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Active clinical trials for "Myopia"

Results 651-660 of 694

Contact Lenses and Myopia

Myopia

The objective of this study is to determine if multifocal contact lenses affect accommodation and/or binocular vision when worn by pediatric patients. This will be accomplished through subjective and objective accommodative and binocular experiments in children wearing single vision and multifocal soft contact lenses.

Completed6 enrollment criteria

Ultrastructure Analysis of Excised Internal Limiting Membrane in Eyes of Highly Myopia With Myopic...

Myopic Traction Maculopathy

The excised ILM from 7 eyes of 7 patients with MTM including 7 eyes with macular retinoschisis and 4 eyes with foveal detachment but without any retinal break underwent vitrectomy with induction of posterior vitreous detachment and ILM peeling was examined to evaluate ultrastructure with electron microscopy.

Completed2 enrollment criteria

A Comprehensive Assessment of Anterior Corneal Power by Different Devices

Myopia

To comprehensively assess the precision and agreement of anterior corneal power measurements using 8 different devices.

Completed8 enrollment criteria

Association Between Retinal Microvasculature and Optic Disc Alterations in Non-pathological High...

Myopia

Non-pathological high myopia patients and controls undergoing a comprehensive ophthalmologic examination are included. The Optical Coherence Tomography Angiography (OCTA) software automatically segments these full-thickness retinal scans into the superficial and deep inner retinal vascular plexuses, outer retina, and choriocapillaris (CC). The vascular density in the superficial and deep retinal vascular zones is calculated automatically by the software, and the foveal avascular zone (FAZ) and foveal density (FD) are also automatically determined. Choroidal thickness is calculated manually by two retinal specialists, and the average value was used.

Completed8 enrollment criteria

A 3-year Cross-sectional Assessment of the Tianjin Child and Adolescent Large-scale Eye Study

Myopia

This is a school-based, cross-sectional study to assess the incidence and prevalence, risk factors of myopia among schoolchildren in both eye-use environment, eye-use habits, lifestyle, and family and subjective factors before and during COVID-19. Large population and representative study subjects. Environmental exposure and daily within and out-of-school activities will be evaluated in a random subgroup.

Completed4 enrollment criteria

Polarization Sensitive Optical Coherence Tomography

Myopia

The purpose of the study is to use the polarization sensitive optical coherence tomography (PS-OCT) developed by Singapore Eye Research Institute, to evaluate the potential OCT scleral biomarkers capable of predicting risk of myopia progression.

Completed14 enrollment criteria

Prospective Clinical Study of Retinal Microvascular Alteration After ICL Implantation

AdolescentAdult14 more

To observe the retinal microvascular alteration during 3 months follow-up after Implantable Collamer Lens (ICL) operation in moderate and high myopia patients using quantitative optical coherence tomography angiography (OCTA) analysis.

Completed9 enrollment criteria

Development and Validation of a Digital Optotype for Near Vision in Greek Language.

PresbyopiaLow Vision1 more

Primary objective of our study is to develop and validate a computer-based digital near-vision optotype based on the Greek version of the print MNREAD.

Completed5 enrollment criteria

Metabolic Screening in Patients With Donnai-Barrow Syndrome

Donnai-Barrow Syndrome

This study focuses on the genetics and metabolism of Donnai-Barrow Syndrome (DBS).

Completed1 enrollment criteria

Comparison of Intralase and Visumax Femtosecond Laser for Laser In Situ Keratomileusis

Myopia

Emtosecond lasers are used in cutting the flap in LASIK procedures (laser corrective surgery for refractive error). Their use has decreased the incidence of serious complications when compared to the use of microkeratomes(mechanical blades). The commonest femtosecond laser currently used is 'Intralase'. A newer femtosecond laser 'Visumax' (Zeiss) is now available and differs from the Intralase in that it does not interfere with the curvature of the cornea when creating the flap. The Intralase applanates the cornea flat during flap creation which causes the intraocular pressure to be higher. Both Intralase and Visumax lasers are available to patients and surgeons to use at SNEC. The aim of the investigators study is to compare the two lasers in a randomization of left and right eyes in the same patient. The investigators want to measure any difference that the lower intraocular pressure may have during the creation of the flap. This will be measured with a questionaire on patient experience during the procedure and the outcomes of vision, refraction, contrast sensitivity, wave-front analysis, tear function,corneal sensation and flap thickness measured with anterior segment OCT during the post-operative follow up period. To date no-one has compared the use of these two femtosecond lasers. Both lasers are currently used clinically for flap creation at SNEC.

Completed17 enrollment criteria
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