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STEPHEN M. DRANCE; The Early Field Defects in Glaucoma. Invest. Ophthalmol. Vis. Sci. 1969;8(1):84-91.
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The origins of the depression of central isopter known as "baring of the blind spot" as an early sign of glaucoma were traced. Changes in isopter occurring with aging were reported. Baring of the blind spot could be produced in everybody with threshold targets and was therefore not a pathognomonic sign of the disease. A more rapid depression of the isopter with ocular hypertension has not yet been demonstrated but remains a possibility. The earliest changes in eyes with open angle glaucoma that could be discovered with the use of static perimetry were paracentral scotomas in the Bjerrum area separated from the blind spot, coalescing into an arcuate scotoma joining the blind spot.
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