Magnetic Resonance Imaging of the Presbyopic Eye
Magnetic resonance imaging (MRI) is a noninvasive process for imaging internal structures in the body. High-resolution imaging of the ciliary muscle and lens can be utilized to verify the predictions from the computer simulation model of presbyopia described by Semmlow et al. (Chapter 24). Data for this model were obtained from experiments using topically applied drugs to diminish or enhance the effectiveness of the ciliary muscle. Although the model demonstrates that the presbyopic mechanism is primarily lenticular, and that ciliary muscle change is not fundamental to this process, it does not rule out some change in ciliary muscle response as presbyopia advances. However, the relationship between ciliary muscle and lens response during presbyopia cannot be unambiguously determined by analysis of external behavior alone, such as that observed in the drug studies. High-resolution MRI could provide a direct measurement of ciliary muscle response at known levels of lens accommodation response.
KeywordsSurface Coil Contractile State Ciliary Muscle Magnetic Resonanee Image Diagnostic Magnetic Resonance Imaging
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- Fischer, R. F., 1986, The citiary body in accommodation, Trans. Ophthalmol. Soc. U.K. 105:208–219Google Scholar