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Surgical Intervention and Accommodative Responses, I: Centripetal Ciliary Body, Capsule, and Lens Movements in Rhesus Monkeys of Various Ages

¹From the Departments of Ophthalmology and Visual Sciences and ²Biostatistics and Medical Informatics, and the ⁴Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, Wisconsin; and the ³Department of Anatomy II, University of Erlangen-Nürnberg, Erlangen, Germany.

PURPOSE. To determine how surgically altering the normal relationship between the lens and the ciliary body in rhesus monkeys affects centripetal ciliary body and lens movement.

METHODS. In 18 rhesus monkey eyes (aged 6–27 years), accommodation was induced before and after surgery by electrical stimulation of the Edinger-Westphal nucleus. Accommodative amplitude was measured by coincidence refractometry. Goniovideography was performed before and after intra- and extracapsular lens extraction (ICLE, ECLE) and anterior regional zonulolysis (ARZ). Centripetal lens/capsule movements, centripetal ciliary process (CP) movements, and circumlental space were measured by computerized image analysis of the goniovideography images.

RESULTS. Centripetal accommodative CP and capsule movement increased in velocity and amplitude after, compared with before, ECLE regardless of age (n = 5). The presence of the lens substance retarded capsule movement by 21% in the young eyes and by 62% in the older eyes. Post-ICLE compared with pre-ICLE centripetal accommodative CP movement was dampened in all eyes in which the anterior vitreous was disrupted (n = 7), but not in eyes in which the anterior vitreous was left intact (n = 2). After anterior regional zonulolysis (n = 4), lens position shifted toward the lysed quadrant during accommodation.

CONCLUSIONS. The presence of the lens substance, capsule zonular attachments, and Wieger’s ligament may play a role in centripetal CP movement. The capsule is still capable of centripetal movement in the older eye (although at a reduced capacity) and may have the ability to produce 6 D of accommodation in the presence of a normal, young crystalline lens or a similar surrogate.

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				R. Wasilewski, J. P. McDonald, G. Heatley, E. Lutjen-Drecoll, P. L. Kaufman, and M. A. Croft Surgical Intervention and Accommodative Responses, II: Forward Ciliary Body Accommodative Movement Is Facilitated by Zonular Attachments to the Lens Capsule Invest. Ophthalmol. Vis. Sci., December 1, 2008; 49(12): 5495 - 5502. [Abstract] [Full Text] [PDF]