Target Visibility as a Function of Light Transmission Through Fixed Filter Visors

摘要

This study was conducted to determine the effect of amount of light transmission through fixed filter visors on the visibility of targets. The maintenance of proper visual acuity is of utmost importance to a naval aviator. For safety of flight reasons, he must be able to detect the presence of other aircraft at the greatest possible distance. Any goggles or visors provided for the protection of his vision must not seriously degrade visual acuity. Part I of this study measured visual acu ity under field conditions. It was conducted using the taxiway of the local airport at West Point, Virginia. In Part II of this study, standard measures of visual acuity were obtained, using a Snellen chart, under four levels of illumination. As in the first part, the three visors were used and were again compared with normal vision. For this part of the evaluation, four subjects were used, each of whom had 20/20 vision with one being corrected to this level by glasses. Results of Part II also are presented in the appendix. (Author)