The medical process or technique of measuring the visual field of the eye to detect areas of vision loss or abnormalities.
From Latin campus (field) plus Greek metria (measurement), literally 'field measurement.' This medical term became standard in the 19th century as systematic eye testing developed.
Campimetry is how doctors discovered that glaucoma steals your vision from the edges inward—people don't notice because the brain ignores the missing edges, so campimetry catches the disease before someone realizes they can't see!
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