Related Experiment Videos
Effect of target content at higher spatial frequencies on the accuracy of the accommodation response
1Department of Ophthalmic Optics, University of Manchester Institute of Science and Technology, U.K.
Abstract:
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.