View clinical trials related to Astigmatism.
Filter by:The purpose of this study is to measure visual acuity and Intraocular Lens (IOL) rotational stability after implantation of TORIC IOL and to assess the post operative complications after implantation of TORIC IOL.
The purpose of the study is to compare the results of LASIK surgery when using two versions of a femtosecond laser in patients with nearsightedness with and without astigmatism.
The purpose of this trial was to compare the performance of two contact lenses commercially available for people with astigmatism.
To determine if arcuate incisions performed with the iFS femtosecond laser are safe and effective in reducing corneal astigmatism.
The purpose of this study is to compare the overall performance of a monthly replacement contact lens when worn for one month and when worn for two weeks.
The purpose of this study is to look at the outcomes of your vision after your cataract surgery based on two different types of equipment that will be used during your surgery.
The purpose of this study is to determine if there is any difference in astigmatism (eye surface curvature) or corneal endothelial cell density (the inner cell lining of the eye surface) after two different methods for inserting a lens during cataract surgery.
Background: Small Incision Lenticule Extraction or SMILE is a novel form of 'flapless' corneal refractive surgery that was adapted from Refractive Lenticule Extraction (ReLEx). SMILE uses only one femtosecond laser to complete the refractive surgery, potentially reducing surgical time, side effects and cost. If successful, SMILE could potentially replace the current, widely practiced Laser In-situ Keratomileusis or LASIK. The aim of this study is to evaluate whether SMILE is non-inferior to LASIK in terms of refractive outcomes at 3-months post-operatively. Methods/ Design: Single tertiary center, parallel group, single-blinded, paired-eye design, non-inferiority, randomized controlled trial. Participants who are eligible for LASIK will be enrolled for study after informed consent. Each participant will be randomized to receive SMILE and LASIK in each eye. Our primary hypothesis (stated as null) in this non-inferiority trial would be that SMILE differs from LASIK in adults (>21 years old) with myopia (> -3.00D) at a tertiary eye center in terms of refractive predictability at 3 months post-operatively. Our secondary hypothesis (stated as null) in this non-inferiority trial would be that SMILE differs from LASIK in adults (>21 years old) with myopia (> -3.00D) at a tertiary eye center in terms of other refractive outcomes (efficacy, safety, higher-order aberrations) at 3 months post-operatively. Our primary outcome is refractive predictability, which is one of several standard refractive outcomes, defined as the proportion of eyes achieving a postoperative spherical equivalent (SE) within ±0.50 diopter (D) of the intended target. Randomization will be performed using random allocation sequence generated by a computer with no blocks or restrictions, and implemented by concealing the number-coded surgery within sealed envelopes until just before the procedure. In this single-blinded trial, subjects and their caregivers will be blinded to the assigned treatment in each eye. Discussion: This novel trial will provide information on whether SMILE has comparable, if not superior, refractive outcomes compared to the established LASIK for myopia, thus providing evidence for translation into clinical practice.
This study is an evaluation of visual outcomes of subjects implanted with the AcrySof Toric Intraocular Lenses (IOLs) Models SN60T3, SN60T4, and SN60T5.
The purpose of this study was to assess the comfort of OPTI-FREE RepleniSH in soft contact lens wearers.