View clinical trials related to Astigmatism.
Filter by:This phase IV study is an open, prospective, single-center, single-surgeon bilateral eye study to investigate the bilateral uncorrected intermediate visual acuity of presbyopic hyperopic patients, who have been treated with Presbyopia Algorithm SUPRACOR.
The purpose of this study is to evaluate the use of toric high cylinder power intraocular lenses in a larger population in clinical practice and assure the continued safety of these approved devices.
Primary Hypotheses: Senofilcon A will provide significantly less rotation with subjects in a recumbent position than Filcon II 3 monthly . Etafilcon A will provide significantly less rotation with subjects in a recumbent position than Filcon II 3 1 1 day . Etafilcon A will provide rotation with subjects a recumbent position non-inferior to nelfilcon A. A margin of 5 degrees will be used. Secondary Hypotheses: Senofilcon A will have significantly better monocular visual performance with subjects in a recumbent position than Filcon II 3 monthly. Etafilcon A for astigmatism will have significantly better monocular visual performance with subjects in a recumbent position than Filcon II 3 1 day. Etafilcon A will have monocular visual performance with subjects in a recumbent position non-inferior nelfilcon A. A margin of 0.05 LogMAR will be used.
This study is to evaluate the necessity of considering posterior corneal toricity on refractive outcome of patients with cataracts and corneal astigmatism after implantation of intraocular lenses. This is determined by comparing total corneal and refractive astigmatism,and by comparing the expected refractive result with actual refractive astigmatism postoperatively,using total corneal and anterior corneal astigmatism to calculate respectively.
This study is evaluating the initial fit of toric contact lenses.
The purpose is to evaluate the Calhoun Vision Light Adjustable Lens (LAL) and Light Delivery Device (LDD) for reducing astigmatism and improving uncorrected vision after implantation.
The purpose of this study was to demonstrate substantial equivalence of an investigational toric soft contact lens to the commercially available Focus® DAILIES® Toric soft contact lens when worn in a daily wear, daily disposable mode for three months.
The purpose of the study is to compare the results of LASIK surgery when using Alcon Allegretto wavefront-guided excimer laser system compared to AMO Visx Custom wavefront-guided excimer laser system in patients with nearsightedness with and without astigmatism.
The purpose of the study was to assess the efficacy of the Allegretto Wave excimer laser and the wavefront optimized ablation profile in correcting primarily non-anterior astigmatism faults, following laser in-situ keratomileusis (LASIK) and photorefractive keratectomy (PRK).
This clinical study has been planned to evaluate the safety and effectiveness of the SUPRACR presbyopic excimer laser treatment algorithm for myopic eyes developed for applying to the cornea of the human eye in a single center. The developed software algorithm uses the subjective refraction of the eye to create a treatment for the distance vision correction. This part of the treatment does not show any difference to a regular aspheric LASIK treatment for myopic cases. In addition to the treatment for the distance vision an additional central ablation component will be added to address the near vision. The study design is applied as a single center unilateral eye safety and effectiveness study of the SUPRACOR presbyopic algorithm for myopia with a 3 months postoperative follow up.