The Human Eye and Night Vision Goggles

Introduction One of the most common causes of fatal helicopter accidents is Controlled safety valve Into Terrain (CFIT) at night. (F depressWeb). The major contributor to such accidents is the pilot's take aim of situational aw arness, or rather ? not being able to think where they are going, or what might be in the means of unobstructed flight. As helicopters are routinely used in low-altitude missions ? they are frequently required to fly in compressed proximity to trees, power lines, telephone poles, etc. As such, it is vitally important for the pilot to be able to see and void these hazards to navigation. During daylight hours, these hazards pose a minimal risk to flight. However, as the sun sets and the amount of visible light wanes, these same hazards concur life threatening. The reliance on night vision engineering has become invaluable in assisting aviators in flying at night. By magnifying the ambient light, shadow Vision Goggles (NVG's) and devices trim down the problems associated with unaided vision in the dark. The Human Eye and Night Vision Goggles Vision is a physical sense that uses light to provide information to the brain in order to make conclusions about the surroundings. The human tenderness is an intricate organ that whole kit best when there is an adequate supply of light. Our eyes give birth been often compared to cameras in that a camera filters light done the lens, controls the intensity with an aperture and focuses the image onto a film.



Light coming into an eye is filtered through the cornea, the iris regulates how much light comes through, and then it is center by the lens onto the retina. During the day, we are able to detect color, deepness perception, distance and visual acuity. At night, all of those senses are greatly diminished. Visual clarity can be reduced to 20/200 or greater at night. The sensitivity of the retina (where images are focused) is greatly hindered when the light levels drop. On a clear night (with a broad moon and no clouds), the...

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