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Retinitis Pigemntosa (RP) is a hereditary ocular disease in which patches of pigment appear on the retina, potentially resulting in substantial...

What is the estimated % decline in visual field per year?
Retinitis Pigemntosa (RP) is a hereditary ocular disease in which patches of pigment appear on the retina, potentially resulting in substantial vision loss and in some cases complete blindness. An important issue is how fast the subjects decline. Visual field is an important measure of area of vision which is measured in degree 2 . A visual field area for a normal person is around 11,000 degree 2 . The longitudinal data in table 11.31 were provided by an individual patient. Suppose the rate of change of In ( Visual Field) is a linear function of follow- up time. 11.31 Longitudinal Visual Field data for one RP patient Visit Time (yr) Visual field area (degree 2) In (visual field area) 1 0 3059 8.03 2 1 3053 8.02 3 2 1418 7.26 4 3 1692 7.43 5 4 1978 7.59 6 5 1567 7.36 7 6 1919 7.56 8 7 1998 7.60 9 11 1648 7.41 10 13 1721 7.45 11 15 1264 7.14 Mean 6.09 1938 7.532 sd 4.97 597 0.280 What is the estimated % decline in visual field per year?
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Retinitis Pigemntosa (RP) is a hereditary ocular disease in which patches of pigment appear on the retina, potentially resulting in substantial vision loss and in some cases complete blindness. An...

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