A measuring or testing system related to optical images or visual perception; the measurement of visual acuity or image clarity.
From Greek 'eidos' (image) and 'optometry' (measurement of vision/light), combining two technical terms to describe the assessment of how clearly someone sees or perceives images.
Eidoptometry bridges philosophy and practical eye testing—it asks both 'how clearly does light form images in your eye?' and 'how well does your brain interpret those images?'—making it weirdly relevant to understanding optical illusions.
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