View clinical trials related to Cataract.
Filter by:Following cataract surgery, an intraocular lens (IOL) is implanted in the eye. The majority of people develop an operable cataract when they are over the age of 50. Occasionally people under 50 years develop a cataract requiring an operation. The visual demands in this age group are very different due to both physiological and lifestyle factors. Traditionally IOLs are focussed for distance vision and additional spectacles are worn for near vision. Under the age of 45 years we have the ability to naturally change the focus of our eyes and do not require additional reading glasses. This is known as accommodation. By removing the cataractous lens and replacing it with an IOL with a fixed single focus, both eyes work together for distance vision but only the unoperated eye is able to change focus for different working distances. This study aims to establish whether a multifocal IOL implanted in one eye is able to complement the accommodation in the other eye so the 2 eyes work more effectively together. This may enhance depth perception and improve the quality of vision. Depth perception is important for more comfortable vision on the computer screen, when reading and for jobs that require good depth perception.
This is a safety and efficacy study of a Dexamethasone Drug Delivery System for anterior segment inflammation and pain following cataract extraction with lens implantation.
Intraocular Lens (IOL) formulas sometimes differ from expected. Using novel measurement methods before and after cataract surgery improved formulas are tried be developed.
Many patients with endothelial dysfunction also present with cataracts. It is therefore common practice to perform cataract extraction and intraocular lens (IOL) implantation during the same operation and immediately prior to Descemet's Stripping Automated Endothelial Keratoplasty (DSAEK), in order to minimize trips to the operating room and the associated risks of ocular surgery. However, the unique posterior corneal anatomy of the DSAEK recipient makes it difficult to predict pre-operatively the proper power of IOL to place, and some patients end up with a mismatched lens that requires spectacle correction. The current gold standard for IOL power calculation (A-Scan optical biometry) takes measurements of the anterior surface of the cornea and makes assumptions about the posterior surface that are violated by the unique hourglass shape of the donor DSAEK graft. New optical coherence tomography (OCT) technology provides us with the ability to measure curvature in both the anterior and posterior aspects of the cornea in order to generate an IOL calculation that has the potential to give more accurate results for our DSAEK patients. The investigators will be using the Optovue to perform corneal power analysis on patients who have already received DSAEK and cataract surgery, in order to compare the post-op Optovue power calculations to the pre-operative power calculations provided by the A-Scan. If the OCT is shown to provide accurate IOL power calculations, then some patients might be better served by a two-stage procedure where DSAEK is performed and then followed six months later by cataract surgery using the OCT to calculate IOL power.
The objective of this study is to compare the safety and efficacy of Mapracorat Ophthalmic Suspension, 3% to vehicle for the treatment of postoperative inflammation and pain following cataract surgery.
This study compares two intraocular lenses, the Softec HD and the Tecnis Z9002, used to replace the natural crystalline lens after cataract extraction. The variables compared include 1) the accuracy of targeted versus achieved refractive outcomes and 2) visual acuity outcomes three months after implantation.
The objective of this study is to demonstrate the correlation of near vision and changes in higher order aberrations following lens extraction and to characterize the defocus curves of Crystalens® AO™ intraocular lens (IOL) versus the monofocal aspheric SofPort® LI61AO IOL in adults.
This study will test the efficacy and safety of IBI-10090 in the treatment of ocular inflammation after cataract surgery.
The objectives of this study are to assess and compare bilateral uncorrected distance visual acuity and distance spectacle independence post bilateral implantation of AcrySof Toric Intraocular Lenses (IOLs) and monofocal IOLs. Secondary outcomes will include cost of eyeglass purchased and patient vision-related quality of life.
The objective of this study is to evaluate the postoperative visual function of Taiwanese patients following bilateral or unilateral AcrySof Toric Intraocular Lens (IOL) implantation.