Adaptation To Interocular Differences In Blur

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Adaptation To Interocular Differences In Blur

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Author : Elysse Jil Kompaniez-Dunigan
language : en
Publisher:
Release Date : 2012

Adaptation To Interocular Differences In Blur written by Elysse Jil Kompaniez-Dunigan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Thesis categories.

Adaptation to a blurred image causes a physically focused image to appear too sharp, and shifts the point of subjective focus toward the adapting blur, consistent with a renormalization of perceived focus. We examined whether and how this adaptation normalizes to differences in blur between the two eyes, which can routinely arise from differences in refractive errors. Observers adapted to images that were isotropically blurred or sharpened by varying the slope of the amplitude spectrum, or to oriented blur in images filtered to simulate different levels and axes of astigmatism. Adaptation to both types of blur produced strong aftereffects that showed strong transfer across the eyes. Greater transfer was found for the isotropic blur than for the oriented blur, both in a monocular adaptation task and in a contingent adaptation task in which the two eyes were simultaneously exposed to different blur levels. These contingent aftereffects were more robust for the astigmatic blur. When one eye was exposed to a sharper image than the other, the aftereffects instead showed little interocular difference and were strongly dominated by the sharper image. Our results suggest that while short term adaptation can rapidly recalibrate the perception of blur, it cannot do so independently for the two eyes, and that the binocular adaptation of blur is determined largely by the sharper of the two eye's retinal images.

Handbook Of Visual Optics Volume Two

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Author : Pablo Artal
language : en
Publisher: CRC Press
Release Date : 2017-02-24

Handbook Of Visual Optics Volume Two written by Pablo Artal and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-02-24 with Medical categories.

Handbook of Visual Optics offers an authoritative overview of encyclopedic knowledge in the field of physiological optics. It builds from fundamental concepts to the science and technology of instruments and practical procedures of vision correction, integrating expert knowledge from physics, medicine, biology, psychology, and engineering. The chapters comprehensively cover all aspects of modern study and practice, from optical principles and optics of the eye and retina to novel ophthalmic tools for imaging and visual testing, devices and techniques for visual correction, and the relationship between ocular optics and visual perception.

The Spatial And Temporal Characteristics Of Blur Adaptation

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Author : Vidhya Subramanian
language : en
Publisher:
Release Date : 2009

The Spatial And Temporal Characteristics Of Blur Adaptation written by Vidhya Subramanian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Contrast sensitivity (Vision) categories.

Abstract: The reduction in visual resolution due to visual blur is a common experience, especially when individuals requiring eyewear remove their spectacles or contact lenses. However, studies have shown that when one looks continually at a visual acuity chart through blur, the smallest letters that one can read at first are not as small as the letters that one can read several minutes later. This improvement in sensitivity following a period of exposure to blur is referred to as blur adaptation. The purpose of this dissertation is to evaluate the temporal and spatial aspects of blur adaptation. Ten subjects were enrolled in each of the three visual acuity studies. The temporal characteristics were assessed, firstly, by varying the initial blur exposure duration (0min, 1min, 5min and 15min exposures) to a natural scene image. Visual acuity measured using a short 1.5min and a long 10min computer-based letter presentations, using Bailey-Lovie optotypes, was the outcome measure. Secondly, the influence of varying letter exposure durations was tested using three letter presentation times (2sec, 4sec and 15sec exposure per letter). The spatial characteristics of adaptation were assessed by adapting to a blurred natural scene, visual acuity chart, and different sets of alphabets presented in large and small sizes. A fourth study, carried out on one subject, looked at the effects of blur adaptation on the contrast sensitivity function. It was seen that visual acuity was not influenced by the four initial blur exposure durations to the natural scene. Also, adaptation to stimuli with various spatial characteristics like a natural scene, acuity chart, and letters of varying sizes did not result in different acuity scores. However, there was a significant influence of test letter presentation duration. Acuity was better with long acuity presentation times compared to short presentation times. The acuity score from the 15sec per letter presentation was better than those from 2sec per letter and 4sec per letter presentations. Interestingly, blur adaptation did not significantly influence contrast sensitivity. Thus this work suggests that blur adaptation is not driven by spatial features but may be due to temporal summation effects.

