The measurement and analysis of the focal properties of optical lenses and systems.
From 'focus' + '-metry' (suffix from Greek 'metria' meaning 'measurement'). Created as a technical term in optical science to describe the practice of measuring focal lengths.
Focimetry is essential in manufacturing eyeglasses and camera lenses—tiny errors in focal measurements can mean the difference between perfect vision and constant squinting, so the field is incredibly precise.
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