FTN â **** the Navy. Commonly used as graffiti in hard to find places as a type of game. While there are no clear objectives, the result of upsetting officers constitutes a type of victory.
Bifocals, are eyeglasses with two distinct optical powers, Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and/or astigmatism.
1 This is the most commonly used lens for bifocal and multifocal lenses. 2  With a concentric bifocal pattern contact lens, the near correction is located in a small circle at the center of the lens and is surrounded by a larger circle that contains the distance correction.here are many different types of bifocal and multifocal lenses available on the market that correct different types of vision disorders. Multifocal and bifocal contact lenses are very similar to their glasses counterparts.