VISUAL RESOLUTION UNDERWATER
NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT
Pagination or Media Count:
Visual resolution in air and underwater were compared using Landolt Ring targets and a self-luminous, water- and pressure-proof target mount. SCUBA diving masks were worn during the tests, both in water and in air. Comparisons were also made while viewing above and below surface targets through a periscope from a surface position. In both instances, visual resolution in clear water was better than in air at the same actual target distance, when apparent luminances were equated for the two conditions. In most cases, the improvement while wearing the SCUBA mask fell below predictions based on the magnification of the target image underwater. The reasons for this were ascribed to fogging of the mask underwater, and the lack of sufficiently small targets for some observers. The difference in resolution between air and underwater viewing through the periscope was nearer to that predicted by theoretical computations.
- Personnel Management and Labor Relations
- Anatomy and Physiology
- Life Support Systems