Accommodation causes with-the-rule astigmatism in emmetropes

Purpose: To measure the changes in astigmatism when bilateral emmetropes ac commodate. Methods: Bilateral emmetropes accommodative responses were measu red with an improved photorefractometer PR-1100, which measured binocular r efraction in all meridians simultaneously as a fixation target was shown in natural space. Results: The accommodative responses in the vertical meridi an are greater than those in the horizontal meridian. In the horizontal mer idian, the accommodative responses are less than the accommodative stimulus . Conclusions: When accommodating the majority of bilateral emmetropes show with-the-rule astigmatism and lag of accommodation in the horizontal merid ian.