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by ptrask on April 11th, 2007

ptrask

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What is the difference between an 8.6 Base Curve (BC) and a 8.8 BC contact lens?

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  • by audiogal on April 11th, 2007

    audiogal

    The base curve is the radius of the sphere that the back of the contact lens describes. One just has a bit more curve to it (you probably can't notice much difference looking at it, but your eye can tell the difference).

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    • So is this the same idea for regular glasses? And what's the units (centimeters?)

      Stableboy

      by Stableboy on April 30th, 2007

    • Base curve is measured in millimeters.

      Eyeglass prescriptions are a bit different: The first number is the spherical refractive error in diopters (negative for nearsighted, positive for farsighted). Spherical errors occur when the optical power of the eye is either too large or too small to focus light on the retina.

      The second number is the astigmatism (if no astigmatism, it is usually notated by "DS" or "SPH". The final number is the direction of the astigmatism.

      audiogal

      by audiogal on April 30th, 2007

    • Ok, last of our bonus questions: is there anything you DON'T know?!

      Stableboy

      by Stableboy on May 1st, 2007

    • lol ;)

      audiogal

      by audiogal on May 1st, 2007

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