The morphology of the anterior eye in three different angles of vertical gaze
Read, Scott A., Collins, Michael J., Carney, Leo G., & Iskander, D. Robert (2005) The morphology of the anterior eye in three different angles of vertical gaze. In 11th Scientific Meeting in Optometry, 27–28 September 2005, Queensland University of Technology, Brisbane, Australia.
Aim: To investigate the normative values of a range of biometric measures of the anterior eye in three different angles of vertical gaze in a population of young subjects. Methods: High resolution digital images of the right eye were taken of 100 young subjects in primary gaze and 20 degree and 40 degree downward gaze. The images were analysed using customwritten software. Results: Highly significant changes were found in the horizontal and vertical palpebral fissure dimensions, the palpebral fissure angle and the eyelid contour as a function of angle of gaze (p < 0.01 for all dimensions). The palpebral fissure narrows in the vertical dimension (from an average vertical palpebral aperture width for Caucasian subjects in primary gaze of 9.7 ± 1.2 mm to an average of 6.4 ± 1.1 mm in 40 degree down-gaze), shortens in the horizontal dimension (from average horizontal palpebral aperture width of 27.1 ± 1.5 mm in primary gaze to an average of 25.6 ± 1.8 mm in 40 degree down-gaze) and becomes more ‘downslanted’ with increasing downward gaze. Significant changes also occur to the upper and lower eyelid contour in down-gaze. Some dimensions of the anterior eye were found to differ significantly as a function of gender and ethnicity. Conclusion: The dimensions of the anterior eye undergo highly significant changes in downward vertical gaze. These changes highlight the dynamic nature of the anterior ocular structures that were measured. As many visual tasks are performed in various angles of downward gaze, these findings have implications for ocular surgery and the design and fitting of contact lenses.
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|Item Type:||Conference Paper|
|Additional Information:||Abstract published in Clinical and Experimental Optometry, 89(2), p. 105|
|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)
|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 2006 Blackwell Publishing|
|Deposited On:||18 Jan 2008|
|Last Modified:||03 Nov 2014 05:50|
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