Certified Ophthalmic Technician (COT) Practice Test 2026 - Free COT Practice Questions and Study Guide

A contact lens fit is defined as "steeper than K" when the curvature of the lens is steeper than that of the cornea. The term "K" refers to the keratometry measurements of the cornea. In this context, "steeper than K" means that the radius of curvature of the contact lens is somehow less than the radius of curvature of the cornea, which results in a tighter fit on the eye.

This aspect of lens fitting is crucial because when the lens is steeper than the cornea, it can provide a more stable fit, is less likely to move on the eye, and can help with better tear exchange under the lens. This also plays a role in ensuring adequate centration of the lens over the pupil, which is important for optimal vision and comfort.

Understanding the relationship between the corneal measurements and the lens curvature is vital in the fitting process, as it influences how the lens will perform during wear. Other options do not accurately describe this relationship, such as stating that the lens is flatter than the cornea or equal to it, which would not constitute a "steeper than K" fit and could lead to various complications like discomfort or compromised vision.