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Retinal image quality in the human eye as a function of the accommodation


The changes in the retinal image quality with accommodation in the human eye were studied by using a near-infrared double-pass apparatus. A slightly better modulation transfer function (MTF) in the unaccommodated eye with respect to the accommodated eye was found when using an artificial pupil with a fixed diameter. The technique allows to estimate the MTF of the accommodated eye discounting the effect of the  accommodative defocus error. Most of the reduction found in the MTF with  accommodation could be explained in terms of the accommodative defocusing error. However, the shape of the retinal images clearly changes with accommodation indicating that other aberrations are also altered with accommodation. In general, the double-pass image for the accommodated eye tends to be more symmetric than the corresponding to the unaccommodated eye. This is probably due either to a decrease in the amount of coma-like aberrations with accommodation or to an increase of other symmetric aberrations, such as defocus or spherical aberration, that hide the asymmetries present in the retinal image of the  unaccommodated eye.

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