What does ght outside normal limits mean?
The GHT is described as “outside normal limits” when differences between a matched pair of corresponding zones exceeds the difference found in 99% of the normal population, or when both members of a pair of zones are more abnormal than 99.5% of the individuals with the normative population.
What is the normal range for a glaucoma test?
The test requires eye drops that anesthetize the eye, while a small device touches the eyeball to test the eye pressure. According to the Glaucoma Research Foundation, the range for normal pressure is 12 – 22 mm Hg. When the pressure exceeds 22 mm Hg, that usually indicates an abnormal glaucoma test.
What is the glaucoma Hemifield test?
The glaucoma hemifield test (GHT) provides assessment of the visual field where glaucomatous damage is often seen. It compares five corresponding and mirrored areas in the superior and inferior visual fields.
How do you assess for glaucoma?
In assessing your glaucoma, the ophthalmologist will dilate your eyes so that he or she can get a magnified, 3D view of your optic nerve. This helps to determine the status of your optic nerves and glaucoma. He or she will assess the shape, color, depth, size, and vessels of the optic nerve.
What does ght borderline mean?
GHT borderline is displayed when the p value is between 1% and 3%. Generalized depression indicates that the most sensitive test points are less than 50% of normal. Abnormally high sensitivity is a red flag and indicates low reliability (usually associated with a high rate of positives).
What does ght mean in eye test?
We have developed an algorithm, the Glaucoma Hemifield Test (GHT), for automated evaluation of single static threshold visual field test results in glaucoma.
What is normal range for eye pressure?
Normal eye pressure ranges from 12-22 mm Hg, and eye pressure of greater than 22 mm Hg is considered higher than normal. When the IOP is higher than normal but the person does not show signs of glaucoma, this is referred to as ocular hypertension.
What is normal pressure glaucoma?
Normal-tension glaucoma (NTG), also known as low tension or normal pressure glaucoma, is a form of glaucoma in which damage occurs to the optic nerve without eye pressure exceeding the normal range. In general, a “normal” pressure range is between 12-22 mm Hg.
What is a Hemifield test?
The Glaucoma Hemifield Test compares points in the upper field to corresponding points in the lower field and then interprets the results as (a) “outside normal limits” indicating the upper and lower fields are different and may signify glaucoma, (b) borderline, and (c) within normal limits indicating glaucoma may not …
What is a Hemifield?
Medical Definition of hemifield : one of two halves of a sensory field (as of vision) the parts of each visual hemifield that can be seen with both eyes— R. W. Guillery.
What is normal eye pressure for glaucoma?
What is the normal pressure in the eye?
Eye pressure is measured in millimeters of mercury (mm Hg). Normal eye pressure ranges from 12-22 mm Hg, and eye pressure of greater than 22 mm Hg is considered higher than normal. When the IOP is higher than normal but the person does not show signs of glaucoma, this is referred to as ocular hypertension.
How to predict glaucoma hemifield test results?
Reversal of Glaucoma Hemifield Test Results and Visual Field Features in Glaucoma Using VF features may predict the GHT results reversal to WNL after 2 consecutive ONL results. Using VF features may predict the GHT results reversal to WNL after 2 consecutive ONL results.
Is there an automated visual field test for glaucoma?
We have developed an algorithm, the Glaucoma Hemifield Test (GHT), for automated evaluation of single static threshold visual field test results in glaucoma. The GHT uses empirically determined limits of normality for up-down differences in the Statpac probability maps of the Humphrey Field Analyzer … Glaucoma Hemifield Test.
How are test results determined for glaucoma patients?
Some preliminary factors are important in determining the test results, and among these are the patient’s age and visual acuity (which for other reasons besides glaucoma may effect results). A patient can see these factors upon examination of the test results output.
How is the GHT used to detect visual field loss?
The GHT uses empirically determined limits of normality for up-down differences in the Statpac probability maps of the Humphrey Field Analyzer to detect localized visual field loss. It is also constructed to detect field loss that is symmetric around the horizontal meridian.