A medical or optical condition involving the perception or viewing of something together or from a shared perspective (a rare or specialized term in optics/medicine).
From co- (together) plus Greek 'opsis' (seeing/vision). This appears to be a rare or specialized medical term, though it may be archaic or used in very specific optical contexts.
This is a genuinely obscure term—even most medical dictionaries barely mention it—but it represents the older tradition of naming vision conditions with Greek-based terminology, a practice that continues with words like 'myopia' and 'diplopia.'
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