What are glaucomatous visual field defects?
Glaucomatous visual field defects are basically comprised of four major patterns: an isolated scotoma, an arcuate scotoma, a nasal step, and generalized depression. The field loss progresses conforming to the optic nerve head and retinal nerve fiber changes.
What are nasal steps?
A nasal step is a relative depression of one horizontal hemifield compared with the other. Damage to superior nerve fibers serving the superotemporal retina beyond the paracentral area resulted in this nasal step.
What is glaucomatous cupping?
Glaucoma is caused by high pressure in the eye damaging the optic nerve, which results in loss of individual nerve cells. This causes a subsequent increase in the size of the cup, also called cupping.
How do you do a visual field test?
During the test, one eye is covered (so that one eye is tested at a time), and you want to always look straight ahead at the steady yellow light. Then, other lights flash one at a time off to the side and you should press the button whenever you see one of these lights.
How is visual field test performed?
In order to find and follow glaucoma, visual fields are measured by a computer one eye at a time. One eye is covered and the patient places his or her chin in a type of bowl. Lights of various intensity and size are randomly projected around inside of the bowl. When the patient sees a light, he or she pushes a button.
How do you examine a visual field?
The automated perimetry test uses a computer program to test an individual’s visual field. You will sit and look into a dome-shaped instrument. Your doctor will instruct you to look at an object in the middle of the dome throughout the test. There will be small flashes of light on the dome.
What is nasal step glaucoma?
In pratical terms, the nasal step is an early characteristic glaucomatous field loss like the isolated scotomas of the Bjerrum area. Unfortunately it can be observed also in normal visual fields and in other pathological conditions. Accordingly, what is nasal visual field?
What are glaucoma visual field defects?
Glaucomatous visual field defects are basically comprised of four major patterns: an isolated scotoma, an arcuate scotoma, a nasal step, and generalized depression. The field loss progresses conforming to the optic nerve head and retinal nerve fiber changes.
What is a nasal step defect?
What is a nasal step visual field defect? In pratical terms, the nasal step is an early characteristic glaucomatous field loss like the isolated scotomas of the Bjerrum area. Unfortunately it can be observed also in normal visual fields and in other pathological conditions.
What are the functional defects of glaucomatous optic neuropathy?
Functional defects of glaucomatous optic neuropathy are reviewed and summarized. Glaucomatous visual field defects are basically comprised of four major patterns: an isolated scotoma, an arcuate scotoma, a nasal step, and generalized depression.