2017
DOI: 10.1515/prolas-2017-0059
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Effect of Cycloplegia on Blur Perception Thresholds as Measured by Source Method

Abstract: One of the advantages of a source method over observer method in blur perception measurements is better control of a stimulus blur level, which is achieved with computerised image processing unlike the observer method that requires optical defocusing of the observer. The aim of this study was to determine if paralysation of accommodation has effect on blur perception thresholds, thereby evaluating its necessity in such experiments. Blur perception thresholds (just noticeable blur, clear image, recognition, and… Show more

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“…Optical blur from defocus is often considered as equivalent to low-pass filtering (e.g., McAnany, Alexander, Lim, & Shahidi, 2011 ; Meinecke & Kehrer, 2007 ; Petrova, Žanete, Cikmačs, & Kassaliete, 2017 ; Wood, 1983 ). Yet that belief, although not entirely wrong, is inaccurate.…”
Section: Introductionmentioning
confidence: 99%
“…Optical blur from defocus is often considered as equivalent to low-pass filtering (e.g., McAnany, Alexander, Lim, & Shahidi, 2011 ; Meinecke & Kehrer, 2007 ; Petrova, Žanete, Cikmačs, & Kassaliete, 2017 ; Wood, 1983 ). Yet that belief, although not entirely wrong, is inaccurate.…”
Section: Introductionmentioning
confidence: 99%