In keratometry-based base curve values, a lower value indicates the curve is

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Multiple Choice

In keratometry-based base curve values, a lower value indicates the curve is

Explanation:
The key idea is how keratometry expresses curvature. Keratometry values describe how curved the cornea is in diopters, and diopters are inversely related to the radius of curvature. A higher diopter reading means a smaller radius and a steeper curve; a lower diopter reading means a larger radius and a flatter curve. When base curve values are derived from keratometry, a lower keratometry-based base curve value corresponds to a flatter posterior surface because it reflects the larger radius of curvature. In short, lower diopter-based BC values indicate flatter curvature, while higher values indicate steeper curvature.

The key idea is how keratometry expresses curvature. Keratometry values describe how curved the cornea is in diopters, and diopters are inversely related to the radius of curvature. A higher diopter reading means a smaller radius and a steeper curve; a lower diopter reading means a larger radius and a flatter curve. When base curve values are derived from keratometry, a lower keratometry-based base curve value corresponds to a flatter posterior surface because it reflects the larger radius of curvature. In short, lower diopter-based BC values indicate flatter curvature, while higher values indicate steeper curvature.

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