Accommodation and spherical aberration
Purpose: The accommodation response to changing levels of
longitudinal spherical aberration (LSA) was measured. The LSA
of the eye is known to change from positive to negative as the
level of accommodation of the eye increases. However, little is
known about the effect of these changes in spherical aberration
on the overall accommododation response.
Methods: The existing monochromatic aberrations of three
young subjects were measured using the objective aberroscope
procedure across a range of accommodation levels. LSA was induced
through the use of aspheric surface, rigid contact lenses
(in-air) positioned over a 5 mm aperture at a distance of 12 mm
from the eye. Seven levels of LSA were induced ranging from
-3 D and +3 D of LSA. The subjects viewed a high contrast Maltese
cross with the right eye at distances of 33 cm and 67 cm in
photopic conditions. Measurements of accom~nodationle vel for
each LSA condition were made from tlie left (occluded) eye using
the Canon Autoref R-1, a free-space objective infra-red optometer.
Results: For the three subjects who were tested, negative LSA
caused an increased accommodation response and positive LSA
a decreased accommodation response. Pooling the data across
subjects and test distances, a linear regression on induced LSA
versus accommodation response gave: Accommodation response
(D) = 0.23 - 0.25 LSA (D) (rz= 0.90). Therefore, for every one
dioptre of LSA, there was approximately 0.25 D of accommodation
response. Some individual variations occurred and there
was some apparent flattening of the slope at the extremes of
Conclusions: These findings suggest that the accommodation
response of the eye will be influenced by the natural changes in
spherical aberration of the eye associated with accommodation
and by optical corrections of the eye which induce spherical aberration.
Citation countsare sourced monthly fromand citation databases.
These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.
Citations counts from theindexing service can be viewed at the linked Google Scholar™ search.
|Item Type:||Journal Article|
|Additional Information:||For more information, please refer to the journal’s website (see hypertext link) or contact the author. The contents of this journal from 1998 to 2005 can be freely accessed online via the journal’s web page.|
|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 1997 Optometrists Association Australia|
|Deposited On:||25 Jan 2008|
|Last Modified:||20 May 2010 02:29|
Repository Staff Only: item control page