View clinical trials related to Cataract.
Filter by:Age-related cataracts remain the leading cause of treatable blindness in China. The prevalence of cataract blindness continues to climb due to the expanding elderly subpopulation. Surgery is the only available treatment; however, the cataract surgical rate (CSR) in China remains relatively low relative to affluent countries or certain developing areas. Studies have reported that the primary barrier to cataract surgery is financial difficulty, and this challenge could be efficiently addressed by reducing the surgical fee or providing free cataract surgery. However, the prices, availability and affordability of medicines or medical services to the poor in China require further improvement. Although a host of free cataract screening and surgery programs have been widely implemented in rural areas of China, free cataract surgery programs have rarely been implemented in financially-challenged urban China. Even in Guangzhou, one of the largest metropolises in China, many low-income cataract patients, a neglected cohort, continue to need cataract surgery. A program titled "care for your eyes, lighten your life", jointly sponsored by the People's Government of Guangzhou Municipality, the Bureau of Civil Affairs of Guangzhou Municipality, and the Zhongshan Ophthalmic Center (ZOC), has been initiated in Guangzhou to implement a program of free clinics in parks and free cataract surgery targeting the impoverished population living in urban China in 2012. After 3 years' exploration, the management mode of this program has been perfected, and approximately 4000 cataract surgeries had been performed on the low-income elderly. Although there are a large number of poor communities throughout the country, free cataract surgery programs in poor urban China are restricted to several metropolises due to limited medical resources and social overlook. Fully understanding patient satisfaction regarding the free cataract surgery program and understanding the patient characteristics of this special, neglected community may contribute to the improvement and the further expansion of the management mode of free cataract surgery programs.
The objective of this study is to assess the visual outcome after the combined binocular implantation of +2.0 D and +3.0 D refractive multifocal intraocular lenses.
The objective of this study is to assess the visual outcome after the combined binocular implantation of +2.75 D and +3.25 D full-diffractive multifocal intraocular lenses.
The investigators aim to investigate the impact of mandating on-site pre-admission testing on cataract cancellation rates in a randomized, prospective, intervention study. Cataract extraction is the most commonly performed ocular surgery making surgical training an integral component of ophthalmology residency. Patient cancellation of surgery results in a financial burden to the institution and a loss of essential educational experiences for the residents. An earlier study explored variables impacting cancellation rates and identified incomplete pre-admission testing as a major contributing factor to surgery cancellation. Patients will be randomized to either 1) the intervention group where on-site pre-admission testing will be mandated or 2) the control group, where on-site pre-admission testing will be offered but not mandated. Cancellation rates will be collected prospectively and statistical analysis utilized to evaluate the significance of intervention.
Rapid advances of cataract surgery techniques and intraocular lens (IOL) technology have enabled the transition of cataract surgery from blindness relief to refractive correction. An ideal IOL is the critical component to achieve the refractive target of cataract surgery. Biocompatibility, rate of posterior capsule opacification (PCO) and visual quality have all been suggested as the critical factors of an ideal IOL and widely investigated. Recently, stability of IOL position has also been suggested as one of those critical factors due to its close correlation with postoperative visual function. Data suggests that IOL forward movement of 0.29 mm along the visual axis is associated with -0.4D myopic shift. Wang and colleagues recently reported that 0.5mm decentration of an aspheric IOL could eliminate its aberration-correcting effect. Poor stability could even lead to IOL exchange, an additional surgery that put both surgeons and patients in pain. As the supporting element of an IOL, the haptics are crucial to keep the IOL in place. Various haptic designs are being compared in terms of position stability of IOLs. Haptic designs of single-piece versus 3-piece are often compared because they are currently the most commonly used types. Single-piece IOLs have soft and broader haptics which are made of the same material as the optic, usually hydrophobic or hydrophilic acrylic, whereas 3-piece IOLs have rigid haptics which are made of poly methyl methacrylate (PMMA). Clinical studies comparing these haptic designs have yielded controversial results regarding their position stability in the capsular bag, which is the most recommended site for IOL fixation in an uneventful cataract surgery.
To compare refractive outcomes and patient's visual quality after bilateral cataract surgery when implanting multifocal intraocular lens, monofocal with monovision or hybrid monovision.
Congenital cataract is an important treatable cause of visual handicap in childhood throughout the world. Successful management of childhood cataract is dependent on individualized treatment strategies and rigorous postoperative supervision for adverse complication. In this trial, we aimed to compare the difference of postoperative outcome between surgical timing at age of 3 month and 6 month. Patients enrolled into the study will be followed for two year and will have study visits at 1 day, 1 week, 1 month, 3 month, 6 month, 9 month, 12 month, 18month and 24month postoperatively.
This study will examine patient satisfaction and spectacle independence using a survey in patients who have undergone uncomplicated cataract surgery with a presbyopia-correcting lens at least 2 years prior to administration of the survey.
The purpose of this study is to evaluate superior efficacy of DE-108 ophthalmic solution to that of Levofloxacin 0.5% ophthalmic solution as well as safety of the former used for perioperative bacteria eradication in patients who are scheduled for cataract surgery.
To evaluate the safety and efficacy of ocular iontophoresis with dexamethasone phosphate ophthalmic solution, EGP-437®, using the EyeGate® II Drug Delivery System (EGDS) in patients having undergone cataract surgery with implantation of a posterior chamber intraocular lens (IOL)