Congenital and acquired colour vision deficiencies current ophthalmology monographs jan 22 2020 posted by zane grey publishing text id 083a03c9 online pdf ebook epub library code acquired colour vision deficiencies can occur in the course of an ocular or systemic disease or as a side effect of medication or chemical exposure congenital color. Acquired colour vision deficiencies similar to congenital or inherited colour deficiencies acquired cvds can also be classified as type 1 or type 2 red green deficiencies and type 3 blue yellow colour deficiency 1 type 1 exhibits protan deficiency characteristics with an altered protan spectral luminosity function in which the wavelength of maximum sensitivity is shifted towards shorter . Acquired color vision deficiency by contrast may demon strate progression or regression may affect one eye or both eyes asymmetrically and may affect only a portion of the vi sual field in contrast to congenital color vision deficiency acquired color vision deficiency is believed to be highly. Colour vision deficiency may be congenital or acquired congenital colour defects are non pathologic incurable and constant throughout life it is the commonest x linked recessive disorder and affects as many as 8 of males and 05 of females . Color vision defects from disease are less understood than congenital color vision problems disease specific color blindness often affects both eyes differently and the color vision defect usually gets worse over time acquired color vision loss can be the result of damage to the retina or optic nerve
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