By GR Reddy
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Extra resources for A Visual Evaluation with Automate Devices
Suppose by mistake if the age of the patient is wrongly entered but all the other parameters are normal and the reliability indices are excellent what is your reaction? Do you ignore the test completely? The answer is no, because the raw data that is obtained is correct. Only the raw data and the gray scale will be taken into consideration because these two results depend on patient’s response to the stimuli. Because the correct raw data is compared to the mean normal values of different age groups (because the date of birth of the patient is wrongly entered) the decibel deviation at each point plotted in total deviation numerical plot is inaccurate.
Localized loss and the relative rate of change of each can be quantified and then reduced to a simple number, the clinician can assess valuable information about each of these parameters at a glance. The basic global field indices 1. Mean deviations (MD) 3. Pattern standard deviation (PSD) 2. Short term fluctuation (SF) 4. 13 To understand global indices we should have clear concept on hill of vision. In the normal visual field the fovea is the highest retinal sensitivity point. So the peak of the hill of vision is represented by the fovea and retinal sensitivity decreases as it moves away from the center (fovea) to the periphery.
Test pattern : Central 30-2, 24-2, 10-2 Test strategy : SITA standard, SITA fast, Full threshold, FASTPAC Stimulus size : III Fixation target : Central, small diamond, big diamond Foveal threshold : On or off. Fluctuation : On or off First, we will discuss in detail the single field analysis printout with STATPAC analysis. Later we will talk about printouts without STATPAC analysis and follow-up tests. CLASSIFICATION OF VISUAL FIELD PRINTOUTS 31 UNDERSTANDING OF SINGLE FIELD ANALYSIS PRINTOUT We deal with interpretation of Humphrey field analyzer’s printouts, since it is the instrument we use in our clinical practice.
A Visual Evaluation with Automate Devices by GR Reddy