Active clinical trials for "Macular Degeneration"

In industrialized nations diabetic retinopathy(DR) is the most frequent microvascular complication of type 2 diabetes mellitus and the leading cause of visual impairment and blindness in the working-age population. The well-accepted strategy for prevention and treatment of diabetic eye complications focused on confirmed diabetic retinopathy, diabetic macular edema, cataract, etc, and there was no definitive therapy for preclinical central visual acuity (CVA) impairment, mainly because of its unknown pathogenesis. In our previous population-based study, the prevalence rate of early CVA impairment was as high as 9.1%, and that obviously limits the effects of diabetic eye diseases prevention and early-stage treatment strategy. Of note, the choriocapillaris is the only route for metabolic exchange in the retina within the foveal avascular zone, it was speculated that early CVA impairment is related to diabetic choroidopathy (DC). Recent research shows that the decreased macular choriocapillaris vessel density (MCVD) in diabetic eye ,which indicating early ischemia, is already present before diabetic macular edema can be observed; we have observed subfoveal choroidal thickness (SFCT) decreased significantly in the early CVA impairment patients. However, up til now, there was no epidemiology report on early CVA impairment in Chinese diabetes population. In the present study, we plan to conduct a 10-year perspective cohort observation of 2217 Chinese type 2 diabetic residents without diabetic retinopathy, diabetic macular edema, cataract and other vision impairing diseases, trying to find out related physical and biochemical risk factors. The results will facilitate discriminating high risk groups of early CVA impairment in diabetic patients. In the same time, a quantitative relationship between SFCT change, MCVD change and CVA change will be established. This study will demonstrate the role of DC in the occurrence of preclinical CVA impairment, and provide important theoretic evidence of blocking agents which target on DC.

Studying the morphology and function of the normal and diseased retina in vivo is needed for advancing the detection, diagnosis, and treatment of retinal disease. This protocol uses an adaptive optics scanning laser ophthalmoscope (AOSLO) to image the normal and diseased retina with individual cellular resolution non-invasively. The primary objective of this study is to obtain and analyze high-resolution images of the retina, in particular by imaging the cone photoreceptor mosaic, the retinal vasculature and other retinal layers. The study design will involve case-control studies, where cases are followed over time. Subjects age 7 and older may be invited to participate. The main research procedure involves retinal imaging with the AOSLO. The primary endpoint is the observation of differences in retinal images between subjects with and without retinal diseases. These changes will be quantified by examining the cell density, size, spacing and regularity of the cone photoreceptor mosaic, as well as examining the differences between other retinal layers.

Background: Macular degeneration can cause permanent loss of central vision. This vision is important for seeing details. Age-related macular degeneration (AMD) is the leading cause of vision loss in people over 55 in the United States. Researchers want to follow people with AMD to study the early to middle stages of the disease. Objective: To follow for another 5 years participants who completed NIH study 11-EI-0147. Eligibility: Participant was enrolled in and completed study 11-EI-0147. Design: Participants will have at least 6 study visits over 5 years. Each visit takes about 5 hours. At visit 1, participants will be asked about their medical and eye disease history. They will have an eye exam. The exam will test vision, eye pressure, and eye movements. The pupil will be dilated with eye drops. Participants will have baseline exams. These include a health history and questions about problems that affect their eyes under different lighting. They will answer these questions each year. At each visit, participants will have some or all of these tests: Eye exam Dark adaptation protocol. This measures how fast the eyes recover when exposed to decreasing levels of light. The pupil will be dilated with eye drops. Participants will sit in front of a metal box with a camera inside. They will push a button when they see a light in the machine. View a bright background light for 5 minutes. After the light is turned off participants will push a button when a blue or red light is seen. Sit in the dark for about 30 minutes. Participants will push a button when they see a blue or red light.

This clinical trial aims to test the safety and feasibility of using a non-invasive ultrasound device to stimulate retinal nerve cells and restore vision in patients with age-related macular degeneration. Previous studies have shown that artificial stimulation, such as electric and optic stimulations, can partially restore vision, but these methods are invasive and pose surgical risks. The study aims to develop a non-invasive method for retinal stimulation. The investigators will follow the FDA guidelines to limit the ultrasound power and adhere to all clinical trial regulations to ensure all participants' safety. The main questions the investigators aim to answer are: Is using high-frequency ultrasound safe using a wearable device for localized retinal neural activity stimulation? Does the stimulation through the device restore vision in patients with age-related macular degeneration? Participants in this study will be asked to undergo Optical Coherence Tomography (OCT) scanning before and after the ultrasound stimulation to evaluate the device's safety. Then, they will receive five stimulation-rest cycles and complete a questionnaire to report what they see and how they feel during the device's operation.

Evaluation if a computer-based tutorial ("MacInfo" tool) improves the patients' knowledge about intravitreal drug injections, associated risks, and the underlying diseases of treatment-naive patients.

The purpose of this study is to compare the results of vision tests that are algorithmically derived and delivered through a virtual reality headset with those delivered through the existing technology standards (eg. Humphrey for field tests). Tests that the researchers will be conducting include vision field perimetry, Amsler, acuity chart, contrast- sensitivity and currently used office tests.

PNV is a recently described clinical entity; therefore, studies about treatment efficacy and safety are few, with limited follow-up and a small number of participants. Treatment is based on intravitreal anti-VEGF injections, similar to neovascular AMD. According to reported results however, efficacy seems different in fluid reabsorption among anti-VEGF agents. A newly developed anti-VEGF molecule for the treatment of neovascular AMD, brolucizumab, has been shown in clinical studies to have longer durability and improved visual outcomes using a q12-week regimen, thus having the potential to reduce treatment burden and serve as an important therapeutic tool in the management of neovascular AMD. Nevertheless, there have been no reports specifically focusing on the efficacy of brolucizumab in the treatment of PNV. The purpose of this study is to evaluate the efficacy and safety profile of the modified treat-and-extend regimen to 64 weeks by intravitreal brolucizumab injection in eyes with treatment-naive pachychoroid neovasculopathy (PNV) patients.

This open-label study is being conducted to evaluate the initial safety and tolerability of BBC1501 IVT in patients with nAMD. The primary objective of this study is to evaluate the safety and tolerability of 3 ascending doses of IVT BBC1501 in patients with nAMD. The secondary objective of this study is to exploratory of BBC1501 efficacy following 3 ascending dose of BBC1501 in nAMD patient.

An observational study to evaluate different biomarkers of subjects with geographic atrophy secondary to age-related macular degeneration

Home optical coherence tomography- guided treatment versus treat and extend for the management of neovascular age-related macular degeneration.