Changes in monochromatic aberrations during accommodation
Purpose: The monochromatic aberrations of the human eye are known to vary considerably between individuals. However little is known about the similarity in monochromatic aberrations between the right and left eyes of an individual and how the aberrations in both eyes change as a function of accommodation level.
Methods: The effect of accommodation on the nature and magnitude of monochromatic aberrations was studied using the aberroscope technique. The aberrations were measured in single dioptre steps of accommodation up to the subject's maximum amplitude of accommodation and were recorded in both eyes of eleven young subjects.
Results: The longitudinal spherical aberration of the subjects because progressively more negative in power with increasing accommodation (p=0.0001). The aberration data showed a trend towards a higher mean-square-error of the wavefront (p=0.06) with increasing accommodation levels. The third-order components of the aberrations were found to be of greater magnitude than fourth-order components (about 4:1 for a 5mm pupil). There was substantial correlation in the magnitude and sign of the spherical aberration present in the fellow eyes of individuals, however other components of the wavefront showed little correlation between fellow eyes. There was little general correlation between fellow eyes in the third-order components (eg. Zernike C7 (lateral coma) or C8 (vertical coma) coefficients) of the wavefront.
Conclusions: The significant trend toward higher negative spherical aberration with increasing accommodation levels was confirmed in this study and shown to continue at high levels of accommodation. The monochromatic aberrations of fellow eyes showed greatest similarity for spherical aberration, however little systematic correlation was evident between fellow eyes for third-order components of the wavefront.
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|Item Type:||Journal Article|
|Additional Information:||For more information, please refer to the journal’s website (see hypertext link) or contact the author.|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)|
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Vision Science (111303)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Optical Technology (111302)
|Divisions:||Current > Research Centres > Centre for Health Research|
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
|Copyright Owner:||Copyright 1999 Association for Research in Vision and Ophthalmology|
|Deposited On:||25 Jan 2008|
|Last Modified:||22 Apr 2010 03:18|
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