If there is a decrease in the radius of base curve, the contact lens will be flatter/steeper.

If there is a decrease in the radius of base curve, the contact lens will be flatter/steeper.

• A. Flatter
• B. Steeper
• C. Unchanged
• D. Not predictable

Answer: (B)

Base curve radius determines how curved the lens’ inner surface is. A smaller radius makes the inner surface curve more tightly, which makes the lens fit on the eye in a steeper way. So when the radius of the base curve decreases, the lens becomes steeper. Conversely, a larger radius yields a flatter fit. The other options don’t fit because they imply the lens would either be flatter, unchanged, or that the outcome is unpredictable, contradicting the direct relationship between base curve radius and lens curvature.

Base curve radius determines how curved the lens’ inner surface is. A smaller radius makes the inner surface curve more tightly, which makes the lens fit on the eye in a steeper way. So when the radius of the base curve decreases, the lens becomes steeper. Conversely, a larger radius yields a flatter fit. The other options don’t fit because they imply the lens would either be flatter, unchanged, or that the outcome is unpredictable, contradicting the direct relationship between base curve radius and lens curvature.