Active clinical trials for "Glaucoma"

The purpose of this study is to learn how pigment is released from the iris (the colored part of the eye) in patients with pigment dispersion syndrome. It will do this by examining the response of the pupil (the central opening of the iris) to a flash of light to determine what is happening in the iris to cause release of the pigment. In pigment dispersion syndrome, pigment released from the iris is deposited in other parts of the eye, including the trabecular meshwork-a filter-like tissue in the front of the eye. Aqueous fluid (fluid continuously produced by the eye) normally flows out of the eye through the trabecular meshwork. In some patients, the pigment deposits may block tiny holes in the meshwork, preventing the fluid from flowing out. This can cause an increase in eye pressure that may lead to glaucoma and some loss of vision. Understanding how pigment is released from the iris may help predict the course of pigment dispersion syndrome and identify which patients will likely develop increased eye pressure. Patients with pigment dispersion syndrome and normal volunteers may be eligible for this study. All participants will have the following procedures, which will be completed in two clinic visits: First visit Examination of the front of the eyes, including the cornea, iris and lens. Vision testing and measurements of visual field and eye pressure. Examination of the trabecular meshwork. For this test, a contact lens is placed on the eye after the eye has been numbed with anesthetic drops. Second visit Refraction (dilation of the pupils with drops) and examination of the back of the eyes, including the optic nerve. Reaction of the pupils to low-level infrared light (pupillography). During this 15-minute test, the patient or volunteer wears a lightweight headband with two small cameras mounted on it. The cameras-one which views the eye and the other the subject's field of view-record pupil dilation and position. The test results in patients with pigment dispersion syndrome will be compared with those in normal volunteers. Patients will be followed every 6 months (or more often, if medically indicated) during the 3-year study to determine changes in eye pressure or visual field. Volunteers will be asked to return about once a year for 3 years for repeat pupillography.

Worldwide, glaucoma is the most common cause of irreversible blindness. The major risk factor is raised pressure within the eye (intraocular pressure, IOP). IOP is typically measured using Goldman applanation tonometry (GAT). This involves instilling anaesthetic eye drops and using a probe to contact the cornea and obtain a pressure measurement. A major disadvantage of GAT is that only limited numbers of pressure measurements can be obtained, whereas IOP is known to vary throughout the day and in ¾ of people is highest during the night. The result is that clinicians have poor understanding of patient's 24 hour IOPs and the effect that this might have on their glaucoma. This is a serious limitation as the treatment of glaucoma depends on lowering IOP. Recently a new device has become available, designed specifically for home IOP monitoring. The iCare HOME tonometer is a CE marked commercial device (http://www.icaretonometer.com/products/icare-home-tonometer/) that can be used to gain insight into 24-hour IOP fluctuations. We wish to determine the feasibility of home IOP monitoring using this device. The iCare HOME tonometer depends on the patient performing self-tonometry. Testing one's own IOP may be technically difficult and it is likely that large numbers of patients will struggle with this.

Glaucoma is a very frequent disease in Brittany. In glaucoma the retinal ganglion cells and their axons slowly die with visible changes at the optic nerve head (cupping). Without early diagnosis and effective treatment or with delayed treatment decrease of visual acuity or blindness become. In secondary pseudoexfoliation glaucoma grayish-white deposits of abnormal proteins are found on all surfaces of eye irrigated by the aqueous humor. The deposits of PEX material inside the trabecular meshwork decrease aqueous humour outflow and the intraocular pression raise. The exfoliation material is found on the surface of the lens capsule with frequent developement of nuclear cataract . After cataract surgery the intra ocular pressure (IOP) decrease. Some recent study have found decreasing ocular volume variation associated to IOP fluctuation in night after cataract surgery in normal pressure glaucoma patients. In our study we want see if it's the same thing in pseudoexfoliation glaucoma patients.

Establish electrophysiological benchmarks, using the Diopsys Visual Evoked Potential/ Pattern ERG (VEP/PERG) protocols of populations with Glaucoma following: 1) Baseline VEP/ERG prior to treatment; and 2) VEP/PERG after treatment.

Post-operative fibrosis of trabulectomy blebs is a major cause of surgical failure leading to a renewed increase in intraocular pressure. The use of anti-metabolites over many years has made it possible to improve success rates for this surgery but these drugs have numerous adverse effects as they are toxic. Alternative therapies are thus necessary, and we believe that DHA could have antifibrotic effects on fibroblasts and could thus improve success rates in this surgery.

Background : Glaucoma is a common disease, potentially blinding, characterized by progressive damage to the optic nerve. If the intraocular pressure is the most known risk factor, however, there are cases of glaucoma scalable despite well-controlled intraocular pressure, ocular hypertension without glaucoma or glaucoma without ocular hypertension (normal tension glaucoma). Purpose :Involvement of vascular factors in the development of glaucoma and scalability has been proved, associated with a possible loss of vascular autoregulation. The objective of this study is to quantify MRI flow of blood flows referred ophthalmic patients with glaucoma untreated comparison with control subjects.

The objective of this study is to develop and test the psychometric properties of a self-report questionaire, the Glaucoma Visual Functioning Questionnaire-40 (GVFQ-40), which was designed to measure the difficulty of daily activities of glaucoma patients and evaluate the effectiveness of clinical treatment or rehabilitation interventions.

This study is interested in monitoring how patients take eye drops, both through video-recordings and adherence monitoring, as well as their perceptions about their eye medications; including the dosing schedules, instillation techniques and effect on their disease.

It is suggested the pathogenesis of normal-tension glaucoma (NTG) involves vascular dysregulation. In the past studies, it is well documented that many physical problems related to vascular dysregulation, such as angina pectoris (Friedman M et al 1974; Russek HI et al 1976), migraine (Diener HC et al 1994), primary Raynaud's disease (Wagner HH et al 1993) and stroke (Gainotti G, et al, 2001; Hayee Ma et al 2001), are associated with a high risk of depressive illness. So, NTG, being a disease involving vascular dysregulation, is postulated to be associated with psychopathology. Glaucoma increases after 40 year-old and the number of people over this age in Hong Kong is rapidly growing. However, we have no knowledge about the link between psychopathology and NTG in Hong Kong. The present study is sought to overcome the limitation in previous research and the goals of present study are: To identify the prevalence of psychopathology of normal-tension glaucoma Hong Kong Chinese Out-patients attending a university-affiliated glaucoma clinic. To determine whether there are any differences among NTG patients, patients with glaucoma other than NTG and control in terms of psychopathology and quality of life. Designs: Case-control study to compare among patients with normal-tension glaucoma (NTG), patients with glaucoma other than normal-tension glaucoma (OTNTG) and control in terms of psychopathology and quality of life

Selective laser trabeculoplasty (SLT) is a new method to reduce intraocular pressure in eyes with open angle glaucoma or ocular hypertension. SLT may also be effective for cases with previously failed ALT procedures. We will study the efficacy and safety of the SLT procedure.