View clinical trials related to Refractive Errors.
Filter by:The present research process is a prospective, non-interventional clinical study that will be conducted -under the auspices of the Democritus University of Thrace (DUTH)- in the pre-school students of the city of Alexandroupolis, Greece. - The study aims to assess the visual acuity of the kindergarten students. - The measurement of monocular best-spectacle corrected visual acuity will be performed using a web-based visual acuity chart
The purpose of this Post-Market Clinical Follow-Up (PMCF) study is to assess long term performance and safety of Air Optix Aqua, Air Optix plus HydraGlyde Sphere, and Air Optix plus HydraGlyde Toric soft contact lenses in a real-world setting when worn as daily wear.
The purpose of this study is to assess long term performance and safety of AONDA in a real world setting when worn as daily wear or continuous wear for vision correction. This study will be used to support AONDA's marketability in Europe and other locations.
The purpose of this study is to assess the clinical performance of two reusable silicone hydrogel contact lenses when worn on a daily wear basis.
The purpose of this clinical trial was to evaluate the clinical performance of a manufacturing process on a frequent replacement multifocal contact lens.
The clinical investigation objective is to evaluate safety and performance outcomes of trifocal IOL implantation to improve vision in patients with cataract and/or ametropia (hyperopia, myopia) and/or presbyopia. Retrospective data from preoperative status up to 12 month postoperative status will be collected from patients that were implanted with Medicontur's 640PM intraocular lens: - Preoperative status: Preoperative Screening and Baseline - Surgery: IOL implantation - M1: 1 month +/- 2 weeks postoperative follow-up - M3: 3 months +/- 1 month postoperative follow-up - M12: 12 months +/- 3 months postoperative follow-up
A prospective, self-control, double-blind design was conducted in Tianjin. Two hundred participants were assigned to wear two kinds of spectacle glasses. To examine the effect of free-toroidal design and aspherical lens on the subjective visual quality among the myopic population.
Phase 3 study to evaluate the safety and effectiveness of LNZ101 for the treatment of Presbyopia.
The aim of our study is to analysis and compare the relationship between ORA and postoperative astigmatism in low astigmatism (less than 1D) and moderate to high (1D to 3D) astigmatism patients after SMILE (Small Incision Lenticule Extraction) refractive surgery.
Approximately 340 participants (680 eyes) will be enrolled in this three-month, two-arm, 1:1 randomized, parallel-group, bilateral, double-masked study at approximately 22 investigative sites in the United States. Participants will be required to wear dispensed study lenses on a daily wear basis for three months with scheduled in-office replacement of study lenses at the 1-Month and 2-Month Follow-Up Visits.