Dr.Tutul Chakravarti, C05550
This study offers a predictive formula for classifying glaucoma disease severity using the change analysis printout.STATPAC(HFA II 720)gives an analytical summary of changes in protracted visual field through box plot.The box plot, a modified histogram,summarizes total deviation test values for each test.This retrospective chart review studied 13 patients. We examined: the overall shape of the box; the location of median value; the top & bottom endpoints in each case. Mean follow-up was 5 years. Early glaucoma presented typically with long tail (the worst point down >19dB &the15th percentile point down>7dB); in advanced glaucoma all the box plots were consistently tall, 85th percentile was down up to 9 to 15dB & the median point between 10 to13dB. In end-stage, even the best points were down between 5 to 8dB & 85% of the points were down >22dB. Calculating the position of 15th, median & 85th percentile glaucoma disease severity can be classified & presented graphically by box plot.
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