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Magnetic resonance imaging of aging, accommodating, phakic, and pseudophakic ciliary muscle diameters.
J Cataract Refract Surg 2006; 32(11):1792-8JC

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.

Authors+Show Affiliations

Department of Surgery/Bioengineering, University of Medicine and Dentistry of New Jersey (UMDNJ)-Robert Wood Johnson Medical School, Piscataway, New Jersey, USA. sstrenk@wowway.comNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural

Language

eng

PubMed ID

17081859

Citation

Strenk, Susan A., et al. "Magnetic Resonance Imaging of Aging, Accommodating, Phakic, and Pseudophakic Ciliary Muscle Diameters." Journal of Cataract and Refractive Surgery, vol. 32, no. 11, 2006, pp. 1792-8.
Strenk SA, Strenk LM, Guo S. Magnetic resonance imaging of aging, accommodating, phakic, and pseudophakic ciliary muscle diameters. J Cataract Refract Surg. 2006;32(11):1792-8.
Strenk, S. A., Strenk, L. M., & Guo, S. (2006). Magnetic resonance imaging of aging, accommodating, phakic, and pseudophakic ciliary muscle diameters. Journal of Cataract and Refractive Surgery, 32(11), pp. 1792-8.
Strenk SA, Strenk LM, Guo S. Magnetic Resonance Imaging of Aging, Accommodating, Phakic, and Pseudophakic Ciliary Muscle Diameters. J Cataract Refract Surg. 2006;32(11):1792-8. PubMed PMID: 17081859.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Magnetic resonance imaging of aging, accommodating, phakic, and pseudophakic ciliary muscle diameters. AU - Strenk,Susan A, AU - Strenk,Lawrence M, AU - Guo,Suqin, PY - 2006/03/24/received PY - 2006/05/27/accepted PY - 2006/11/4/pubmed PY - 2006/12/12/medline PY - 2006/11/4/entrez SP - 1792 EP - 8 JF - Journal of cataract and refractive surgery JO - J Cataract Refract Surg VL - 32 IS - 11 N2 - 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. SN - 0886-3350 UR - https://www.unboundmedicine.com/medline/citation/17081859/Magnetic_resonance_imaging_of_aging,_accommodating,_phakic,_and_pseudophakic_ciliary_muscle_diameters L2 - https://linkinghub.elsevier.com/retrieve/pii/S0886-3350(06)01041-8 DB - PRIME DP - Unbound Medicine ER -