In GP lens terminology, what does BC stand for?

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Multiple Choice

In GP lens terminology, what does BC stand for?

Explanation:
In GP lens terminology, BC stands for Base Curve—the radius of the lens’s back surface that sits on the tear film over the cornea. This parameter is the cornerstone of fitting because it directly determines how closely the lens hugs the corneal shape. A base curve that’s too flat will sit more loosely, move too much, and may not align well with the cornea; a base curve that’s too steep will grip the eye too tightly, reducing movement and comfort. The base curve sets up the initial alignment, tear exchange, and lens centration, which in turn influence both comfort and the optical performance of the lens. While there are other terms that sound similar in engineering or broader terminology, they don’t describe the fitting geometry of a GP lens the way base curve does.

In GP lens terminology, BC stands for Base Curve—the radius of the lens’s back surface that sits on the tear film over the cornea. This parameter is the cornerstone of fitting because it directly determines how closely the lens hugs the corneal shape. A base curve that’s too flat will sit more loosely, move too much, and may not align well with the cornea; a base curve that’s too steep will grip the eye too tightly, reducing movement and comfort. The base curve sets up the initial alignment, tear exchange, and lens centration, which in turn influence both comfort and the optical performance of the lens. While there are other terms that sound similar in engineering or broader terminology, they don’t describe the fitting geometry of a GP lens the way base curve does.

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