Question

How does the hyperopic design with Ortho-K work?

A) By creating a myopic defocus in the periphery
B) By creating a hyperopic defocus in the center
C) Both A and B
D) None of the above

Answer 1

Ortho-K works in hyperopic design by reshaping the cornea to create a myopic defocus in the periphery, which makes the center of the cornea steeper to bring the light rays into focus on the retina.

Step-by-step explanation:

The hyperopic design with Ortho-K works by creating a myopic defocus in the periphery (Option A). Ortho-K, or Orthokeratology, is a non-surgical process that uses specially designed contact lenses to temporarily reshape the contour of the cornea to reduce or correct mild to moderate hyperopia, myopia, and astigmatism. For individuals with hyperopia (farsightedness), where the eye is too short or the corneal curvature is too flat causing light rays to focus behind the retina, Ortho-K lenses are designed to reshape the cornea so that the focal point of light rays is brought forward onto the retina. By creating a myopic defocus in the periphery, the center of the cornea becomes relatively steeper, helping to converge rays more effectively on the retina for clearer vision.