How do you read the Humphrey visual field test results?
How do you read the Humphrey visual field test results?
The dBs tested by the Humphrey analyzer range between 0 and 50 dB (0 is the brightest and 50 is the dimmest). A value of 0 means the patient could not see the brightest target, and a 50 means the dimmest target was seen.
What is normal PSD in visual field test?
Pattern standard deviation (PSD) measures irregularity by summing the absolute value of the difference between the threshold value for each point and the average visual field sensitivity at each point (equal to the normal value for each point + the MD).
What is a 24 2 visual field test?
The visual field (VF) pattern most widely used to detect glaucomatous damage, the 24-2 test pattern, does not adequately test the macular region, as the 6° grid of the 24-2 pattern has only four points within ± 8°.
What is the normal range of cup to disc ratio?
about 1/3
The normal cup to disc ratio (the diameter of the cup divided by the diameter of the whole nerve head or disc) is about 1/3 or 0.3. There is some normal variation here, with some people having almost no cup (thus having 1/10 or 0.1), and others having 4/5ths or 0.8 as a cup to disc ratio.
What is the difference between 24-2 and 10-2 threshold VF testing?
By comparison, 10-2 threshold VF testing assesses 68 points, more than five times as many points in the central 10 degrees compared with 24-2 and 30-2 testing.
What is the difference between the 24-2 and 10-2 test grid?
The 24-2 test grid consists of 54 testing points which is relevant for detecting glaucomatous visual field defects, the “peripheral” whereas 10-2 consists of 68 testing points which have been proposed to map out central visual field defects.
What is the difference between a 24-2 and a 10-2?
The 24-2 assesses the central 24° with a 54-point grid; 10-2 assesses the central 10° with a 68-point grid; and 30-2 assesses the central 30° with a 76-point grid.
Does 24-2 visual field testing underestimate central defects?
Central 10-2 visual field testing shows that 24-2 testing underestimates these potential central defects (D and E). Click images to enlarge.
