Short Sight (Minus) - Replaceable Optical Lenses range from -1.0 to -8.0 (in .5 diopter increments). Lenses are interchangeable and will fit either the left or the right side.
Long Sight (Plus) - Replaceable Optical Lenses range from +1.5 to +4.0 (in .5 diopter increments). Lenses are interchangeable and will fit either the left or the right side.
Reading Lenses - Add-on Bi-Focus lenses are magnifiers that are bonded to plain lenses and range from +1.0, +2.0 and +3.0. These have a left and right side.
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