Bifocal lenses have two sections that are separated by a line, where the upper part of the lens is used for distance vision and the lower section is for near vision.Those who are prescribed progressive glasses, can use bifocal glasses instead, and vice versa.
CR-39 lens, which is a type of plastic, is the most popular type of lens due to its low cost, light weight, and yet high optical quality. In terms of optical quality, it ranks below Polycarbonate lens, but above high-index lens.
Also known as Multifocal, progressive lenses provide a smooth transition from near correction to distance correction while eliminating segment lines that are present in bifocal lenses. Those who are prescribed bifocal glasses, can use progressive glasses instead, and vice versa.
If your prescription does not mention progressive or bifocal, this is the type of lens you will need. This type of lens corrects for one distance, as opposed to bifocal or progressive lenses that allow for both distance and near vision. If your lens mentions "progressive" or "bifocal", you cannot use this type of lens instead.
Transition lenses, also known as Photochromic lenses, are the type of lenses that darken in the sunlight and lighten in softer light or in the dark. With this type of lens you can save money since you do not need to buy a separate prescription sunglasses for sunny conditions; the transition lens provides best of both worlds. Moreover, our transition…