Visual field Test for Glaucoma Screening
Glaucoma is an eye disorder in which the optic nerve of the affected eye(s) suffers permanent damage, and progressing to complete blindness if untreated. Glaucoma is often, but NOT always, associated with increased pressure of the fluid in the eye. The term 'normal' or 'low tension glaucoma' is suggested for the typical visual field defects when associated with a normal or low IOP.The nerve damage involves loss of retinal ganglion cells. Raised intraocular pressure is a significant risk factor for developing glaucoma (above 21 mmHg or 2.8 kPa). One person may develop nerve damage at a relatively low pressure, while another person may have high eye pressure for years and yet never develop damage. Untreated glaucoma leads to permanent damage of the optic nerve. and resultant visual field loss, which can progress to blindness. Visual field loss loss occurs gradually over a long period of time, and is often recognized only when the disease is quite advanced.
Glaucoma is a major cause of preventable - progressive blindness. Of every 30 people over the age of 50, one will be affected by glaucoma, nearly half of those do not know they have the disease. Most patients with early glaucoma have normal vision and enjoy a healthy and productive lifestyle despite advancing disease.
The visual field test test will help you become aware of any significant defects in your visual field. You can use it to test your visual fields in your own home. This visual field test is convenient, inexpensive (free), fast and easy to use. It will help you detect visual fields / glaucoma defects early. The 5-minute self-test is is a virtual perimetry system, which you can run at your home computer. It can reveal changes in your visual field and glaucomatous damage. It is a powerful tool for self-care but you have to practice to get this field test right. The test it is only available for the Windows operating system.
Screening vs. Diagnostic methods: Screening tests are fast methods used only to detect a defect in the visual field. A diagnostic test is usually much more time consuming and is used to "characterize" defects. The confrontation field test is a screening test. Manual and automated perimeters use screening protocols that test a limited number of points or meridians in specific patterns dependent upon what type of defect is suspected. Visual field testing is not part of a routine eye exam (with the exception of the confrontation VF). Screening tests are performed in response to the probability of a field defect being present in a specific disease process, or in response to a patient complaint.
The test results are classified according to one of three categories: a) normal b) moderate defect c) advanced defect.
The purpose of the test is only to detect signs of visual field loss - glaucoma, not to quantify the defects, the test is not a substitution for a medical exam with an eye care professional. The software allows you to email your test results to your doctor.
Monitor requirements : min 19", 22" or more (recommended)
The use of the software is free. You can download the software here .