$Front view vintage manual mechanical phoropter, optical medical device used by optometrists to determine patient refractive errors, placed on concrete surface of garden well roof.$

front view vintage manual mechanical phoropter, optical medical device used by optometrists

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Author: dreamstime
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adjustment afternoon astigmatism autumn chrome concrete cylinder determine device errors examination front garden gauge horizontal hypermetropia knob knobs lenses manual mechanical medical metal myopia optical optician optics optometrists patient phoropter refraction refractive roof scale sphere sunlight sunshine surface tool undefined used view vintage