October 2003
Volume 3, Issue 9
Free
Vision Sciences Society Annual Meeting Abstract  |   October 2003
Comparing contrast sensitivities to angular frequency stimuli and sinewave gratings in aged
Author Affiliations
  • Natanael A Santos
    Universidade Federal da Paraíba, PB, Brazil
  • Maria Lúcia B Simas
    Universadade Federal de Pernambuco, PE, Brazil
  • Renata Maria B. L. Nogueira
    Universadade Federal de Pernambuco, PE, Brazil
Journal of Vision October 2003, Vol.3, 655. doi:10.1167/3.9.655
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      Natanael A Santos, Maria Lúcia B Simas, Renata Maria B. L. Nogueira; Comparing contrast sensitivities to angular frequency stimuli and sinewave gratings in aged. Journal of Vision 2003;3(9):655. doi: 10.1167/3.9.655.

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Abstract

We measured 12 contrast sensitivity functions for sinewave gratings (CSF) as well as 12 contrast sensitivity functions for angular frequency stimuli (aCSF) using a forced-choice paradigm.. Six volunteers (60–65 years-old) with normal vision assessed by ophthalmologist on the last 12 months participated on the experiments. We used spatial frequencies of 0.5, 1, 2, 3, 4, 6 and 9 cpg and angular frequencies of 2, 4, 8, 16, 24, 32, 48, 64 and 96 cycles/360o to measure each contrast sensitivity function. Stimuli were computer generated on a 21 inch monitor SONY-BVM-1910. All measures were made at a distance of 150 cm, binocularly, with mean luminance of 6.9 cd/m2. The stimuli were circular with a diameter of 7.25 degrees of visual angle. Maximum sensitivity occurred at 3–4 cpg for CSF and at 16–32 cycles/360° for aCSF. Sensitivity to angular frequencies (aFSC) was about 1.5 times higher than that for gratings (CSF). This effect was statistically significant at p<0.001. Results show that contrast sensitivities for angular frequencies are higher than for sinewave gratings

Santos, N. A., Simas, M. L. B., Nogueira, R. M. B. L.(2003). Comparing contrast sensitivities to angular frequency stimuli and sinewave gratings in aged [Abstract]. Journal of Vision, 3( 9): 655, , 655a, doi:10.1167/3.9.655. [CrossRef]
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