Do gas permeable contact lenses conform to the shape of the eye?

Do gas permeable contact lenses conform to the shape of the eye?

• A. Yes
• B. Sometimes
• C. Only after wearing
• D. No

Answer: (D)

Gas permeable lenses are rigid and keep their own shape on the eye rather than molding to every contour of the ocular surface. When worn, a thin tear layer sits between the back surface of the lens and the cornea, and the lens vaults over the cornea, resting on a stable fit defined by the lens’s curvature and diameter. Because of this rigidity, the lens does not conform to the eye’s shape the way soft lenses do; it provides its corrective power from its fixed shape while still allowing oxygen through the material. So the best answer is that they do not conform to the shape of the eye.

Gas permeable lenses are rigid and keep their own shape on the eye rather than molding to every contour of the ocular surface. When worn, a thin tear layer sits between the back surface of the lens and the cornea, and the lens vaults over the cornea, resting on a stable fit defined by the lens’s curvature and diameter. Because of this rigidity, the lens does not conform to the eye’s shape the way soft lenses do; it provides its corrective power from its fixed shape while still allowing oxygen through the material. So the best answer is that they do not conform to the shape of the eye.