First Author: M.Shimmyo UNITED STATES
Co Author(s): A. Gruener X. Chen
Purpose:
Significant number of men and a few women suffer from color perception deficiencies, but there have not been satisfactory treatments available. A new diagnostic device and customized color corrective lenses have been devised and tested for a large number of color deficient individuals. This is to report the logic behind the new devises and to report the successful experience with them.
Setting:
: 300 dyschromatic individuals in a clinic in Shenyang, China in study 1 and, 10,266 men out of 205,266 military services candidates in study 2 were identified as color deficient and fitted with color corrective lenses chosen by computerized anomaloscope.
Methods:
A new computerized anomaloscope was devised for assessing color perception deficiencies and fitting of color perception corrective lenses were refined with computer technology. This is based on the discovery that many dyschromatic persons possess normal functions of at least 2 cones out of 3 and an attenuated function of the third to different degrees. By suppressing the sensitivities of the spectrum of color perceived by two strong cones by filtering off the intensity of such spectra of color, the resultant mixture of color perceived by the individual will be balanced and approximate the mixture of the light perceived by normal individuals. By measuring the color sensitivity of the individual precisely by newly developed computerized spectral curvature analysis machine, spectral characteristic of the filters is determined to suppress wavelength of stronger spectra by the computers based on mathematical simulation to reverse the errors. By the use of colored filters to reduce the intensity of certain light, a normalized mixture of light spectrum can be created.
Results:
As a result of the preliminary project in 1991, new type of lenses was tested for 300 achromatic individuals and performances of these lenses were evaluated with 24 page color vision testing book and computerized spectral curvature analysis machine in study 1. 300 patients tested were corrected by these 4 types (A, B, C, D) of lenses out of 32 combinations of specified color penetration rates with spectral penetration rate defined above. 85% of the subjects were corrected with Type A and Type B lenses. In study 2, out of 205,266 male candidates for military services tested for color perception in Shenyang district in Peoples Republic of China between January and May, 2005, 10,266 individuals or 5.0% were identified as color perception deficient.
Conclusions:
Color perception analyses of patients by computerized color spectral curvature analysis machine and customization of color spectrum correcting lenses enabled 300 patients using 4 types of corrective lenses and 32 combinations of specified color penetration rates. These new lenses chosen by color spectral analyses and color penetration rates were found to be effective in color perception deficiencies in study 1. However, monochromacy cannot be corrected by this technique.
Financial Disclosure:
... has significant investment interest in a company producing, developing or supplying product or procedure presented
