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. Author manuscript; available in PMC: 2008 Jan 2.
Published in final edited form as: J Soc Inf Disp. 2007 Dec;15(12):1037–1045. doi: 10.1889/1.2825088

Figure 10.

Figure 10

Vision measurements without a device, with the improved NV-3 prototype of the night vision HMD field expander, and with the commercially-available comparison device (M-V). a) The extent of the visual field (VF) of one RP patient under full room illumination, and at 2 lux with and without the NV-3. b) Mean horizontal VF extents for 4 patients with tunnel vision and night blindness. The NV-3 substantially increased the VF extent at low light levels (2 lux), whereas the M-V device only restored the VF to baseline (normal room lighting, without device) levels. c) Mean contrast sensitivity scores for letter targets. The NV-3 had no effect on contrast sensitivity at low light levels (2 lux) whereas the comparison M-V device restored sensitivity to baseline levels. Error bars are standard deviations.