Abstract
To measure changes in the anterior ciliary muscle during accommodation at the nasal, superior, temporal, and inferior sectors by means of an anterior chamber optical coherence tomographer, and correlate them with vergence changes. Twenty-four subjects with healthy, phakic eyes, whose mean age was 27.1 ± 8.9 years, underwent measurement with an anterior chamber optical coherence tomographer. The anterior ciliary muscle was measured at the nasal, temporal, superior, and inferior sectors for 0, -1, -2, and -3 D of vergence. A linear model was used to assess the correlation of each eye parameter with the accommodative demand. The anterior ciliary muscle area significantly increased with accommodation for each sector, with a maximum increase of about 30% for the nasal-temporal sectors and about 25% for the inferior-temporal sectors. The linear model showed a tendency toward a positive relationship between change in the ciliary muscle area of each sector and vergence. The anterior ciliary muscle area tends to increase with accommodation, although the increase has been shown to be symmetric between the pair sectors superior-nasal and inferior-temporal. These results may help to increase understanding of accommodation biometry and biomechanics.
Highlights
Information about the behavior of the ciliary muscle was first derived from histological studies performed postmortem in monkeys[1], in particular in rhesus monkeys, because of similarities in the accommodative structures[1], mechanisms[2], and development of presbyopia relative to time scales[3]
The results could help to increase the current understanding of accommodation biometry and biomechanics
Linear regression showed a tendency toward a positive association between changes in anterior ciliary muscle area and vergence for each muscle sector (Figure 4A-D)
Summary
Information about the behavior of the ciliary muscle was first derived from histological studies performed postmortem in monkeys[1], in particular in rhesus monkeys, because of similarities in the accommodative structures[1], mechanisms[2], and development of presbyopia relative to time scales[3]. Later, this kind of informa tion was obtained from monkeys, and from human eyes. There is no in vivo evidence of changes in the superior and inferior ciliary muscle during accommodation
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