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The effect of human in vivo accommodation on crystalline lens stability

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Schachar, Ronald A., Davila, Carlos, Pierscionek, Barbara K., Chen, Wickham and Ward, Warren W. (2007) The effect of human in vivo accommodation on crystalline lens stability. BRITISH JOURNAL OF OPHTHALMOLOGY, 91 (6). pp. 790-793. [Journal article]

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DOI: 10.1136/bjo.2006.110791


Aim: To determine the effect of human in vivo accommodation on the stability of the crystalline lens. Methods: Using a dual Purkinje image (DPI) eyetracker, the phase-time difference and amplitudes of Purkinje images I (P-I) and IV ( P-1V) were measured in 37 normal emmetropic subjects ( 34 women and 3 men; mean age 19.8, range 18-22 years) when they changed focus from 70 to 15 cm and simultaneously rotated their heads horizontally from side to side or made horizontal saccades between two targets 6.8 apart. Results: When the subjects changed focus from 70 to 15 cm and rotated their heads or made eye saccades, the phase-time difference between P-I and P-IV decreased. During saccades, the amplitude of both PI and PIV overshoots significantly increased with focus at 15 cm; however, their ratio (P-IV overshoot amplitude/P-I overshoot amplitude) significantly declined. Conclusions: The lens is stable during accommodation. The implications of these findings on the mechanism of accommodation are discussed.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > School of Biomedical Sciences
Research Institutes and Groups:Biomedical Sciences Research Institute
Biomedical Sciences Research Institute > Vision
ID Code:7622
Deposited By:Professor Barbara Pierscionek
Deposited On:18 Jan 2010 09:49
Last Modified:18 Jan 2010 09:49

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