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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. Windsor glasses - Wikipedia

   en.wikipedia.org/wiki/Windsor_glasses

   The minimalist nature of Windsor glasses presents some pragmatic advantages over other styles.. Glasses that have eyerims with a particular customised shape may be subject to vendor lock-in, where the only company able to manufacture new lenses for a given frame is the same company from which that frame was purchased.

4. Glasses - Wikipedia

   en.wikipedia.org/wiki/Glasses

   Man with glasses. A woman with glasses. Glasses, also known as eyeglasses or spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears for support.

5. The perfect pair of sunglasses for your face shape - AOL

   www.aol.com/lifestyle/perfect-pair-sunglasses...

   With all the different styles to choose from, how do you pick the one that's right for your face shape?

6. Sunglasses - Wikipedia

   en.wikipedia.org/wiki/Sunglasses

   Frames can be made to hold the lenses in several different ways. There are three common styles: full frame, half frame, and frameless. Full frame glasses have the frame go all around the lenses. Half frames go around only half the lens; typically the frames attach to the top of the lenses and on the side near the top.

7. Lensmeter - Wikipedia

   en.wikipedia.org/wiki/Lensmeter

   It is mainly used by optometrists and opticians to measure the back or front vertex power of a spectacle lens and verify the correct prescription in a pair of eyeglasses, to properly orient and mark uncut lenses, and to confirm the correct mounting of lenses in spectacle frames.