posterior embryotoxon

embryotoxon /em·bryo·tox·on/ (em″bre-o-tok´son) a ringlike opacity at the margin of the cornea.

---

anterior embryotoxon  embryotoxon.

posterior embryotoxon  a developmental anomaly in which there is a ringlike opacity at Schwalbe's ring, with thickening and anterior displacement of the latter; it is seen in Axenfeld's syndrome and Rieger's syndrome.

---

posterior embryotoxon

n.

A congenital defect of the eye characterized by an enlarged anterior limiting ring.

---

embryotoxon, posterior

A condition in which a thickened and anteriorly displaced Schwalbe's line is visible on external examination. The condition is inherited as an autosomal dominant trait. See gonioscopy; anterior limiting ring of Schwalbe; Alagille syndrome; Rieger's syndrome.