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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 ).
Contact lenses, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used by over 150 million people worldwide, [ 1 ] and they can be worn to correct vision or for cosmetic or therapeutic reasons. [ 2 ]
Clearly is an online retailer of contact lenses, eyeglasses and sunglasses headquartered in Vancouver, British Columbia. The company, founded in 2000, is a subsidiary of the French lens manufacturer Essilor, which acquired it in 2014.
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Adding a carbon copy (Cc) and/or blind carbon copy (Bcc) to your email is a great way to loop-in contacts that aren't your email's main audience but still need to have the info. Both Cc and Bcc will forward a copy of the message to those listed but Bcc is used for contacts that you want to hide. No one sees who's in the Bcc list beside you. 1.
The base curve (usually determined from the profile of the front surface of an ophthalmic lens) can be changed to result in the best optic and cosmetic characteristics across the entire surface of the lens. Optometrists may choose to specify a particular base curve when prescribing a corrective lens for either of these reasons. A multitude of ...
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