The optimal position where an observer's eye should be placed to view through an optical instrument like a microscope or telescope with the best image.
Compound of 'eye' and 'point' (from Old French 'pointe'). Technical term from optics, standardized in the 20th century.
Finding the eyepoint is like finding the 'sweet spot'—move your eye even a millimeter and the image blurs, so optical designers engineer a precise 3D zone for perfect viewing.
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