Effect of third-order aberrations on dynamic accommodation
López-Gil, Norberto, Rucker, Frances J., Stark, Lawrence R., Badar, Mustanser, Borgovan, Theodore, Burke, Sean, & Kruger, Philip B. (2007) Effect of third-order aberrations on dynamic accommodation. Vision Research, 47(6), pp. 755-765.
We investigate the potential for the third-order aberrations coma and trefoil to provide a signed cue to accommodation. It is first demonstrated theoretically (with some assumptions) that the point spread function is insensitive to the sign of spherical defocus in the presence of odd-order aberrations. In an experimental investigation, the accommodation response to a sinusoidal change in vergence (1–3 D, 0.2 Hz) of a monochromatic stimulus was obtained with a dynamic infrared optometer. Measurements were obtained in 10 young visually normal individuals with and without custom contact lenses that induced low and high values of r.m.s. trefoil (0.25, 1.03 μm) and coma (0.34, 0.94 μm). Despite variation between subjects, we did not find any statistically significant increase or decrease in the accommodative gain for low levels of trefoil and coma, although effects approached or reached significance for the high levels of trefoil and coma. Theoretical and experimental results indicate that the presence of Zernike third-order aberrations on the eye does not seem to play a crucial role in the dynamics of the accommodation response.
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|Item Type:||Journal Article|
|Keywords:||Contact Lens, Accommodation, Monochromatic Aberrations|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Vision Science (111303)|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health|
Current > Schools > School of Optometry & Vision Science
|Deposited On:||01 Jul 2009 10:36|
|Last Modified:||11 Aug 2011 03:10|
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