Accuracy of Night Shooting in Abnormal Contrast Sensitivity Infantry Force

Nathaphon Apimeteetamrong MD1, Manapon Lekskul MD1, Raveewan Choontanom MD1

Affiliation : 1 Department of Ophthalmology, Phramongkutklao Hospital, Bangkok, Thailand

Objective : To compare the nighttime shooting performance with a group of normal and abnormal contrast sensitivity property. Design: Descriptive cross-sectional study.
Materials and Methods : Seventy-three participants from Infantry Regiment were recruited and underwent through eye examination tests, including visual acuity, color vision, contrast sensitivity test, and slit-lamp examination. Personal data and shooting experience were recorded. Shooting test with M16A1 Ri(cid:976)le in daytime and nighttime were performed.
Results : All participants were male with a mean age of 24.14±7.04 years old. Best-corrected visual acuity [BCVA] was 0.04±0.09 LogMAR. Mean Log contrast sensitivity was 2.24±0.07. Two participants had abnormal contrast sensitivity (1.8 Log). Five participants had abnormal color vision. The mean shooting score in daytime and nighttime were 6.88±2.32 and 5.30±3.00, respectively (p<0.001). No associated factors between nighttime shooting performance and contrast sensitivity property was found.
Conclusion : The accuracy of nighttime shooting was signi(cid:976)icantly less than daylight shooting. The present study showed no associated factor between contrast sensitivity and nighttime shooting performance. Further study with a larger sample size is needed for subgroup analysis.

Keywords : Contrast sensitivity, Night shooting, Daylight shooting

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