system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Critical angle of air corneal interface -
assistant
The correct answer is  Criticalangle for the cornea-air interface is approximately 46 degrees. Total internal reflection prevents direct visualization of ang le in nearly all eyes. Ref khurana 6/e