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single focus lens

[Single focus lens/single vision]

Single vision eyeglass lenses are lenses that have one correction function in one lens. It is used to correct eyesight close to emmetropia (an eye with normal vision) for people with nearsightedness, farsightedness, or astigmatism. It is also used to correct presbyopia when viewing up close.
In eyes with emmetropia, eyes with nearsightedness, farsightedness, and astigmatism, presbyopia gradually develops as you reach your 40s. Single-focal eyeglass lenses for presbyopia primarily correct vision at hand and do not allow for far vision.

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