COLOR-VISION AND DARK-ADAPTATION IN HIGH MYOPIA WITHOUT CENTRAL RETINAL DEGENERATION

Colour vision and dark adaptation of 36 high myopes (68 eyes) without degenerative fundus changes were studied with the standard pseudoisoch romatic plates part 2, Farnsworth-Munsell 100 hue (FM 100) test, Nagel anomaloscope, colour vision meter 712-anomaloscope, and Goldmann-Week ers adaptometer. The ages of the myopes ranged from 20 to 49 years, th e visual acuity from 6/12 to 6/6, and the refractions hom -6.0 to -20. 0 D. All the colour vision tests and dark adaptation examination gave normal results. However, the error scores of the myopes in (blue) box III of the FM 100 test were significantly higher than those of the con trols matched for age. In dark adaptation, the rod thresholds of the m yopes were significantly higher than in the controls. The stretching o f the posterior pole of the eye might explain this minimal impairment of the photoreceptor layer of the retina without any visible degenerat ive changes in the fundus.