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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: Arch Ophthalmol. 2011 May;129(5):611–617. doi: 10.1001/archophthalmol.2011.85

Figure 2.

Figure 2

(a) The ring scotoma when viewing through a 3x Ocutech Mini bioptic telescope. The plotted field of view through the telescope has a diameter of 12 degrees, and the ring scotoma (gray area) has a diameter of 44 degrees with a 75% contrast stimulus (somewhat larger than the computed 36 degrees). (b) A simulated view of a road sign as viewed through a 3x bioptic telescope. The magnified view blocks the view of the intersection. (c) The binocular visual field measured when viewing binocularly through the same telescope. The ring scotoma is no longer apparent as the fellow eye is able to detect the perimetry targets in the ring scotoma area. Only field corresponding to the physiological blind spot of the fellow eye is recorded as not seen, because it overlaps within the ring scotoma.