When evaluating surface quality, what should you look for on a GP lens?

When evaluating surface quality, what should you look for on a GP lens?

• A. Scratches, cracking/crazing, deposits, film
• B. Color changes only
• C. Edge distortion only
• D. Center thickness variations

Answer: (A)

When checking surface quality on a GP lens, focus on the actual surface integrity and cleanliness because those factors directly affect vision and comfort. Scratches and cracking or crazing create physical irregularities that scatter light and can irritate the eye, while deposits and films from proteins, lipids, or minerals dull the surface, disrupt wettability, and degrade tear film stability. These surface issues are what most influence optics and wearer comfort. Color changes can signal staining or dehydration, but they don’t consistently reflect surface condition. Edge distortion concerns the lens edge geometry and fit rather than the surface itself. Center thickness variation relates to the lens design and overall optics, not the surface quality.

When checking surface quality on a GP lens, focus on the actual surface integrity and cleanliness because those factors directly affect vision and comfort. Scratches and cracking or crazing create physical irregularities that scatter light and can irritate the eye, while deposits and films from proteins, lipids, or minerals dull the surface, disrupt wettability, and degrade tear film stability. These surface issues are what most influence optics and wearer comfort.

Color changes can signal staining or dehydration, but they don’t consistently reflect surface condition. Edge distortion concerns the lens edge geometry and fit rather than the surface itself. Center thickness variation relates to the lens design and overall optics, not the surface quality.