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Medical Forum / General / Vision / November 2007Blind spot question
Does the visual blind spot (optic disc) dimension change with glaucoma? Don W. > Does the visual blind spot (optic disc) dimension change with glaucoma? > > Don W. Yes, as damage occurs to the optic nerve the blindspot may enlarge. This does not necessarily occur in all cases of glaucoma. The other thing that frequently occurs is the development of new blindspots that may gradually enlarge as the glaucoma progresses. This is why visual field testing is performed and is one means of monitoring for stability or progression of glaucoma. > > Does the visual blind spot (optic disc) dimension change with glaucoma? > [quoted text clipped - 6 lines] > field testing is performed and is one means of monitoring for > stability or progression of glaucoma. Do you happen to know where in the literature this type of enlargement is documented? Don W. > Does the visual blind spot (optic disc) dimension change with glaucoma? Academically, yes, but not early and not usually uniform or predictably. The blind spot tends to elongate vertically to merge with the classic "arcuate" scotomas that develop in glaucoma. Measuring the blind spot requires some pretty tedious testing and a very cooperative observer, so it isn't very helpful for early detection. Uniform enlargement is more often attributed to neurological problems like optic neuritis and anterior ischemic neuropathy. -MT > Measuring the blind spot requires some pretty tedious testing and a very > cooperative observer, so it isn't very helpful for early detection. A standard field test is not good enough? Don W. >> Measuring the blind spot requires some pretty tedious testing and a very >> cooperative observer, so it isn't very helpful for early detection. > > A standard field test is not good enough? At a minimum I'd want the testing repeated before putting much importance on an apparent increase. -MT |
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