By GR Reddy
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Extra resources for A Visual Evaluation with Automate Devices
MEAN DEVIATION The mean deviation index signifies average overall severity of field loss. In principle, it is the average of all the numbers shown in the total deviation plot except the two points nearer to the blind spot. The deviation from normal at each point is weighed according to the variance of the normal values at that location, Thus points with low variance-that is, closer to fixation-affect the MD value more than eccentric points, which have a higher variance. The mean deviation is expressed in dB units with P value.
24-2 SITA FAST - 5 MINUTES Please see pages 63- 69 for further details on the threshold testing strategies. 26 A VISUAL FIELD EVALUATION WITH AUTOMATED DEVICES IMPORTANT THRESHOLD TESTS TO DETECT GLAUCOMA FIELD DEFECTS Now, we know the available point patterns and the testing strategies. Whenever we ask for a visual field test we have to specify the point pattern and the testing strategy. The usual available central threshold test point patterns are as follows: 30-2 central field, 24-2 central field, 10-2 central field, macular program and nasal step.
The distance between each test point is 2°. The test points straddle the horizontal and vertical axes. The most important point is to be noted in the 10-2 field is, 2° resolution. Because the test points straddle the horizontal and vertical axes, the innermost points are only one degree from the fixation spot. So, only one degree of bare area is left surrounding the fixation spot. From this we understand, most of the central space surrounding the fixation spot is tested in 10-2 field. Hence it became the test of choice in all advanced cases of glaucoma to know about the macular status.
A Visual Evaluation with Automate Devices by GR Reddy