Accession Number:

ADA229237

Title:

Glare and Age: Acquisition of a Clinical Data Base for Aircrew Standards

Descriptive Note:

Final rept. Feb 1988-Jun 1990,

Corporate Author:

TEXAS UNIV HEALTH SCIENCE CENTER AT SAN ANTONIO

Report Date:

1990-10-01

Pagination or Media Count:

44.0

Abstract:

The trend towards a significant age-related decline in contrast sensitivity that we demonstrated in subjects aged 21 to 50 in previous studies prompted a replication with a large sample size and an investigation of scattered light, measured indirectly by disability glare, as a function of age. 1 We were unable to confirm the age-related decline of contrast sensitivity in the age range 21 to 50 with a large sample size, 30, in each decade. Contrast sensitivity to neither externally generated nor interference gratings changed significantly with age. 2 The high spatial frequency cutoff derived from the contrast sensitivity to 12, 16, and 20 cycle per degree gratings did not vary as a function of age. This is consistent with the fact that we selected only those subjects with 2020 or better visual acuity. 3 Consistent with the lack of declining contrast sensitivity over this age range was the lack of a significant age-related increase in susceptibility to disability glare as measured by sensitivity to 4 and 12 cycles per degree gratings without and with glare. The interaction between age and glare condition was not statistically significant. 4 Increment threshold for a low mesopic background did not change significantly as a function of age. 5 There was a significant increase in the increment threshold limited to the glare condition for the oldest decade in the paradigm simulating night-time glare. SDW

Subject Categories:

  • Anatomy and Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE