By GR Reddy
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Additional info for A Visual Evaluation with Automate Devices
The next step is the conversion of TDNP to pattern deviation plots to highlight the local field defects masked by generalized depression. STATPAC corrects the total deviation plot for diffuse loss, raising or lowering the overall height of the island of vision towards the mean for the reference population, and displays the results as the pattern deviation numerical plot. The STATPAC calculates the P value of each corrected decibel deviation in the pattern deviation numerical plot. And thus each deviation value in the pattern deviation numerical plot is converted to symbolic form according to its P value and plotted as pattern deviation probability plot.
Usually we ask for visual field testing in cases of glaucoma in four different situations. The first situation (suspicious cases of glaucoma): In this condition we want to know whether there is a field defect or not. So in this situation we have to go for central 30-2 point pattern where we have more number of points to be tested and extended over an area of 30°. ) The second situation (established case of glaucoma): In this condition our aim is not to diagnose glaucoma but to know how much field is lost.
20) First stimulus: The first stimulus presented at the point P is seen and hence it is labeled as open circle 1. Second stimulus: Because the first stimulus was seen a intensity of light was dimmed by 4 dB In this example, the second stimulus was also seen and labeled as open circle 2. Third stimulus: As the second stimulus was also seen, the third stimulus was dimmed further by 4 dB. The third stimulus is too dim to elicit a response and hence indicated by closed circle 3. This is the first crossing from seeing zone to nonseeing zone.
A Visual Evaluation with Automate Devices by GR Reddy