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.
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