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  2. Base curve radius - Wikipedia

    en.wikipedia.org/wiki/Base_curve_radius

    Base curve radius (BCR) or simply base curve (BC) is the measure of an important parameter of a lens in optometry. On a spectacle lens, it is the flatter curvature of the front surface. On a contact lens it is the curvature of the back surface and is sometimes referred to as the back central optic radius (BCOR). Typical values for a contact ...

  3. Radius of curvature (optics) - Wikipedia

    en.wikipedia.org/wiki/Radius_of_curvature_(optics)

    Radius of curvature sign convention for optical design. Radius of curvature (ROC) has specific meaning and sign convention in optical design.A spherical lens or mirror surface has a center of curvature located either along or decentered from the system local optical axis.

  4. Contact lens - Wikipedia

    en.wikipedia.org/wiki/Contact_lens

    As of 2010, the average age of contact lens wearers globally was 31 years old, and two-thirds of wearers were female. [4] People choose to wear contact lenses for many reasons. [5] Aesthetics and cosmetics are main motivating factors for people who want to avoid wearing glasses or to change the appearance or color of their eyes. [6]

  5. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    Thus the base curve defines the front surface of the main part of the lens while the back surface geometry is changed to achieve the desired distance power. The "bifocal" is a third spherical segment, called an add segment , found on the front surface of the lens.

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  7. “Today I Learned”: 97 Interesting And Weird Facts To Satisfy ...

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    It cost an estimated $60 million dollars. 25 painters a day for 18 months straight. ... now preacher known as General Butt Naked. He led the Naked Base Commandos, comprised of child soldiers, to ...

  8. Average cost - Wikipedia

    en.wikipedia.org/wiki/Average_cost

    1. The Average Fixed Cost curve (AFC) starts from a height and goes on declining continuously as production increases. 2. The Average Variable Cost curve, Average Cost curve and the Marginal Cost curve start from a height, reach the minimum points, then rise sharply and continuously. 3. The Average Fixed Cost curve approaches zero asymptotically.

  9. BCOR - Wikipedia

    en.wikipedia.org/wiki/BCOR

    Back central optic radius, an alternative term for the base curve radius of a contact lens; The human gene BCOR that encodes the BCL-6 corepressor protein

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