The practice and science of measuring focal properties of optical systems; equivalent to 'focimetry.'
From 'focus' + '-metry' (from Greek 'metria'). An alternative term to 'focimetry' with the same meaning, following standard Greek-derived scientific naming patterns.
In technical fields, you often see alternative terms like 'focimetry' vs 'focometry'—both perfectly valid, but one gets adopted by textbooks and becomes standard while the other becomes a footnote in history.
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