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Off-axis wave front measurements for optical correction in eccentric viewing

Lundström, Linda; Unsbo, Peter and Gustafsson, Jörgen LU (2005) In Journal of Biomedical Optics 10(3).
Abstract
In a previous study we have shown that correction of peripheral refractive errors can improve the remaining vision of subjects with large central visual field loss. Measuring peripheral refractive errors with traditional methods is often difficult due to low visual acuity and large aberrations. Therefore a Hartmann-Shack sensor has been designed to measure peripheral wave front aberrations in subjects using eccentric viewing. The sensor incorporates an eye tracker and analyzing software designed to handle large wave front aberrations and elliptic pupils. To ensure that the measurement axis is aligned with the direction of the subject's preferred retinal location, a special fixation target has been developed. It consists of concentric rings... (More)
In a previous study we have shown that correction of peripheral refractive errors can improve the remaining vision of subjects with large central visual field loss. Measuring peripheral refractive errors with traditional methods is often difficult due to low visual acuity and large aberrations. Therefore a Hartmann-Shack sensor has been designed to measure peripheral wave front aberrations in subjects using eccentric viewing. The sensor incorporates an eye tracker and analyzing software designed to handle large wave front aberrations and elliptic pupils. To ensure that the measurement axis is aligned with the direction of the subject's preferred retinal location, a special fixation target has been developed. It consists of concentric rings surrounding the aperture of the sensor together with a central fixation mark along the measurement axis. Some initial measurements on subjects using eccentric viewing have been performed successfully. As a first step in improving the peripheral optics of the eye, the wave front has been used to calculate the eccentric refraction. This refraction has been compared to the refraction found with the Power-Refractor instrument. Measuring the off-axis wave front is a fast way to assess the optical errors in the subject's eccentric viewing angle and to better understand the problems of eccentric correction. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
eccentric refraction, PowerRefractor, central visual field loss, preferred, eccentric viewing, Strehl ratio, retinal location, Hartmann-Shack sensor, peripheral wave front aberrations, vision, Certec
in
Journal of Biomedical Optics
volume
10
issue
3
publisher
Published by SPIE--the International Society for Optical Engineering in cooperation with International Biomedical Optics Society
external identifiers
  • wos:000235127400022
ISSN
1083-3668
DOI
10.1117/1.1920587
language
English
LU publication?
yes
id
2495cd96-795d-4931-9fc2-0cf19fda5607 (old id 209456)
alternative location
http://spiedl.aip.org/getabs/servlet/getabsservlet?prog=normal&id=jbopfo000010000003034002000001&idtype=cvips&gifs=yes
date added to LUP
2007-08-21 08:47:28
date last changed
2016-09-20 04:47:31
@article{2495cd96-795d-4931-9fc2-0cf19fda5607,
  abstract     = {In a previous study we have shown that correction of peripheral refractive errors can improve the remaining vision of subjects with large central visual field loss. Measuring peripheral refractive errors with traditional methods is often difficult due to low visual acuity and large aberrations. Therefore a Hartmann-Shack sensor has been designed to measure peripheral wave front aberrations in subjects using eccentric viewing. The sensor incorporates an eye tracker and analyzing software designed to handle large wave front aberrations and elliptic pupils. To ensure that the measurement axis is aligned with the direction of the subject's preferred retinal location, a special fixation target has been developed. It consists of concentric rings surrounding the aperture of the sensor together with a central fixation mark along the measurement axis. Some initial measurements on subjects using eccentric viewing have been performed successfully. As a first step in improving the peripheral optics of the eye, the wave front has been used to calculate the eccentric refraction. This refraction has been compared to the refraction found with the Power-Refractor instrument. Measuring the off-axis wave front is a fast way to assess the optical errors in the subject's eccentric viewing angle and to better understand the problems of eccentric correction.},
  author       = {Lundström, Linda and Unsbo, Peter and Gustafsson, Jörgen},
  issn         = {1083-3668},
  keyword      = {eccentric refraction,PowerRefractor,central visual field loss,preferred,eccentric viewing,Strehl ratio,retinal location,Hartmann-Shack sensor,peripheral wave front aberrations,vision,Certec},
  language     = {eng},
  number       = {3},
  publisher    = {Published by SPIE--the International Society for Optical Engineering in cooperation with International Biomedical Optics Society},
  series       = {Journal of Biomedical Optics},
  title        = {Off-axis wave front measurements for optical correction in eccentric viewing},
  url          = {http://dx.doi.org/10.1117/1.1920587},
  volume       = {10},
  year         = {2005},
}