Gas Permeable Contact Lenses Practice Test 2026 – The Complete Guide to Mastering Your Exam!

The lipid layer’s main job is to slow evaporation of the underlying aqueous tear layer. When a gas-permeable lens sits on the eye, evaporation can quickly thin the tear film beneath it, leading to dryness, surface irregularities, and uncomfortable sensations. By forming a barrier to evaporation, the lipid layer helps keep the tear film thicker and more uniform under the lens. That stability translates into a smoother lens surface, less friction with the eyelids, and a more comfortable wear overall. A stable tear film also allows tears to stay and refresh more effectively with blinking, supporting comfort and clearer vision. The other statements don’t fit because the lipid layer does not increase evaporation, it does affect tear film stability, and it’s not about eye color.