Astigmatism Alters with Cycloplegia
A study by Asharlous et al., published in the Journal of Current Ophthalmology, showed a significant difference between prescription pre- and post- cycloplegia. The prescriptions were taken from 375 eyes before and after a drop of 1% cyclopentolate was added and a period of 30 minutes waited to allow for the cycloplegia to take effect.
The cycloplegia seems to only significantly affect "with-the-rule" and "against-the-rule", with little effect on the oblique astigmatisms. It also mainly affects hyperopic patients. How much clinical use this information will provide is yet to be seen, with further study into this effect required.
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