What are Bifocals?
Bifocal are eyeglass lenses. A bifocal lens is created with two different areas of vision correction, which are divided by a distinct line that sits horizontally across the lens. The top portion of the lens is used for distance, while the bottom portion of the lens is used for closer vision.
A regular type of bifocals is flat-top. Also known as the "D" style mutli-focal lens, this type of lens has an a magnifying area on the lower part of the lens that resembles a letter D turned on its side, with the flat side up. Lenses with flat top design provides a good transition between reading and distance vision.
I have one of this type of eye glasses with flat top and for me the D design is technically better with a lesser image jump. Its not as smooth but has a comfortable transition between a distance and near vision
If you're a 40-something who has trouble reading fine print you can get one of this. Just have you eyes check and your on your way to onto a brighter and clearer vision.
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Bifocal Eyeglasses Wiki
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.. bifocal glass, bifocals, bifocal lens, bifocal eyeglasses, bifocal reading glasses, bifocal lenses explained,