Glaucoma hemifield test
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The document discusses messages from the Glaucoma Hemifield Test (GHT) performed on the Humphrey Field Analyzer. The GHT compares sensitivities between the upper and lower halves of the visual field. An "Outside Normal Limits" message indicates significant differences, while a "Borderline" message means differences are greater than normal but not significant. Other possible messages include "General Depression of Sensitivity" if points are abnormally low or "Abnormally High Sensitivity" if points are abnormally high. A "Within Normal Limits" message means no significance limits were reached.
Glaucoma hemifield test
- 1. Humphrey Field Analyzer II/IIi
- 2. GHT – Glaucoma Hemifield Test
- 3. GHT – Glaucoma Hemifield Test GHT Messages “ Outside Normal Limits” Sensitivities in one or more of the five zones in the upper half of the field are significantly different (p<0.01) from the sensitivities measured in the corresponding zones in the lower half of the field
- 4. GHT – Glaucoma Hemifield Test GHT Messages “ Borderline” Zone pairs differ by an amount greater than is seen in most normal subjects (p<0.03), but the difference does not reach the level required for the “Outside Normal Limits” message.
- 5. GHT – Glaucoma Hemifield Test GHT Messages “ General Depression of Sensitivity” Test point locations are so low as to be at levels seen in only 0.5% of normal subjects. Will not be displayed when sensitivity differences between the superior and inferior hemi-fields are large enough to result in an “Outside Normal Limits” message. “ Abnormally High Sensitivity” Test point locations are so high as to be at levels seen in only 0.5% of normal subjects.
- 6. GHT – Glaucoma Hemifield Test GHT Messages “ Within Normal Limits” Presented when none of the previous significance limits have been reached.