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  • Eyeglasses designed with two corrective (i.e., graduated) lenses mounted in a frame that holds them in an appropriate position before the eyes to assist vision (i.e., vision aids). The lenses are usually graduated to improve the visual acuity of the user (e.g., to correct myopia, presbyopia); they may be configured as monofocal, bifocal, trifocal, or progressive. Dedicated corrective lens eyeglasses that incorporate a set of telescopic lenses intended to correct the vision when the use of standard lenses is not appropriate are also available.
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