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.
Multifocal and single vision eyeglass lenses available for presbyopia correction include: 1  Bifocals. Traditional bifocals have a clearly defined zone in the top half of the lens for distance vision and a zone for near vision in the bottom half of the lens. 2  Trifocals.