Visual field coordinates of pupillary circular axis and optical axis

Atchison, David A., Mathur, Ankit, Suheimat, Marwan, & Charman, W. Neil (2014) Visual field coordinates of pupillary circular axis and optical axis. Optometry and Vision Science, 91(5), pp. 582-587.

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Abstract

Purpose: We term the visual field position from which the pupil appears most nearly circular as the pupillary circular axis (PCAx). The aim was to determine and compare the horizontal and vertical co-ordinates of the PCAx and optical axis from pupil shape and refraction information for only the horizontal meridian of the visual field.

Method: The PCAx was determined from the changes with visual field angle in the ellipticity and orientation of pupil images out to ±90° from fixation along the horizontal meridian for the right eyes of 30 people. This axis was compared with the optical axis determined from the changes in the astigmatic components of the refractions for field angles out to ±35° in the same meridian.

Results: The mean estimated horizontal and vertical field coordinates of the PCAx were (‒5.3±1.9°, ‒3.2±1.5°) compared with (‒4.8±5.1°, ‒1.5±3.4°) for the optical axis. The vertical co-ordinates of the two axes were just significantly different (p =0.03) but there was no significant correlation between them. Only the horizontal coordinate of the PCAx was significantly related to the refraction in the group.

Conclusion: On average, the PCAx is displaced from the line-of-sight by about the same angle as the optical axis but there is more inter-subject variation in the position of the optical axis. When modelling the optical performance of the eye, it appears reasonable to assume that the pupil is circular when viewed along the line-of-sight.

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ID Code: 79429
Item Type: Journal Article
Refereed: Yes
Keywords: astigmatism, asymmetry, optical axis, peripheral vision, pupillary circular axis, pupil shape, visual field
DOI: 10.1097/OPX.0000000000000228
ISSN: 1538-9235
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
Copyright Owner: Copyright 2014 American Academy of Optometry
Copyright Statement: This is a non-final version of an article published in final form in Optometry & Vision Science. 91(5):582-587, May 2014. doi: 10.1097/OPX.0000000000000228
Deposited On: 15 Dec 2014 04:43
Last Modified: 08 Jun 2015 18:14

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