21 March 1989 Vision Restriction Device (VRD)
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In geographical areas where low-level nighttime training with high-speed aircraft is restricted, it becomes imperative to employ a vision restriction device (VRD) that simulates nighttime conditions during daytime training. In response to this requirement, a new "bifocal" visor has been designed and evaluated. It consists of spectrally selective filters centered on the eyes, a neutral density lower portion, and is opaque elsewhere. The filters increase the contrast of the navigation forward-looking infrared (FLIR) image projected onto the heads up display (HUD). The neutral density portion allows the pilot to see all displays in full color by simply glancing down. The remainder of the visor is opaque so that the pilot cannot see the outside world and, as such, the visor simulates nighttime conditions. Initial pilot response has been favorable and flight tests are currently underway for evaluation purposes.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gerald C. Holst, Gerald C. Holst, } "Vision Restriction Device (VRD)", Proc. SPIE 1117, Display System Optics II, (21 March 1989); doi: 10.1117/12.960936; https://doi.org/10.1117/12.960936


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