8 Depth of focus is related to pupil size. 7 A limitation of very small pupils can be diffraction however, this problem is less significant than the aberrations in larger pupil sizes as demonstrated by Howland and Howland. A larger pupil will allow more peripheral rays into the eye, resulting in high-order monochromatic aberrations that pose a problem with image quality when the PD is large. 5, 6ĭiameter of the pupil (PD) is another component of the eye that is measured and is related to image quality. IPD is measured using the distance between the centers of the pupils. 4 Furthermore, normative IPD data is important in the optical industry when fitting patients for glasses. Distance between the pupils, called interpupillary distance (IPD), is an important clinical measure used to identify potential vision issues such as stereo acuity, 1 near point convergence, 2 accommodation, 3 and other vision-related issues.
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