Gas Permeable Contact Lenses – Introduction Practice Test

What factor should be monitored during follow-up for GP lenses?

Scratches or warpage on the lens surface. Eye color changes. Lens brand popularity. Replacement interval only.

Correct Answer:

Scratches or warpage on the lens surface.

Explanation:

The key idea is to check the lens itself for physical defects that can affect comfort, vision, and corneal health. Scratches on the GP lens surface can irritate the cornea, disrupt the tear film, trap deposits, and cause fluctuating vision. Warpage changes the lens’s shape, altering the fit and the refractive effect, which can lead to poor centration, uneven vision, or corneal staining. Because these surface or shape issues directly impact how the lens functions during wear, they’re the most important factor to monitor at follow-up. Eye color changes, brand popularity, or simply following a replacement schedule don’t reflect the ongoing performance or safety of the lens itself during wear.

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