View clinical trials related to Geographic Atrophy.
Filter by:It has been shown that reactions of human retinal photoreceptors to a light stimulus can be measured with custom-made, research prototype optical coherence tomography (OCT) systems. This can be used as a biomarker for the function of the photoreceptors. Due to the high technical demands on the system, however, the technique is currently not available for clinical purposes. In this pilot study a protocol to measure changes in retinal photoreceptor layer thickness before and after light stimulation shall be developed based on a commercial OCT system and newly developed algorithms. Other variables, such as circadian processes shall be investigated as well. After measurements in healthy volunteers, the protocol is planned to be applied in patients with primary open angle glaucoma (POAG) and age-related macular degeneration (AMD) to test for feasibility of the method in these patient groups.
Age-related macular degeneration (AMD) is an eye disease which causes people to lose their sharp central vision over time. Aging damages the macula, which is in the middle of the retina - the light-sensitive part at the back of the eye. There are 2 types of AMD - wet AMD and dry AMD. The advanced stage of dry AMD causes vision loss. This is known as geographic atrophy. AMD makes everyday tasks like reading or driving difficult. ASP7317 is a potential new treatment for people with AMD. ASP7317 are human stem cells which have changed into cells found in the retina. ASP7317 is injected under the macula. It is hoped that ASP7317 will replace some of the damaged cells in the macula and improve vision for people with dry AMD. Before ASP7317 is available as a treatment, the researchers need to check its safety and how well it is tolerated. They will also check for signs of improved vision. People taking part in this study will be older people who have geographic atrophy caused by dry AMD. This is an open-label study. This means that people in this study and clinic staff will know that people will receive ASP7317. There will be 3 doses of ASP7317. These are low, medium and high numbers of cells. ASP7317 will be injected under the macula after the person is given either a local or a general anesthetic. To prevent the body from rejecting the cells, people will take tablets of tacrolimus a few days before receiving ASP7317 for up to a few weeks afterwards. Other medicines will be taken during this time to stop infections. There will be 2 groups in the study. Group 1 will be people with severe vision loss and Group 2 will be people with moderate vision loss. There will be different small groups of people within Group 1 and Group 2, with each small group receiving 1 of the 3 doses of ASP7317. Different small groups of people within Group 1 and Group 2 will receive lower to higher doses of ASP7317. Each small group will only receive 1 dose. Group 1 will start treatment first. At each dose, a medical expert panel will check the results of the first person in the group to decide if the rest of the group will receive the same dose. Then, the panel will decide if more people may receive the same dose or if the next group may receive the next highest dose. The panel will use the results from the lower dose of Group 1 to decide when Group 2 starts treatment (also at the lower dose). The panel will also use the results of the middle and higher doses in Group 1 to decide when and how many people in Group 2 can receive these doses. During the study, people will visit the clinic several times for up to 12 months (1 year). During all visits, the study doctors will check for any medical problems after receiving ASP7317. Vital signs will be checked a few days before treatment with ASP7317 and up to about a month afterwards. Vital signs include blood pressure, pulse, and temperature. At some visits, the study doctors will also take blood samples for blood tests. At most visits, people will have eye tests and have different images, scans, and measurements taken. This could be for the affected eye or both eyes, depending on the test. People can visit the clinic extra times, if needed.
Given the aging population who will be affected by wet AMD and lack of effective GA treatment, it is crucial to assess the safety profile of repeated ranibizumab injections in AMD patients with GA, particularly the possible risk of GA development and enlargement. This potential adverse effect has significant implication in the discussions with patients regarding the risks and benefits of AMD treatment and injection frequency. While monthly injections provide slight improvement of visual acuity at 2 years (Martin et al., 2012), the risk of GA enlargement may offset this benefit in visual acuity. Previous studies assessed the association between intravitreal ranibizumab injections and de novo GA development in injection-naïve eyes (Martin et al, 2012, Querques et al., 2012., Grunwald et al., 2014), rather than GA enlargement in patients with preexisting GA. To the best of the investigators knowledge, there has been no prospective study assessing the association between intravitreal ranibizumab injections and rate of GA progression in patients with pre-existing GA. There is also no prospective study comparing the morphological features of GA between patients who are receiving intravitreal injections and those who are not, nor the concordance of GA enlargement rate between the 2 eyes among patients receiving and not receiving treatment.
This is a Phase II/III,vehicle controlled, double masked, single center study. A single eye of 60 individuals with mild to moderate non-exudative Age-Related Macular Degeneration (AMD) will be randomly assigned to receive either topical 1% MC-1101 or a vehicle control over 2 years. The study design will assess the efficacy, safety, and tolerability of MC-1101 for these patients. An analysis of the primary and secondary endpoints will be conducted when all subjects have completed Baseline, 1, 3, 6, 12,18 and 24 months.
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.