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diopter movement: The adjustment of the eyepiece of an instrument to provide accommodation for the eyesight differences of individual observers. The axial distance through which the eyepiece must be moved, to provide a convergence or divergence of one diopter, is calculated from the focal length of the eyepiece. One diopter (D) = F²/1000 where F = eyepiece effective focal length (EFL) in mm.

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