A visual field test measures a person’s whole scope of vision. This includes both the central and peripheral, or side, vision. These tests map the individual fields of the eyes. Visual field testing requires the patient’s full cooperation, as he or she must understand the test that is ...
An optometrist typically uses confrontation visual field testing to determine if further field testing is required. In confrontation testing, one eye is covered and the other focuses on a target object. The optometrist then asks the patient to describe what is seen in the side field of vision. ...
The area that you can see at one time without moving your eyes is called your field of vision or visual field. It may seem quite basic, but being able to name, analyze, and understand your field of vision is important in a medical setting. Visual field tests can help your doctors ...
While working in your office one afternoon you see two patients with visual field loss. The first is an 82-year-old with a longstanding history of primary open angle glaucoma in both eyes. There is advanced glaucomatous cupping, and the intraocular pressure is stable at 16 mm Hg OU on ...
Defect, in this sense, means an ability that is partly defective. Blindness is not considered a field vision defect. This is because blindness tends to involve complete inability. It is possible for a person to have a visual field defect without realizing it. This can cause the person to ha...
Refraction Testing When you go to the eye doctor to get a corrective lens prescription, this test is done to ensure your prescription is exact. The doctor uses a phoropter instrument for this test. They put it in front of your eyes while showing you a variety of lens choices. You tell ...
field of view (FOV) Field of view (FOV) is the open, observable area a person can see through their eyes or via an optical device, such as a camera. In the case of optical devices, FOV is the maximum area that the device can capture. In other words, it answers the question: "...
When used as a screening test, we are satisfied when subjects reach this level and feel no need for further investigation, even though the average visual acuity of healthy eyes is 20/16 (1.25) or 20/12(1.6)4. What is the proper testing distance?
Testing forglaucomatypically begins with measuring the pressure inside your eyes. A common glaucoma test is the "puff-of-air" test, technically known as non-contact tonometry, or NCT. For NCT, the test begins with you putting your chin on the machine's chin rest. While you look at a lig...
Console.WriteLine is a Sub procedure (void, in C#), so it doesn’t return a value, which is why the compiler gives an error. To deal with this, Visual Basic 2010 introduces support for statement lambdas, which are lambdas that can contain one or more statements: Copy Array.ForEach(cus...