title: Optical Coherence Tomography Reveals New Insights into the Accommodation Mechanism.
abstract: Purpose. To evaluate the movement of the anterior and posterior lens poles during naturally stimulated accommodation in children using anterior segment optical coherence tomography (OCT). Methods. This is a prospective, observational, noncomparative case series including 18 eyes of nine children. Analysis of the anterior segment in the accommodated and unaccommodated state (with cycloplegia) was done using anterior segment OCT. The main outcome measures were the position of the anterior and posterior lens poles (in relation to the cornea) and lens thickness (LT). Results. A Statistically significant forward movement of the anterior lens pole and backward movement of the posterior lens pole with an increase in LT were found during accommodation (P < 0.001). There was no significant difference between the degree of movement of the anterior lens pole and the posterior lens pole during accommodation (P = 0.944). Conclusions. Anterior segment OCT provides a rapid noncontact method for studying accommodation in children. The backward movement of the posterior lens pole during accommodation nearly equals the forward movement of its anterior pole. These data minimize the theoretical hydraulic effect of the vitreous during accommodation, adding more support to the capsular theory of Helmholtz.
authors.affiliation: The Department of Ophthalmology and Visual Neuroscience, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan ; The Department of Ophthalmology, Sohag Faculty of Medicine, Sohag University, Sohag 82524, Egypt.
authors.forename: Mahmoud Mohamed
authors.initials: MM
authors.lastname: Farouk
authors.affiliation: The Department of Ophthalmology and Visual Neuroscience, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Naito
authors.affiliation: The Department of Ophthalmology and Visual Neuroscience, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan.
authors.forename: Kayo
authors.initials: K
authors.lastname: Shinomiya
authors.affiliation: The Department of Ophthalmology and Visual Neuroscience, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Eguchi
authors.affiliation: The Department of Ophthalmology and Visual Neuroscience, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan ; The Department of Ophthalmology, Sohag Faculty of Medicine, Sohag University, Sohag 82524, Egypt.
authors.forename: Khulood Mohammed
authors.initials: KM
authors.lastname: Sayed
authors.affiliation: The Department of Ophthalmology and Visual Neuroscience, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan.
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Nagasawa
authors.affiliation: The Department of Ophthalmology and Visual Neuroscience, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Katome
authors.affiliation: The Department of Ophthalmology and Visual Neuroscience, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan.
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Mitamura