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Macular choroidal thickness in keratoconus.
Clin Exp Optom
August 2024
Refractive Errors Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Clinical Relevance: Expanding practitioner knowledge regarding potential changes in ocular structure of keratoconic eyes will improve the eye care practice and patient management.
Background: This study aimed to compare the difference in choroidal thickness between keratoconus patients and two control groups of myopic-astigmatism and emmetropic subjects.
Methods: A case-control study was undertaken which included 50 patients with keratoconus, 50 with myopic-astigmatism, 30 with emmetropia aged between 18 and 39 years.
Perception and awareness of the public about presbyopia and its corrective approaches in Saudi Arabia: a population-based survey.
BMC Public Health
July 2024
Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia.
Background: This study investigated patients' awareness of presbyopia and its management approaches and their preferred methods for near vision correction.
Methods: In Saudi Arabia, 785 participants (aged between 35 and 60 years) completed a structured survey online, consisting of hard copies and direct interviews. The survey consisted of twenty-eight items divided into three parts.
Mechanisms of emmetropization and what might go wrong in myopia.
Vision Res
July 2024
Myopia Research Group, Institute of Molecular and Clinical Ophthalmology Basel (IOB), Switzerland.
Studies in animal models and humans have shown that refractive state is optimized during postnatal development by a closed-loop negative feedback system that uses retinal image defocus as an error signal, a mechanism called emmetropization. The sensor to detect defocus and its sign resides in the retina itself. The retina and/or the retinal pigment epithelium (RPE) presumably releases biochemical messengers to change choroidal thickness and modulate the growth rates of the underlying sclera.
View Article and Find Full Text PDFFinite Element Analysis of Changes in Deformation of Intraocular Segments by Airbag Impact in Eyes of Various Axial Lengths.
Clin Ophthalmol
March 2024
Department of Ophthalmology, Fukuoka University School of Medicine, Fukuoka, Japan.
Background: We studied the kinetic phenomenon of an airbag impact on eyes with different axial lengths using finite element analysis (FEA) to sequentially determine the physical and mechanical responses of intraocular segments at various airbag deployment velocities.
Methods: The human eye model we created was used in simulations with the FEA program PAM-GENERIS. The airbag was set to impact eyes with axial lengths of 21.
The effect of multifocal contact lenses on the dynamic accommodation step response.
Ophthalmic Physiol Opt
March 2024
Department of Vision Sciences, Glasgow Caledonian University, Glasgow, UK.
Purpose: To measure the dynamic accommodation response (AR) to step stimuli with and without multifocal contact lenses (MFCLs), in emmetropes and myopes.
Methods: Twenty-two adult subjects viewed alternating distance (0.25D) and near (3D) Maltese crosses placed in free space, through two contact lens types: single vision (SVCL) or centre-distance multifocal (MFCL; +2.
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