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Forward and Inward Movement of the Ciliary Muscle Apex with Accommodation in Adults

Prosak, Trang P
http://rave.ohiolink.edu/etdc/view?acc_num=osu1397425606

Abstract Details

2014, Master of Science, Ohio State University, Allied Medical Professions.
Purpose: to study the inward and forward movement of the ciliary muscle during accommodation and to investigate the effects of one hour of reading on the ciliary muscle behavior in young adults. Methods: Subjects included 23 young adults with a mean age of 23.7 ± 1.9 years. Images of the temporal ciliary muscle of the right eye were obtained using the Visante™ Anterior Segment Ocular Coherence Tomography while accommodative response was monitored simultaneously by the Power-Refractor. Four images were taken at each accommodative response level (0, 4.0 and 6.0 D) before and after one hour of reading. Ciliary muscle thickness was measured at every 0.25 mm posterior to the scleral spur. SSMAX, which is the distance between scleral spur and the thickest point of the muscle (CMTMAX), was also measured. The change in the ciliary muscle thickness and SSMAX with accommodation from 0 to 4.0 D and 0 to 6.0 D was calculated. Paired t-tests were used to determine if the ciliary muscle thickness and SSMAX for the 4.0 and 6.0 diopters of accommodative response were different after one hour of reading. Results: Before one hour of reading, for the change from 0 to 4.0 D, CMTMAX increased by 78.09 ± 64.80 µm (p < 0.0001), CMT1 increased by 69.25 ± 61.37 µm (p < 0.0001) and SSMAX decreased by -156.57 ± 265.03µm (p = 0.0097). For the change from 0 to 6.0 D, CMTMAX increased by 95.64 ± 60.86 µm (p < 0.0001), CMT1 increased by 76.75 ± 56.80 (p < 0.0001) and SSMAX decreased by -209.34 ± 216.53 µm (p = 0.0001). A period of one hour of reading had no effect on CMTMAX, CMT1 and SSMAX for either the 4.0 D condition (p = 0.4, 0.2, 0.2 respectively) or the 6.0 D condition (p = 0.3, 0.3, 0.8 respectively). Conclusions: Using the Visante images, we were able to show that during accommodation, the ciliary muscle becomes thicker anteriorly and thinner posteriorly while the muscle apex moves forward, demonstrated by the decrease in SSMAX. The results also suggest that, on average, the amount of thickening or thinning and the forward movement of the ciliary muscle are not altered after an extended period of reading in young adults. Future investigations will consider whether or not the overall dimensions of the ciliary muscle impact the accommodation of the ciliary muscle after extended reading and/or how advancing age affects the forward and inward movement of the ciliary muscle.
Melissa Bailey, OD, PhD (Advisor)
60 p.
Ophthalmology; Optics
ciliary muscle, accommodation

Recommended Citations

Citations

  • Prosak, T. P. (2014). Forward and Inward Movement of the Ciliary Muscle Apex with Accommodation in Adults [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397425606

    APA Style (7th edition)

  • Prosak, Trang. Forward and Inward Movement of the Ciliary Muscle Apex with Accommodation in Adults . 2014. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1397425606.

    MLA Style (8th edition)

  • Prosak, Trang. "Forward and Inward Movement of the Ciliary Muscle Apex with Accommodation in Adults ." Master's thesis, Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397425606

    Chicago Manual of Style (17th edition)

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