visual acuity
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eyesightvisionvisual impairmentblindnesseyeretinafoveamaculacornealenspupilirisoptic nervephotoreceptorconerodresolutionsharpnessclarityfocusperceptionsightopticsophthalmologyoptometryopticianmyopiahyperopiaastigmatismpresbyopiacataractglaucomamacular degenerationdiopterglassesspectaclescontact lensrefractionaccommodationcontrastluminancebrightnessblind spotperipheral visiondepth perceptionstereopsisvisual fieldaccommodateblurdistortmagnifyexaminescreendiagnosetreatcorrectsurgerylightphotonwavelengthspectrumimagedetailprecisionsensitivitythresholdacuityvisualizeobservescandetect