Syed S Hasnain.
The Orderly Loss of Visual Field in Glaucoma.
Ophthalmol Update Jan ;14(3):50-3.

Chronic Glaucoma is a misunderstood disease since given a separate entity in the 1850s. There are many conflicting views of glaucoma but on one issue we have complete agreement: the million or so nerve fibers (NFs) in the optic nerve head (ONH) are always being destroyed in an orderly sequence starting with the most peripheral NFs and ending with the most central. If NFs had been destroyed randomly, then the role of perimetry in glaucoma would be redundant as the visual field (VF) would be erratic and meaningless. The perimetry for glaucoma is mainly performed in finding isolated scotomas in the paracentral area (10 to 20 degrees from the fixation point) which occur in the early stages of glaucoma. These isolated scotomas coalesce to form superior and inferior arcuate scotoma starting from the blind spot and ending nasally on the horizontal raphe.

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