View clinical trials related to Astigmatism.
Filter by:The purpose of this study is to assess long term performance and safety of verofilcon A soft contact lenses in a real-world setting in a population of 7 years or older having at least 1 year of verofilcon A (sphere or toric) contact lens wear in a daily wear and daily disposable modality.
The purpose of this study is to evaluate on-eye clinical performance of the investigational contact lenses following 30 days of wear in the intended population.
The purpose of this Post-Market Clinical Follow-Up (PMCF) study is to continuously assess the visual performance and safety of TOTAL30 Sphere and TOTAL30 for Astigmatism contact lenses in a real-world setting across a broad variety of patients through routine clinical practices.
Refractive errors and corneal astigmatism are associated with changes in angle kappa and corneal back elevation at the thinnest point in Pentacam. The purpose of this study is to track: The effect of anterior corneal astigmatism treatment on angle kappa and corneal back elevation.
The purpose of this study is to report the prevalence data for total corneal astigmatism (TCA) in cataract surgery candidates.
Demonstrate that refraction measurements from the device agree with refraction measurements from a phoropter within clinically meaningful limits.
Subjects will undergo SMILE surgery in one eye and LASIK using Contoura with Phorcides on the contralateral eye to correct myopia.
To evaluate the efficacy, safety and accuracy of Contoura topography-guided LASIK & PRK in comparison to Wavefront optimized LASIK & PRK in virgin eyes with astigmatism.
The goal of this is prospective, computer based randomized clinical trial is to compare the efficacy of reduction of the pre-existing corneal astigmatism at the time of cataract surgery in patients admitted in sohag university hospital. the main questions it aims to answer are : - Is limbal relaxing incisions as effective as the paired opposite 4mm clear corneal incisions technique in reduction of corneal astigmatism at the time of cataract surgery ? - Are both techniques effective in treating mild degrees of corneal Astigmatism ? All participants will have full ophthalmological examination necessary for routine cataract surgery, then randomly divided into 2 groups, clear corneal incision group & limbal relaxing incision group. Researcher will compare difference between both groups regarding the following : - Uncorrected distance visual acuity (UCVA) - Best Corrected visual acuity (BCVA) - keratometry readings
Most of the patients presenting for cataract surgery also have pre-existing corneal astigmatism which if left uncorrected can adversely affect visual and refractive outcomes after cataract surgery. Pre-existing astigmatism at the time of cataract surgery can be corrected by either corneal relaxing incisions or implantation of toric IOLs. While the safety and efficacy of these procedures are well established, there are various challenges associated with these techniques that surgeons need to overcome to achieve good outcomes postoperatively. The use of iris registration technology that automatically compensates for cyclotorsion has the potential to improve the alignment accuracy of CRI or toric IOLs. The Cassini Ambient and Catalys Femtosecond Laser incorporate this technology to help cataract surgeons accurately align toric IOLs on the intended axis of implantation or accurately place CRI on the intended meridian. The present study is aimed at evaluating the efficacy of astigmatism correction during femtosecond laser-assisted cataract surgery with Catalys femtosecond laser. The patients will either undergo iris registration guided CRIs or iris registration guided alignment of toric IOLs.