When the base curve is expressed in radius (mm), a higher number indicates what?

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Multiple Choice

When the base curve is expressed in radius (mm), a higher number indicates what?

Explanation:
Base curve radius measures the back-surface curvature of a gas-permeable lens. When this value is given in millimeters, increasing the number means the curve is less steep, i.e., flatter. A larger radius creates a gentler, flatter back surface, which is why a higher number corresponds to a flatter fit. Conversely, a smaller radius makes the back surface steeper and tighter to the cornea. So, the higher the radius, the flatter the curve.

Base curve radius measures the back-surface curvature of a gas-permeable lens. When this value is given in millimeters, increasing the number means the curve is less steep, i.e., flatter. A larger radius creates a gentler, flatter back surface, which is why a higher number corresponds to a flatter fit. Conversely, a smaller radius makes the back surface steeper and tighter to the cornea. So, the higher the radius, the flatter the curve.

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