Study of performance characteristics of ANVIS MK-III night-vision goggle and comparison with other NVGs for aviation usage

Abstract

Objectives: Night Vision Goggles (NVGs) are widely used in military aviation. Performance of an NVG in terms of high resolution and target acquisition is considered a critical requirement. Gen III NVGs have been considered superior to Gen II and Gen II++ NVGs. The purpose of the study was to evaluate the performance characteristics of ANVIS MK-III NVG and compare them to those of other available NVGs. Material and Methods: ANVIS MK-III Gen III NVG was studied for its performance in terms of visual acuity (VA), contrast sensitivity, and field of view (FOV). Six subjects familiar with use of NVG participated in the study. VA was measured using USAF 1951 Tri-bar chart, while contrast sensitivity was measured using PelliRobson chart under full-moon (FM), half-moon (HF), quarter-moon (QM), and starlight (SL) conditions. The FOV was measured using Cross Bar chart. Comparisons were made with the data of other NVGs available with the Institute. Results: The mean VA of ANVIS MK-III NVG was found to be 20/29, 20/31, 20/34, and 20/39 under of FM, HF, QM, and SL illumination conditions, respectively. The mean contrast sensitivity was 0.9, 0.75, 0.6, and 0.53 log CS units, respectively, with mean FOV of 39.5°. The results were compared with performance characteristics of NL 93, GEO1, and F4949 NVGs. Conclusion: The ANVIS MK-III NVG was found to have higher VA function as compared to other NVGs and better contrast sensitivity function as compared to NL-93 and GEO1 NVG. All the NVGs had comparable FOV. The ANVIS Mk-III NVG in the current configuration with Helmet Display and Tracking System was found to be heavier and needs further ergonomic evaluation.