lens implant!

Cited by 5 publications

References 3 publications

Long-term renormalization of chromatic mechanisms following cataract surgery

Long-term renormalization of chromatic mechanisms following cataract surgery

Desaturation of color by environment light in cataract eyes

Letter to the editor

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