Active clinical trials for "Astigmatism"

The purpose of this study is to determine whether the prescription determined for a new daily disposable toric contact lens will be a good match to a prescription determined for an existing brand of lens.

The study hypothesis is that the Biofinity Toric XR lenses will perform as well as or better than the participants' habitual contact lenses.

The purpose of this study is to evaluate the clinical performance, defined as successful fit, of two toric contact lenses (one daily disposable and the other daily wear reusable contact lens to correct astigmatism) in current spherical soft contact lens wearers, contact lens drop-outs, and non-users of toric contact lenses (neophytes).

The purpose of this study is to determine the relative performance of a new toric soft contact lens against a toric and a spherical contact lens currently available in market, specifically with regards to the fit and visual acuity as well as the comfort, vision and satisfaction while in the practitioner's office. Approximately 2 hours duration.

The purpose of this study is to compare LASIK outcomes using the WaveLight ALLEGRETTO WAVE™ wavefront guided or optimized excimer laser treatment with the AMO/VISX CustomVue™ and the LADARVision 4000 excimer laser treatment. Standard refractive outcomes such as uncorrected and best corrected visual acuity, and intended vs. achieved postoperative refractions will be evaluated; in addition, high order optical aberrations, contrast sensitivity, and topography will be measured.

The aim of the study is to compare functional results and complications of 3 methods of cataract phacoemulsification: bimanual 1.4 mm cataract surgery (B-MICS), coaxial 1.8 mm cataract surgery (C-MICS) and coaxial 2.4 mm small incision cataract surgery.

This will be a single-visit, randomized, double-masked, bilateral wear, non-dispensing, 2-sequence × 2-period crossover study to evaluate subject reported ocular symptoms.

The purpose of this study was to evaluate the clinical performance and subjective lens handling (insertion and removal) of two toric silicone hydrogel contact lenses after one month of daily wear each.

This non-dispensing study is to evaluate the clinical performance of a test multifocal toric silicone hydrogel contact lens compared to a marketed multifocal toric contact lens (control).

This study was conducted to evaluate the clinical performance of an investigational silicone-hydrogel lens against Senofilcon A toric lens. The study results were not used for design validation of the investigational product.