Active clinical trials for "Vision Disorders"

Non-invasive brain stimulation can increase cortical excitability in the visual system, but it is not known if this is of clinical value. The investigators now assessed if repetitive, transcranial alternating current stimulation (rtACS) can improve visual field size in patients with optic nerve damage. The investigators hypothesized that rtACS would improve visual functions with the defective visual field sectors of the visual field (primary outcome measure).

The purpose of the current study was to compare the visual performance after bilateral implantation of the Panoptix IOL , or the AT LISA IOL or Tecnis Symfony IOL . The focus was on intermediate vision, defocus curves, and contrast sensitivity.

Over 1 million people in the UK suffer from untreatable visual impairment, many of them elderly. The major complaint of visually impaired people is their inability to carry out simple tasks, especially those involving reading. It is known that this activity limitation is a major cause of depression in an older population, and it is reflected in reduced quality of life. Low vision clinics, mostly based within hospital ophthalmology departments, dispense optical magnifiers to allow patients to carry out these tasks again, but these devices do have limitations (unusual posture, short working distance, monocular viewing). Although electronic magnifiers have been around since the 1960s, they were initially very large and expensive. Recent advances in technology have brought about an explosion in the number and range of portable and moderately-priced aids, which can be used binocularly, in a natural working position: these are currently not available through the NHS. Evidence is needed as to whether these portable hand-held electronic magnifiers could offer a significant benefit to the majority of patients, and therefore whether they should be routinely dispensed in low vision clinics. The proposed study is a two-arm randomised crossover trial with existing users of optical magnifiers being assigned to use a hand-held electronic magnifier in addition to their existing devices for 2 months. Reading and task performance will be measured with the aid, and compared to the performance with optical aids, and the patient will be asked to report on the comparisons between the aids.

The purpose of this study is to demonstrate that two investigational treatment regimens have the potential to result in a superior visual acuity improvement as compared to a ranibizumab pro re nata (PRN=as needed) treatment regimen.

Patients with parkinson disease (PD) usually reduced the dose the levodopa after received deep brain stimulation (DBS). However, studies seldomly mentioned about the influences on non-motors systems after the reduction. Our study focused on the changes after DBS and attribute them to the levodopa variety.

This is a pilot evaluation to assess the feasibility of using novel imaging process to characterize lens edge and limbal epithelial thickness profile; lens movement with gaze and blink; and conjunctival microvasculature including fractal analysis of microvascular perfusion maps and blood flow velocity.

The purpose of this investigation is to evaluate the short-term, clinical performance of two silicone hydrogel daily disposable contact lenses.

This study is being conducted to evaluate Bausch & Lomb PureVision Multi-Focal contact lenses compared to the Bausch & Lomb SofLens59 contact lens when worn by adapted soft contact lens wearers on a daily wear basis.

This study is a prospective, randomized, double-masked, bilateral, dispensing, parallel-group clinical trial design. All subjects will participate in a 2-week daily disposable contact lens adaptation period prior to being randomized into one of the four extended wear lenses. The study has a total of 9 scheduled study visits and a total duration of ~197 days. The lenses will be replaced with a fresh pair after 6 nights / 7 days of wear.

Mobile electronic devices (MED) including, smartphones and tablets, offer a new type of assistive technology for visually-impaired people (VIP). They offer the possibility to replace optical magnifiers for those with mild impairment, and braille or auditory for those with severe visual loss, using standard consumer devices, which are relatively cheap and convenient. However not all VIP and rehabilitation professionals are familiar with the devices and their potential. In this study VIP who are interested in purchasing a MED will be recruited and trained. The effectiveness of this training will be determined by assessing the usage of devices by the participants from completion of training to 6 months, using questionnaires, and by remote monitoring of their MED. Validated questionnaires will be used to measure changes in quality of life, depression, adaptation to vision loss, and ability to carry out everyday tasks, before and after training, and 6 months later. Ongoing support has been found to be important when introducing users to new technology, in the form of volunteers to provide assistance and advice. The standard "training course only" model will therefore be compared to a scheme in which each participant is paired with a "buddy" (a university student) who can provide continuing support by visiting the VIP regularly at home.