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Repeatability of Peripheral Aberrations in Young Emmetropes
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV. (Vision Enabling Lab)ORCID-id: 0000-0002-3745-0035
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
2010 (engelsk)Inngår i: Optometry and Vision Science, ISSN 1040-5488, E-ISSN 1538-9235, Vol. 87, nr 10, s. 751-759Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

PURPOSE.: The purpose of this study is to assess the intrasession repeatability of ocular aberration measurements in the peripheral visual field with a commercially available Shack-Hartmann aberrometer (complete ophthalmic analysis system-high definition-vision research). The higher-order off-axis aberrations data in young healthy emmetropic eyes are also reported.

METHODS.: The aberrations of the right eye of 18 emmetropes were measured using an aberrometer with an open field of view that allows peripheral measurements. Five repeated measures of ocular aberrations were obtained and assessed in steps of 10 degrees out to +/-40 degrees in the horizontal visual field (nasal + and temporal -) and -20 degrees in the inferior visual field. The coefficient of repeatability, coefficient of variation, and the intraclass correlation coefficient were calculated as a measure of intrasession repeatability.

RESULTS.: In all eccentric angles, the repeatability of the third- and fourth-order aberrations was better than the fifth and sixth order aberrations. The coefficient of variation was <30% and the intraclass correlation coefficient was >0.90 for the third and fourth order but reduced gradually for higher orders. There was no statistical significant difference in variance of total higher-order root mean square between on- and off-axis measurements (p > 0.05). The aberration data in this group of young emmetropes showed that the horizontal coma (C13) was most positive at 40 degrees in the temporal field, decreasing linearly toward negative values with increasing off-axis angle into the nasal field, whereas all other higher-order aberrations showed little or no change.

CONCLUSIONS.: The complete ophthalmic analysis system-high definition-vision research provides fast, repeatable, and valid peripheral aberration measurements and can be used efficiently to measure off-axis aberrations in the peripheral visual field

sted, utgiver, år, opplag, sider
2010. Vol. 87, nr 10, s. 751-759
Emneord [en]
repeatability, off-axis wavefront aberrations, COAS-HD VR aberrometer, peripheral aberrations, visual field
HSV kategori
Forskningsprogram
Naturvetenskap, Optometri
Identifikatorer
URN: urn:nbn:se:lnu:diva-8763DOI: 10.1097/OPX.0b013e3181f36336Scopus ID: 2-s2.0-78049303467OAI: oai:DiVA.org:lnu-8763DiVA, id: diva2:354669
Tilgjengelig fra: 2010-10-04 Laget: 2010-10-04 Sist oppdatert: 2017-12-12bibliografisk kontrollert
Inngår i avhandling
1. Optimal Use of Peripheral Vision
Åpne denne publikasjonen i ny fane eller vindu >>Optimal Use of Peripheral Vision
2012 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Kalmar, Växjö: Linnaeus University Press, 2012. s. 62
Serie
Linnaeus University Dissertations ; 108/2012
Emneord
off-axis refractive errors, peripheral aberrations, aberrometers, central visual field loss, preferred retinal locus, eccentric viewing, absolute central scotoma, adaptive optics, eccentric correction.
HSV kategori
Forskningsprogram
Naturvetenskap, Optometri
Identifikatorer
urn:nbn:se:lnu:diva-22562 (URN)9789186983949 (ISBN)
Disputas
2012-12-20, N2007, Smålandsgatan 26E, Kalmar, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2012-11-23 Laget: 2012-11-21 Sist oppdatert: 2018-02-28bibliografisk kontrollert

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