In soft lens terminology, what does the abbreviation BC stand for?

In soft lens terminology, what does the abbreviation BC stand for?

• A. Base Curve
• B. Back Curve
• C. Binocular Convergence
• D. Break Curve

Answer: (A)

Base Curve is the curvature of the lens’s back surface that sits on the cornea. This parameter determines how closely the lens fits the eye: a steeper base curve (more curved) fits more tightly, while a flatter base curve fits more loosely. The abbreviation BC is the standard shorthand for this important fitting measure, usually given in millimeters (for example, 8.4 or 8.7). The other options aren’t correct because they aren’t the term used in soft lens fitting: “Back Curve” isn’t the accepted label, and the other two options refer to concepts outside lens curvature or are not used in this context.

Base Curve is the curvature of the lens’s back surface that sits on the cornea. This parameter determines how closely the lens fits the eye: a steeper base curve (more curved) fits more tightly, while a flatter base curve fits more loosely. The abbreviation BC is the standard shorthand for this important fitting measure, usually given in millimeters (for example, 8.4 or 8.7). The other options aren’t correct because they aren’t the term used in soft lens fitting: “Back Curve” isn’t the accepted label, and the other two options refer to concepts outside lens curvature or are not used in this context.