By GR Reddy
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Additional info for A Visual Evaluation with Automate Devices
This method is used in full threshold strategy. 24 A VISUAL FIELD EVALUATION WITH AUTOMATED DEVICES DETERMINATION OF THRESHOLD During determination of threshold at each point in the test grid, stimulus intensities will vary in such a way that some stimuli will be suprathreshold (brighter than necessary to elicit a response most of the time) and some will be infrathreshold (too dim to elicit a response most of the time). Threshold is thus bracketed by the stimuli as the examination proceeds. This method of bracketing is also known as staircase method for determining threshold.
So we go for 24-2 point pattern. ) The third situation (advanced cases of glaucoma): In this situation our aim is to know how much central field is retained around the fixation spot. For this we have to go for 10-2 point pattern. ) When the patient has advanced glaucomatous optic atrophy the first thing we should do is to test the central 10° field. The central 10-2 consists of 68 test points with 2° resolution. If the field defect is so advanced that most points have sensitivity less than 10 to 15 decibels, it is then preferable to use macular program.
Thus by elevating the retinal sensitivity at each point, the P value of each point is changed. Some point’s P value becomes non significant. 5%. So the total deviation numerical plot is converted to pattern deviation plot to highlight those points, which have significant P value even after elevating the retinal sensitivity by dB value which converts the 7th best retinal sensitivity point of total deviation numerical plot to normal. The pattern deviation numerical plot is also the basis for glaucoma hemi field test analysis.
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