Abstract
Accommodation is fundamental to vision, yet our understanding of the process remains limited. Highly detailed images of the iris and ciliary body region can be obtained through the use of ultrasound biomicroscopy. This technique utilizes high frequency transducers to produce B-scan images with axial and lateral resolution approaching 20 microns.
We performed a dynamic study of accommodation using ultrasound biomicroscopy and video recording. A 50 MHz transducer was used. Seven patients, ranging in age from 18 to 64 years, were examined. The anterior segment of one eye was imaged while the patient alternated between near and distance fixation with the other eye. The most remarkable changes were noted in the region of the posterior chamber. A posterior bowing of the iris occurred during accommodation, resulting in marked shallowing of the posterior chamber. This phenomena was most prominent in the younger patients of the group.
The use of ultrasound biomicroscopy provides a dynamic view of the anterior segment showing a characteristic posterior bowing of the iris during accommodation. This observation increases our understanding of ocular changes during accommodation.
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© 1997 Springer Science+Business Media Dordrecht
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McWhae, J.A., Crichton, A.C.S., Reimer, J. (1997). A dynamic study of accommodation using ultrasound biomicroscopy. In: Cennamo, G., Rosa, N. (eds) Ultrasonography in Ophthalmology XV. Documenta Ophthalmologica Proceedings Series, vol 61. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5802-2_27
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DOI: https://doi.org/10.1007/978-94-011-5802-2_27
Publisher Name: Springer, Dordrecht
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