Single Vision
Single vision lenses are prescribed if you need correction for one field of vision: either for distance, intermediate (computer), or items up close (near vision). Single vision has the same optical focal point or correction over the entire area of the lens.
Progressive
Progressive lenses continuously increase in power as you look through lower portions of the lenses. In general, the top is for looking at distant objects, middle is for computer use, and bottom is for reading. There is no visible line as compared with traditional bifocals or trifocals.
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