Which statement connects high diopter power corrections and base curve specification?

• A. They are unrelated
• B. High diopter power corrections may require a base curve specification
• C. They only apply to contact lenses
• D. They only apply to tinted lenses

Answer: (B)

High diopter corrections affect how a contact lens must sit on the eye, not just the amount of refractive power. The base curve is the back-surface curvature of the lens that determines how tightly and where the lens rests on the cornea. When prescriptions are large, the fit becomes more sensitive: the lens needs an appropriate base curve to stay centered, avoid edge lift, and provide a stable optical zone. Specifying a base curve helps ensure the lens aligns properly with the eye while delivering the intended correction. It’s not about tint or about glasses—base curve is a fitting parameter for contact lenses, and higher powers often prompt clinicians to specify or adjust it to achieve both comfort and accurate vision.