Blur Unblurred-A Mini Tutorial

I-Perception
Hans StrasburgerSven P Heinrich

Abstract

Optical blur from defocus is quite frequently considered as equivalent to low-pass filtering. Yet that belief, although not entirely wrong, is inaccurate. Here, we wish to disentangle the concepts of dioptric blur, caused by myopia or mis-accommodation, from blur due to low-pass filtering when convolving with a Gaussian kernel. Perhaps surprisingly-if well known in optometry-the representation of a blur kernel (or point-spread function) for dioptric blur is, to a good approximation and disregarding diffraction, simply a cylinder. Its projection onto the retina is classically referred to as a blur circle, the diameter of which can easily be deduced from a light-ray model. We further give the derivation of the relationship between the blur-disk's diameter and the extent of blur in diopters, as well as the diameter's relation to the near or far point, and finally its relationship to visual acuity.

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Citations

Sep 7, 2019·Documenta Ophthalmologica. Advances in Ophthalmology·Sven P Heinrich, Isabell Strübin
Jun 5, 2019·Documenta Ophthalmologica. Advances in Ophthalmology·Jessica Knötzele, Sven P Heinrich
Jun 4, 2020·Documenta Ophthalmologica. Advances in Ophthalmology·Ruth HamiltonDorothy A Thompson
Jul 1, 2020·Journal of Clinical Medicine·Miguel García GarcíaSiegfried Wahl
Jun 4, 2020·I-Perception·Hans Strasburger
Mar 29, 2021·Biological cybernetics·Jan Koenderink
Sep 18, 2021·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Andrew CarkeetYee Teng Goh

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Methods Mentioned

BETA
light-ray

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