Laser Protection with Image Intensifier Night Vision Devices

摘要

Current military ranging and targeting technology employs high power laser systems. Since coherent (laser) energy with wavelengths in the visible and near infrared can seriously damage the retina of the eye, laser retinal injury has been the subject of many studies. The results of these investigations are used by various agencies to recommend laser eye protection. In the aviation community, since laser protective helmet visors are not compatible with most common night vision devices (NVDs), i.e., AN/PVS-5 Night Vision Goggle (NVG) and Aviator's Night Vision Imaging System (ANVIS), the only laser protection currently afforded the NVD aviator is a barrier-type protection provided by the device. Based on eye anatomy and function, three retinal regions have been identified as critical to protect - fovea, macula and peripapillary zone (1 to 2 degree annulus surrounding the optic disc). When full-coverage laser protection is not possible, minimum acceptable coverage must include these regions. A circular area which includes the critical regions would cover the central retina, i.e., area out to 25 degrees from the visual axis. (kr)