[Posterior embryotoxon in ichthyosis].

Slit-lamp examinations were conducted in 17 patients with X-linked inchtyosis, 11 female carriers, and 9 patients with ichthyosis vulgaris. All patients with ichthyosis were under 21 years of age. Dystrophic alterations reported in the literature were lacking in all cases. In all 3 groups (X-ichthyosis, carriers and ichthyosis vulgaris) a posterior embryotoxon arc was observed with a higher frequency than in controls. This arc was always localized at 3 and/or 9 hours in the cornea periphery. The high incidence of posterior embryotoxon was statistically significant (X2 . 6,51) only for patients with X-linked ichthyosis.