Active clinical trials for "Glaucoma"

Hypothesis: Changing to Travatan Z therapy increases the tear film break up time of subjects on Xalatan therapy presenting with ocular surface disease.

Demographic information and a brief medical and concomitant medicine history will be obtained from the glaucoma patient's records. Qualified patients will be asked to complete a questionnaire about their symptoms. Patients will then be scheduled to undergo three standard clinical tests of the ocular surface.

This study will investigate congenital or developmental eye abnormalities that affect the iris, cornea and lens, and are usually accompanied by elevated pressure within the eye. These disorders can cause vision loss, and the increased eye pressure can lead to glaucoma, a condition that may also cause loss of eyesight. Patients with eye anterior chamber eye disease, such as Axenfeld's syndrome, Rieger's anomaly, Peter's anomaly, iridocorneal endothelial syndrome, megalocornea, ocular hypertension, and others, are eligible for this study. Participants will have a medical examination, family history, and comprehensive eye examination. Tests and procedures may include photographs of the cornea, iris, and the structure through which fluid that normally circulates behind the cornea drains out of the eye. Some patients may undergo indentation tonography to measure how easily this fluid drains. In this procedure, the patient lies on an examination table and both eyes are numbed with eye drops. A small instrument (tonometer) is placed on the surface of one eye, and with the other eye, the patient looks at an overhead light. Other tests may include photographs of the back of the eye and ultrasound imaging of the structures of the eye. A blood sample may be drawn to study the genetic disorder responsible for the disease. Patients will have follow-up examinations every 6 months for the duration of the study. Medical or surgical therapy will be recommended, as appropriate, for patients who develop elevated eye pressure or vision loss.

In this prospective device comparison study with 58 healthy eyes, the Topcon CT-1® showed statistically significant elevated intraocular pressure measurements compared to the gold standard Goldmann application tonometry.

The investigators would like to know if different imaging devices can improve the quality of images and visualization of imaged tissues. Also, the investigators would like to find out whether these changes are useful in the diagnosis and treatment of eye diseases. Using images of previous participants will allow us to demonstrate the advancement of different technologies, as well be used to allow comparisons between current technologies.

Self-tonometry with iCare Home is performed by one hundred patients annually at Sankt Erik's Eye Hospital. The investigators want to evaluate the impact that self-tonometry results have on the clinician's choice of glaucoma treatment. The investigators also want to evaluate how often pressure peaks occur outside the clinic's opening hours.

Self-tonometry with iCare Home is regularly performed at Sankt Erik's Eye Hospital since a few years back. The purpose of this study was to show that the eye pressure measurements made with iCare® Home by patients / relatives do not vary more than those made with the standard method, Goldman applanation tonometry (GAT), by different healthcare professionals. This will hopefully confirm the usefulness of self-tonometry.

The aim of the present study was to examine and measure SFCT and CCVD using respectively EDI-OCT and OCTA in preperimetric and advanced glaucomatous eyes, in order to shed light on the vascular pathogenesis of glaucoma disease.

Evidence has accumulated that systemic and ocular mechanisms, responsible for regulating blood flow in the area of the optic disc, such as reduced ocular perfusion pressure, abnormal autoregulation and vascular dysregulation may be involved in the pathogenesis of normal tension glaucoma (NTG). Defective cardiovascular neuroregulation has been advocated as a possible one of the main systemic contributing factors in the etiology of NTG. Based on the results of previous studies, the hypothesis has been posed that patients with NTG have an impaired diurnal heart rate variability (HRV) or high activity of the sympathetic component of autonomic nervous system (ANS) and endothelial dysfunction. Impaired balance of ANS, resulting in increased demand for oxygen in the tissues and subsequent low threshold of hypoxia in all organs (including the eye) can be an important link in the pathogenetic pathway of NTG, making the optic nerve more sensitive to small and short-term changes in perfusion pressure and prone to damage even under a statistically "normal" intraocular pressure (IOP). The aim of this study is to evaluate the activity and characteristics of the following systems: the central ANS (through a 24-hour analysis of heart rate variability and blood pressure), peripheral vascular system (through the analysis of the post-occlusive hyperemia reaction within the distal part of left upper limb) and the local retrobulbar circulation as measured by color Doppler imaging (CDI) in patients with NTG and healthy volunteers. The correlations between all above systems, as well as between them and the structural and functional parameters of the optic nerve, and the retina in both groups will be also analyzed.

A single-nucleotide polymorphism (SNP) analysis of DNA obtained from peripheral blood of the glaucoma patients and the normal control will be performed to find genetic marker for primary open angle glaucoma.