Interpupillary and Vertex Distance Effects on Field-of-View and Acuity With ANVIS
ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
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Third generation Aviation Night Vision Imaging Systems ANVIS employ vertical, tilt, interpupillary distance, vertex distance, and focus adjustments. ANVIS field-of-view is nominally 40 degrees but can be limited by adjustments. Interpupillary distance effects on ANVIS field-of-view have been computed, but seldom measured. There have been reports of acuity loss at the periphery of ANVIS fields-of-view. Fields-of-view were measured in 10 subjects, acuities in 8. ANVIS were used with a 10-foot working distance. Acuities were Assessed using Bailey-Lovie charts. At the 18 mm vertex distance, binocular and monocular fields-of-view decreased with decentration. At the 32 mm vertex distance, binocular and monocular fields-of-view were reduced at optimal interpupillary distance, and decreased with increasing decentration. The total horizontal field-of-view at 32 mm vertex distance was increased by increasing decentration, offsetting the reduction caused by increased vertex distance. Acuity was relatively insensitive to changes in vertex distance and interpupillary distance, but was substantially reduced in the periphery of the field-of-view, and under low contrast.
- Infrared Detection and Detectors