Accession Number:

ADA300597

Title:

Time-Limited Visual Resolution in Pilot Trainees.

Descriptive Note:

Final rept.,

Corporate Author:

ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL

Personal Author(s):

Report Date:

1995-09-01

Pagination or Media Count:

8.0

Abstract:

Superior vision is needed for piloting Aircraft in military and civilian environments. Although visual evaluations of potential pilots typically are conducted with no limit on viewing time, aviation and related occupations require superior vision under time-limited viewing conditions, and assessment of this capability is needed. The purpose of this study was to evaluate time-limited visual resolution in pilot trainees. A forced-choice letter recognition task was used to measure visual acuity VA and small letter contrast sensitivity SLCS in 37 trainees who had satisfied all vision requirements for pilot training. VA and SLCS were highly correlated r 0.76, indicating that the two tests measure similar aspects of visual resolution. However, although VA scores were distributed across 0.16 log units two lines of letters on a VA chart, SLCS scores varied across 0.35 log units, which is nearly four lines on the SLCS chart. The variation in SLCS performance could be explained, in part, by subtle refractive error in pilot trainees. The results exemplify differences in performance among visually qualified trainees, and underscore the need for proper refractive correction. SLCS is a useful screening test for identifying subtle changes in vision that herald the need for optical or medical intervention.

Subject Categories:

  • Anatomy and Physiology
  • Personnel Management and Labor Relations

Distribution Statement:

APPROVED FOR PUBLIC RELEASE