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. 2006 Nov;32(11):1792-8.
doi: 10.1016/j.jcrs.2006.05.031.

Magnetic resonance imaging of aging, accommodating, phakic, and pseudophakic ciliary muscle diameters

Susan A Strenk  1 , Lawrence M Strenk, Suqin Guo
Affiliations

Magnetic resonance imaging of aging, accommodating, phakic, and pseudophakic ciliary muscle diameters

Susan A Strenk et al. J Cataract Refract Surg. 2006 Nov.

Abstract

Purpose: To quantify in vivo accommodative changes in the aging human ciliary muscle diameter in phakic and pseudophakic eyes.

Setting: Department of Surgery/Bioengineering, UMDNJ-Robert Wood Johnson Medical School, Piscataway, and the Institute of Ophthalmology and Visual Science UMDNJ-New Jersey Medical School, Newark, New Jersey, USA.

Methods: Images were acquired from 48 eyes of 40 people between the ages of 22 and 91 years, 1 eye of 32 phakic volunteers and both eyes of 8 patients who had monocular implantation of a single-piece AcrySof intraocular lens (IOL) (Alcon Laboratories). Images were acquired during physiological accommodation and with accommodation at rest, and the diameter of the ciliary muscle ring was measured.

Results: Results show the ciliary muscle remains active throughout life. The accommodative change in its diameter (mean 0.64 mm) (P<.00001) was undiminished by age or IOL implantation. Preliminary data showed that the accommodative decrease in muscle diameter in phakic and pseudophakic eyes was statistically identical. The phakic eyes had a marked decrease in ciliary muscle diameter with advancing age for both accommodative states (P<.000001 and P<.000001), which did not appear to be altered by IOL implantation. The lens equator was constant with age in the unaccommodated human eye, resulting in decreased circumlental space with advancing age in the phakic eyes.

Conclusion: Although the undiminished ability of the ciliary muscle to decrease its diameter with accommodation can be relied on in strategies for presbyopia correction, even in advanced presbyopia, the decreasing circumlental space and its potential effects on zonular tension must also be considered.

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Figures

Figure 1
Figure 1
A representative MR image of a phakic eye. Note that the ciliary processes are hyperintense to the ciliary muscle.
Figure 2
Figure 2
A representative image of a pseudophakic eye.
Figure 3
Figure 3
Ciliary muscle ring diameter versus age for minimum (diamonds) and maximum (squares) accommodation in the phakic eye.
Figure 4
Figure 4
Ciliary muscle ring diameter versus age for minimum (diamonds) and maximum (squares) accommodation in the pseudophakic eye.
Figure 5
Figure 5
Ciliary muscle ring diameter at minimum accommodation for phakic (diamonds) and pseudophakic (squares) eyes.
Figure 6
Figure 6
Ciliary muscle ring diameter at maximum accommodation for phakic (diamonds) and pseudophakic (squares) eyes.
See this image and copyright information in PMC

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