View clinical trials related to Astigmatism.
Filter by:The study objective was to compare short-term clinical performance data of two toric contact lenses.
The intended purpose of the investigational device in the study is the correction of myopia and myopia with astigmatism in the CE (Conformité Européene) approved range and optimized for presbyopic patients using the treatment option HiSMILE, installed on the VisuMax femtosecond laser.
This prospective non-comparative interventional study aims to analyse the pre-operative factors affecting the range of optimal ICL vaulting. the main question is what is the correlation between age, gender, spherical equivalent, white to white, anterior chamber volume and depth and postoperative vault? participants will do preoperative investigations ( specular microscopy, pentacam and biometry ) then refractive surgery (ICL implantation) followed by follow-up visits to assess the post-operative ICL vault and visual outcome.
The study objective was to gather short-term clinical performance data for two soft toric contact lenses.
Cataracts are the major cause of blindness in the world. Cataract surgery, being the most performed surgery in the world today, provide correction by extracting the natural lens from its capsular bag and replaced by an artificial intraocular lens (IOL) implantation. In the UK, almost all patients undergoing cataract surgery by the NHS are given monofocal intraocular lenses (IOLs) which do not correct corneal astigmatic error. It is estimated that around 20% of the population has over 1.50DC of corneal astigmatism. Uncorrected astigmatism not only increase spectacle dependency and reduce quality of life post surgically, but it also adversely affects the overall economic costs. Specialised toric IOLs offer the opportunity to correct pre-existing corneal astigmatism. Previous work has shown a link between reduced vision and balance or mobility. Full correction of refractive error may have greater impact on lifestyle than previously thought.
This study evaluates differences in postoperative visual outcomes between patients receiving Topography-Guided LASIK in one eye and Small Incision Lenticule Extraction in the other eye.
The aim of our study is to analysis and compare the relationship between ORA and postoperative astigmatism in low astigmatism (less than 1D) and moderate to high (1D to 3D) astigmatism patients after SMILE (Small Incision Lenticule Extraction) refractive surgery.
The purpose of this prospective multicenter clinical study is to evaluate the visual and refractive outcomes and safety outcomes following bilateral implantation of trifocal and/or trifocal toric 1stQ AddOn (Medicontur) intraocular lenses (IOLs) to correct residual refractive errors, astigmatism, and presbyopia in previously pseudophakic eyes.
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
Comparison of wear experience with daily disposable and monthly replacement soft contact lenses in contact lens wearers who have astigmatism.