Effect of target content at higher spatial frequencies on the accuracy of the accommodation response.
The accommodation responses to sinusoidal and square-wave gratings at the same vergence (-5.0 dioptres) are compared as a function of the modulation of the fundamental of both waveforms. At low spatial frequencies (less than or equal to 2 c deg-1), responses to square-wave gratings are found to be more accurate than those to sine-waves. At higher frequencies the responses become very similar. An explanation is offered in terms of the contribution of higher harmonics to the square-wave response.
Tucker
J
J
Department of Ophthalmic Optics, University of Manchester Institute of Science and Technology, U.K.
Charman
W N
WN
D000065:Accommodation, Ocular; D000328:Adult; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D010364:Pattern Recognition, Visual / Q000502:physiology*; D014792:Visual Acuity