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Eye (Lond). 1995;9 ( Pt 1):130-5.

Colour vision and side-effects during treatment with methazolamide.

Author information

1
Department of Ophthalmology, University of Uppsala, Sweden.

Abstract

The retina contains Na+K(+)-ATPase and carbonic anhydrase (CA), enzymes that regulate ion fluxes across cell membranes of photoreceptors. Since inhibition of retinal Na+K(+)-ATPase by digitalis impairs colour vision, we wanted to find out whether this also occurs after inhibition of CA. In a double-masked cross-over study with placebo, 14 male volunteers were given 50 mg q.i.d. of the CA inhibitor methazolamide for 2 weeks. A disturbance of colour discrimination was observed in 8 of the 14 subjects, in the classification phase of Lanthony New Color Test. The presence of the disturbance was not significantly correlated to the degree of acidosis or to other side-effects. Its mechanism could be interpreted as a specific effect of CA inhibition in the retina (or the visual cortex) calculated to more than 99.9%.

PMID:
7713242
DOI:
10.1038/eye.1995.22
[Indexed for MEDLINE]

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