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Quantification of the Anterior-Centripetal Movement of the Ciliary Muscle During Accommodation Using Dynamic OCT Imaging.
Transl Vis Sci Technol
January 2025
Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, USA.
Purpose: Although the lens undoubtedly plays a major role in presbyopia, altered lens function could be in part secondary to age-related changes of the ciliary muscle. Ciliary muscle changes with accommodation have been quantified using optical coherence tomography, but so far these studies have been limited to quantifying changes in ciliary muscle thickness, mostly at static accommodative states. Quantifying ciliary muscle thickness changes does not effectively capture the dynamic anterior-centripetal movement of the ciliary muscle during accommodation.
View Article and Find Full Text PDFBackground: The ciliary muscle is known to play a part in presbyopia, but the mechanism has not received a comprehensive review, which this study aims to achieve. We examined relevant articles published from 1975 through 2022 that explored various properties of the muscle and related tissues in humans and rhesus monkeys. These properties include geometry, elasticity, rigidity, and composition, and were studied using a range of imaging technologies, computer models, and surgical methods.
View Article and Find Full Text PDFThe Clinical Usefulness of Evaluating the Lens and Intraocular Lenses Using Optical Coherence Tomography: An Updated Literature Review.
J Clin Med
November 2024
Centro Internacional de Oftalmología Avanzada, 28010 Madrid, Spain.
The Lens Dysfunction Syndrome includes two widespread ocular disorders: presbyopia and cataract. Understanding its etiology, onset, progression, impact, prevention, and treatment remains a significant scientific challenge. The lens is a fundamental structure of the ocular dioptric system that allows for focus adjustment or accommodation to view objects at different distances.
View Article and Find Full Text PDFVisual Quality Following Femtosecond Laser-Assisted In Situ Keratomileusis With Q-Value-Guided Optimized Monovision in Patients With Myopia and Presbyopia.
Am J Ophthalmol
November 2024
From the Department of Ophthalmology, Peking University Third Hospital (R.Z., Y.Y., Y.Z., Y.C.), Beijing, China; Beijing key laboratory of restoration of damaged ocular nerve, Peking University Institute of Laser Medicine (R.Z., Y.Y., Y.Z., Y.C.), Beijing, China. Electronic address:
Purpose: To evaluate the objective and subjective visual quality 3 months after femtosecond laser-assisted in situ keratomileusis (FS-LASIK) performed with Q-value-guided optimized monovision scheme (Custom-Q) for correction of myopia with or without astigmatism and compensate for age-related accommodation deficiency.
Design: Prospective before-and-after study.
Methods: Patients who had Custom-Q FS-LASIK for myopia with age-related accommodation deficiency were included in this prospective study.
Near Add Power of Glaucoma Patients with Early Presbyopia.
J Clin Med
September 2024
Chukyo Eye Clinic, Nagoya 456-0032, Japan.
Glaucoma medication may accelerate the progression of presbyopia. The aim of this study was to compare presbyopia between controls and patients with glaucoma in their 40s. This was a cross-sectional study of bilateral phakic participants aged between 40 and 49, which included controls ( = 114, mean age 46.
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