“…In other fields, several authors in the past have hypothesized that tritanopia was associated with a predisposition to alcoholism and might even be used as a marker thereof [Cruz-Coke, 1965;Cruz-Coke and Varela, 1966;Varela et al, 1969;Sassoon et al, 1970;Ugarte et al, 1970;Adams, 1977], Thus, it may be suggested that tritanopia is an etiological heterogeneous disease inherited in some families, but that environmental con ditions such as retinal or optic nerve disease as well as alcoholism or other drug addictions may lead to phenocopies.…”