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Symmetries in peripheral ocular aberrations
Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences. (Vision Enabling Lab)ORCID iD: 0000-0002-3745-0035
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2011 (English)In: Journal of Modern Optics, ISSN 0950-0340, E-ISSN 1362-3044, Vol. 58, no 19-20 SI, p. 1690-1695Article in journal (Refereed) Published
Abstract [en]

A mirror symmetry in the aberrations between the left and right eyes has previously been found foveally, but while a similar symmetry for the peripheral visual field is likely, it has not been investigated. Nevertheless, the peripheral optical quality is often evaluated in only one eye, because it is more time efficient than analyzing the whole visual field of both eyes. This study investigates the correctness of such an approach by measuring the peripheral wavefront aberrations in both eyes of 22 subjects out to +/- 40 degrees horizontally. The largest aberrations (defocus, astigmatism, and coma) were found to be significantly correlated between the left and right eyes when comparing the same temporal or nasal angle. The slope of the regression line was close to +/- 1 (within 0.05) for these aberrations, with a negative slope for the horizontally odd aberrations, i.e. the left and right eyes are mirror symmetric. These findings justify that the average result, sampled in one of the two eyes of many subjects, can be generalized to the other eye as well.

Place, publisher, year, edition, pages
2011. Vol. 58, no 19-20 SI, p. 1690-1695
National Category
Medical and Health Sciences
Research subject
Natural Science, Optometry
Identifiers
URN: urn:nbn:se:lnu:diva-11156DOI: 10.1080/09500340.2011.564317Scopus ID: 2-s2.0-84856927274OAI: oai:DiVA.org:lnu-11156DiVA, id: diva2:404646
Available from: 2011-03-17 Created: 2011-03-17 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Optimal Use of Peripheral Vision
Open this publication in new window or tab >>Optimal Use of Peripheral Vision
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

People who lose their central vision have to rely on their peripheral vision for all visual tasks. The ability to resolve fine details in the periphery is reduced due to retinal limitations and the optical aberrations arising from the use of off-axis vision. The aim of this work is to improve vision by enhancing the image quality at the preferred retinal locus by means of correcting the optical errors. The focus of this thesis has been to measure and correct peripheral optical errors, as well as to evaluate their impact on resolution acuity in both normal and central visual field loss subjects.

 In order to measure peripheral optics we employed a COAS HD VR open view aberrometer which is based on the Hartmann-Shack principle. Psychophysical methods were used to evaluate peripheral grating resolution acuity. We assessed the repeatability of the wavefront sensor in measuring the peripheral ocular aberrations. The symmetry of peripheral ocular aberrations between the left and right eyes was examined. The influence of age on peripheral ocular aberrations was also investigated. We evaluated peripheral vision with sphero-cylindrical correction in healthy eyes and performed the first adaptive optics aberration correction at the preferred retinal locus of a single central visual field loss subject.

 We found that the aberrometer was repeatable and reliable in measuring peripheral ocular aberrations. There was mirror symmetry between the two eyes for most of the peripheral aberration coefficients. Age had a significant influence on peripheral ocular aberrations; there were larger amounts of higher-order aberrations in old eyes than in young eyes. Peripheral low contrast resolution acuity improved with peripheral refractive correction in subjects who had higher amounts of off-axis astigmatism. Finally, adaptive optics aberration correction improved both high and low contrast resolution acuity measured at the preferred retinal locus of the single low vision subject.

 Because of their versatility, open view aberrometers will hopefully be a standard clinical instrument at low vision clinics as they allow for measurements to be rapidly performed at any location in the visual field. The existence of off-axis astigmatism should be better communicated within the low-vision rehabilitation community. Currently, the off-axis refractive errors can be corrected with conventional methods and we hope that the higher-order aberrations can also be corrected in a more realistic ways in the future.  

 In conclusion, this thesis has shown that peripheral visual function can be improved by optical correction. The findings of this thesis have broadened the knowledge of peripheral optical errors and their influence on vision.

Place, publisher, year, edition, pages
Kalmar, Växjö: Linnaeus University Press, 2012. p. 62
Series
Linnaeus University Dissertations ; 108/2012
Keywords
off-axis refractive errors, peripheral aberrations, aberrometers, central visual field loss, preferred retinal locus, eccentric viewing, absolute central scotoma, adaptive optics, eccentric correction.
National Category
Ophthalmology
Research subject
Natural Science, Optometry
Identifiers
urn:nbn:se:lnu:diva-22562 (URN)9789186983949 (ISBN)
Public defence
2012-12-20, N2007, Smålandsgatan 26E, Kalmar, 10:00 (English)
Opponent
Supervisors
Available from: 2012-11-23 Created: 2012-11-21 Last updated: 2018-02-28Bibliographically approved

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Publisher's full textScopushttp://www.informaworld.com/10.1080/09500340.2011.564317

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Baskaran, KarthikeyanGustafsson, Jörgen

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