Aircrew visual acuity viewing with different night vision goggle eyepiece diopter settings

Share-Dawn P. Angel; J. Bruce Baldwin

doi:10.1117/12.542326

8 September 2004 Aircrew visual acuity viewing with different night vision goggle eyepiece diopter settings

Proceedings Volume 5442, Helmet- and Head-Mounted Displays IX: Technologies and Applications; (2004) https://doi.org/10.1117/12.542326
Event: Defense and Security, 2004, Orlando, Florida, United States

Abstract

The AN/AVS-9 night vision goggle (NVG) has an eyepiece lens that can be adjusted from +2 to -6 diopters (D). We have shown previously^1,2,3 that on average NVG users tend to select about -1D, with a range of +0.5D to -4D3. This study was designed to evaluate NVG visual acuity (NVG VA) and subjective ratings for a range of diopter settings including user-selected and three fixed settings of -0.25D, -1D and -2D. Twenty-one experienced USAF Special Operations aircrew members, including 15 pilots, served as subjects. The median user-selected setting was -1.25D and ranged from +0.5D to -3.5D. Only 2 of the 21 subjects had user-selected NVG VA significantly better than a fixed setting of -1D. Of those two, one was not wearing prescribed glasses and the other was 49 years old, presbyopic, and could not focus through the -1D lenses. Subjective ratings and NVG VA indicated that most people could fly with a fixed setting of -1D for each eye, although two individuals needed different diopter settings for the right and left eyes. The new Panoramic NVG (PNVG) has a fixed eyepiece focus of -1D. Results suggest the PNVG should have a limited set of accessory lenses available.

Citation Download Citation

Share-Dawn P. Angel and J. Bruce Baldwin "Aircrew visual acuity viewing with different night vision goggle eyepiece diopter settings", Proc. SPIE 5442, Helmet- and Head-Mounted Displays IX: Technologies and Applications, (8 September 2004); https://doi.org/10.1117/12.542326

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