Posterior Embryotoxon

Posterior Embryotoxon: prominent Schwalbe's line is visible just inside the temporal limbus. 

  • May occur as an isolated finding or as a spectrum of Axenfeld-Rieger's anomaly
  • Occurs in approximately 15% of normal eyes

Clinical features:

  • Thickened or hypertrophied Schwalbe's ring that is anteriorly displaced
  • Visible through a clear cornea as a sharply defined, concentric white line or opacity anterior to the limbus
  • When associated with Axenfeld-Rieger's anomaly, bilateral involvement with multiple bridging peripheral iris strands and iris stromal hypoplasia are characteristic