Single vision lenses are used to correct myopia, hyperopia and astigmatism. They can be tinted or clear.Transitions lenses are recommended to protect your eyes from the harmful wave lengths of the sun.
Bifocals lenses are used to correct presbyopia. The lens is split into two sections. The upper most part is used for seeing in the distance and the lower part is for near vision.
Trifocal lenses have three points of focus-usually for distance, intermediate and near
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