Time-of-day variations in oculomotor function: II. Steady-state accommodation to square-wave gratings

Ophthalmic Physiol Opt. 1988;8(4):423-6. doi: 10.1111/j.1475-1313.1988.tb01179.x.

Abstract

Time-of-day variations in both tonic accommodation and steady-state accommodation to a grating were assessed for 16 observers who were tested once in the morning and again 12 hours later. The mean night-time tonic accommodation was +0.5 D greater than the morning value. Square-wave gratings of 4.2 and 8.4 c/deg were presented to the observers at distances of 0, 1.07, 2.13, 3.2 D. Over-accommodation to far targets and under-accommodation to near targets occurred for both gratings. All values of steady-state accommodation were somewhat greater in the evening. Large individual differences were noted.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Accommodation, Ocular*
  • Adult
  • Female
  • Humans
  • Male
  • Oculomotor Muscles / physiology*
  • Pattern Recognition, Visual / physiology
  • Time Factors