By GR Reddy
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Extra info for A Visual Evaluation with Automate Devices
Similarly if you ask for 30-2 or 24-2 central field test in advanced cases of glaucoma the printouts will not give any information regarding macular split as these test patterns will not contain any test points with in 3° around fixation point. The fourth situation (followup cases of glaucoma): In followup cases of glaucoma the selection of the test depends upon the previous test pattern and the selection of the testing strategy is always same as previous test strategies. SELECTION OF TESTING STRATEGY The selection of testing strategy does not depend on the cup/disc ratio of glaucomatous optic atrophy unlike the selection of the point pattern.
Indicators were developed to express localized field defects and overall severity of field loss. These indicators help to pick up the defects at an early stage and also to pick up even the mild progression in the disease process and probability plots were developed to show the field defects in scotomatous form. For example, in single field analysis printouts, pattern standard deviation (PSD) was developed to express the irregular loss of retinal sensitivity (localized field defects). The mean deviation index (MD index) was developed to express overall severity of field loss.
It only tells that the retinal sensitivity at that point is seen in one in two hundred normal population of the patients age group. Because it is seen in one in two hundred normal population and clinically we are suspecting abnormality at that location we presume that point is abnormal or diseased. The global indices which include mean deviation index and pattern standard deviation values are also expressed interms of their P values. For these P values no symbol is given. CLASSIFICATION OF VISUAL FIELD PRINTOUTS 43 ZONE 6- TOTAL DEVIATION PROBABILITY PLOT STATPAC calculates the P value of each decibel deviation in the total deviation numerical plot.
A Visual Evaluation with Automate Devices by GR Reddy