View clinical trials related to Cataract.
Filter by:To investigate changes in anterior chamber angle configuration after phacoemulsification and intraocular lens (IOL) implantation with Swept-Source Optical Coherence Tomography (SS-OCT).
The purpose of this study is to evaluate the visual outcome of the cataract surgery, including best uncorrected and corrected visual acuity, spherical equivalent, wavefront aberration and other measurements.
The pseudoexfoliation (PXF syndrome) is caused by production and deposition of extracellular material in the anterior chamber of the eye as well as in other tissues of the body. Approx. 70 million worldwide have a PXF syndrome. After cataract surgery a decentration and subluxation of the intraocular lens (IOL) happens more frequently than in the general population due to a higher incidence of zonular weakness and an increased capsular fibrotic reaction. Decentration, tilt and / or rotation of the lens can reduce the quality of vision. It is believed that the design of the implanted IOL, more precisely the front surface of the IOL has an influence on the extent of capsular fibrosis and contraction. Especially in presence of capsular instability, as it is in patients with Pseudoexfoliation syndrome the design of the IOL has an effect on the post-operative stability. In this study, two different IOL models are compared in terms of their stability. The "Tecnis 1-piece ZCB00" (AMO, USA), with a concave lowering comprising the lens edge and the "Acrysof SA60AT" (Alcon, USA), with a biconvex design are compared. Forty eyes of 20 patients are planned to be included in this study. One eye receives the "Tecnis ZCB00 1-piece "(AMO, USA), while the other eye receives the"Acrysof SA60AT "(Alcon, USA). In which eye which IOL is implanted, is assigned by randomization. To measure the decentration, tilt and rotation of the IOL an examination will be performed before the operation and there will be follow-ups one hour after the operation of the first eye, one hour after the operation of the second eye, three months and twelve months after the operation on the second eye. All measurements will be done without touching the eye.
More and more patients like to achieve complete spectacle independence after cataract surgery. Two possibilities that are particularly often used today are on the one hand multifocal lenses, and on the other hand the concept of monovision (in doing so one eye is adjusted for closeness and the other focuses for distance). The drawback with multifocal lenses is that some patients are bothered by glare phenomena, the disadvantage of monovision is that some patients lose a little of their stereo vision. The aim of this study is a direct comparison of these two methods. Therefore 70 patients are included in 2 groups. In one group, patients receive on both sides a multifocal IOL with a near addition of +1.5 D and the patients in the second group receive monovision. One hour, 1 week and 3 months after surgery, patients are invited and tests for visual accuity are performed for near vision (40cm), intermediate vision (80cm) and distant vision (400cm). Furthermore, contrast sensitivity and stereopsis of patients is assesed. Additional measurements for detecting the tilt of the lens will be performed.
Gabapentin pretreatment may reduce hyperalgesia occurring at the second surgery in serial, bilateral cataract surgery.
Purpose: To examine the safety of omitting the routine postoperative eye clinic review following phacoemulsification cataract surgery. Background: Approximately 300000 cataract extractions are performed annually in the NHS in England, requiring a similar number of post-operative visits, the majority of which result in no change in management. A conservative estimate of 70% of visits being unnecessary suggests a potential saving to the NHS of approximately £10M annually. What's involved: The study involves some questionnaires during the duration of the study. These include questionnaires relating to the quality of life of the patient (conducted before the operation, and at the 3 month research clinic) and a patient satisfaction questionnaire. There is also a research clinic 3 months following the operation. What are the risks/benefits: There are no real personal benefits to patients on the trial. The trial aims to provide very important information regarding the safety of discharging patients immediately after surgery. However the trial could potentially save many thousands of unnecessary hospital visits each year.
This study will compare toric intra-ocular lens (IOL) with limbal relaxing incisions (LRI) in correcting astigmatism in patient undergoing standard cataract surgery. Astigmatism is unequal curvature of the eye; the eye is oval rather than spherical. Uncorrected astigmatism of greater than approximately 0.75 diopters (D) can cause visual blurring, ghosting of images or halos. Over 20% of patients undergoing cataract surgery have astigmatism which is likely to have been corrected by spectacles. Cataract surgery involves the replacement of the natural opacifying crystalline lens with a clear artificial plastic intra-ocular lens (IOL). The lens power can be selected to correct the patient's glasses prescription. The most widely used IOLs only correct glasses at one distance i.e. either near or distance. Residual astigmatism after cataract surgery will need glasses for correction which is undesirable for many patients. Limbal relaxing incisions (LRI) are circumferential partial thickness cuts to the clear window of the eye (cornea) during surgery. These LRIs can correct corneal astigmatism and have no additional risk of complications. Alternatively, toric IOLs are available which correct astigmatism inside the eye. They have been available for routine use in the last few years; technology has markedly improved and the lenses have become cheaper. Studies have suggested toric IOLs provide better vision after cataract surgery than the regular IOLs. Toric IOL are widely used in the private practice and increasingly in the National Health Service (NHS). LRIs are cost effective for treating astigmatism however their predictability is believed to be lower than toric IOLs. As there are no randomised controlled trials comparing the outcomes between LRIs and toric IOLs. This research will address this gap in knowledge and accordingly from this research future practice will be able to provide treatment to patients with information about the best outcomes.
Cataract surgery is among the world's most frequently performed operations. It involves removal of an opaque lens from the human eye and implantation of an artificial lens. The operation is performed under local anaesthesia using ultrasound technology, by which the lens is emulsified and removed by suction. Femtosecond laser-assisted cataract surgery is a new innovative surgical procedure that can improve the quality of cataract surgery and provide a new best possible standard of quality. In contrast to the conventional method the capsulotomy and the fragemntation are fully automatically performed with a femtosecond laser. In addition, the lens is fragmented by the laser, which substantially facilitates its removal and reduces the operation time. Study to investigate whether the femtosecond laser cataract surgery causes any significant differences in clinical outcomes as compared to the conventional, manual continuous curvilinear capsulorhexis (CCC). Effective phako time (EPT) is defined as duration of phakoemulsifikation of the crystalline lens. EPT of conventional surgery at intraoperative visit > EPT oflaser-assisted surgery at intraoperative visit
The study aims at determining the best biometry calculation formula to be used in IOL calculation of cataract patients how previously underwent laser refractive correction surgery
Define what factors correlate with higher degrees of patient satisfaction and dissatisfaction among patients who have recently undergone cataract surgery.