What Is Bozd

Black optic. zone diameter (BOZD) Total diameter (TD) (FOZD)

What does Ortho K do?

Orthokeratology, or ortho-K, is the process of fitting special contact lenses to reshape the cornea. Ortho-K uses gas-permeable contact lenses designed to be worn overnight rather than during the day. While the patient sleeps, the lenses gently and gradually reshape the surface of the eye.

How is BOZR calculated?

BOZR=Kf (mm) – [1/3 astigmatism (mm)] Proposed by Bausch & Lomb to fit their keratoconus lens design or OP8 GP lens (Soflex, Israel).