Which statement best describes how UV blockers function in GP lenses?

Which statement best describes how UV blockers function in GP lenses?

• A. They block UV rays
• B. They increase lens thickness
• C. They reduce oxygen permeability
• D. They color-tint the lens

Answer: (A)

UV blockers in GP lenses filter ultraviolet radiation by absorbing UV photons as light passes through the lens, reducing the amount that reaches the cornea and intraocular structures. This protective action happens without requiring noticeable changes in lens thickness, and when designed well, it preserves the lens’s oxygen permeability so the eye continues to receive adequate oxygen. The blockers are intended to keep the lens clear in appearance, so tinting isn’t the primary function. In short, their job is to block UV rays to protect eye tissues.

UV blockers in GP lenses filter ultraviolet radiation by absorbing UV photons as light passes through the lens, reducing the amount that reaches the cornea and intraocular structures. This protective action happens without requiring noticeable changes in lens thickness, and when designed well, it preserves the lens’s oxygen permeability so the eye continues to receive adequate oxygen. The blockers are intended to keep the lens clear in appearance, so tinting isn’t the primary function. In short, their job is to block UV rays to protect eye tissues.