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Am J Physiol Regul Integr Comp Physiol 271: R670-R676, 1996;
0363-6119/96 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 271, Issue 3 670-R676, Copyright © 1996 by American Physiological Society

ARTICLES

In vivo increase of the human lens equatorial diameter during accommodation

R. A. Schachar, C. Tello, D. P. Cudmore, J. M. Liebmann, T. D. Black and R. Ritch
Department of Physics, University of Texas at Arlington, Dallas 75379, USA.

The movement of the human lens equator during accommodation was examined in vivo. High-resolution ultrasound images of the lens equator were obtained from young human subjects whose amplitude of accommodation was controlled with 1% tropicamide and 2% pilocarpine. To avoid errors that otherwise arise from eye rotation or other movement, the cornea and sclera were used as positional references in comparative studies of the video images obtained from the unaccommodated and accommodated states. During accommodation, the movement at the lens equator involved small displacement; i.e., < 100 microns, and the equator did not move anteriorly or posteriorly but peripherally toward the sclera. These results indicate that the lens equator is under increased zonular tension during accommodation, in contradiction to Helmholtz's widely accepted theory of accommodation.


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M. A. Croft, J. P. McDonald, R. J. James, G. A. Heatley, T.-L. Lin, E. Lutjen-Drecoll, and P. L. Kaufman
Surgical Intervention and Accommodative Responses, I: Centripetal Ciliary Body, Capsule, and Lens Movements in Rhesus Monkeys of Various Ages
Invest. Ophthalmol. Vis. Sci., December 1, 2008; 49(12): 5484 - 5494.
[Abstract] [Full Text] [PDF]


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