Handbook Of Visual Optics Two Volume Set

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Author : Pablo Artal
language : en
Publisher: CRC Press
Release Date : 2017-06-27

Handbook Of Visual Optics Two Volume Set written by Pablo Artal and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-06-27 with Medical categories.

Handbook of Visual Optics offers an authoritative overview of encyclopedic knowledge in the field of physiological optics. It builds from fundamental concepts to the science and technology of instruments and practical procedures of vision correction, integrating expert knowledge from physics, medicine, biology, psychology, and engineering. The chapters comprehensively cover all aspects of modern study and practice, from optical principles and optics of the eye and retina to novel ophthalmic tools for imaging and visual testing, devices and techniques for visual correction, and the relationship between ocular optics and visual perception.

The Effect Of Blur Adaptation On Contrast Sensitivity

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Author : Vidhya Subramanian
language : en
Publisher:
Release Date : 2004

The Effect Of Blur Adaptation On Contrast Sensitivity written by Vidhya Subramanian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

Presbyopia Research

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Author : Gerard Obrecht
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29

Presbyopia Research written by Gerard Obrecht and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-29 with Medical categories.

Seeing is life. Seeing is transfonning luminous col We wish to extend our academic and theoretical ored stimulations and shapes into amental represen knowledge and also to complete and exchange our tation, structured in space and in time. But seeing is technical and professional experience to prepare also opening onto the world that surrounds us: it is corrective means for the future. thus a means for communicating and learning. Numerous questions have yet to be answered, Jean-Jacques Rousseau, a philosopher worth such as: quoting during the bicentennial of the French Revo lution of which he was an instigator, stated, "of all • Will it one day be possible to defer or stop the the senses, vision is that wh ich can be the least aging of the accommodative apparatus? readily separated from judgments of the mind. " • Is further improvement of the current corrective Sight is increasingly called on in our modern means possible, whether spectacles or contact world. Maturity is affected at about 40-45 years by lenses? the on set of presbyopia. Atthat age, which demands • How are behavioral and psychological presbyope all our intellectual and physical means, our sight typologies to be integrated in the course of exam should be irreproachable. Our efficiency must not be ination, prescription, and fitting with corrective diminished.

Blur Adaptation And Visual Acuity

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Author : Michael F. Fry
language : en
Publisher:
Release Date : 2004

Blur Adaptation And Visual Acuity written by Michael F. Fry and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Contrast sensitivity (Vision) categories.

The Interocular Supression Of Uniocular Gaussian Blur Is Local

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Author : Dharmendra Jithendra Bhoola
language : en
Publisher:
Release Date : 2000

The Interocular Supression Of Uniocular Gaussian Blur Is Local written by Dharmendra Jithendra Bhoola and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.

Effect Of Brief Periods Of Clear Vision On Blur Adaptation

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Author : Joan K. Portello
language : en
Publisher:
Release Date : 2008

Effect Of Brief Periods Of Clear Vision On Blur Adaptation written by Joan K. Portello and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Eye categories.

Perceiving In Depth Volume 2

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Author : Ian P. Howard
language : en
Publisher: OUP USA
Release Date : 2012-02-24

Perceiving In Depth Volume 2 written by Ian P. Howard and has been published by OUP USA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-02-24 with Medical categories.

Volume 2 addresses stereoscopic vision. It starts with the physiology of stereoscopic mechanisms. It then deals with binocular rivalry, binocular summation, and interocular transfer. A review of how images are brought into binocular register is followed by a review of stimulus tokens used to detect disparities. Cyclopean effects, such as cyclopean illusions, cyclopean motion, texture segregation, and binocular direction are reviewed. Factors that influence stereoacuity are discussed. Two chapters describe how stimuli in distinct depth planes produce contrast effects, and affect motion perception and whiteness perception. The Pulfrich stereomotion effect and perception of motion in depth are reviewed. The volume ends with a review of applications of stereoscopy.