Effects of pharmacological mydriasis in anterior chamber depth measurements with IOL Master and Sirius

Resumo

This study aims to analyze the influence of pharmacological pupillary dilation in the anterior chamber depth (ACD) and anterior chamber angle (ACA) measured with IOL Master and Sirius. A total of 99 eyes of 50 patients were included in the sample with an age range of 15-78. 24 of them were induced with cyclopentolate 1% and 75 with tropicamide 1% and phenylephrine 10%. ACD was measured with IOL Master and ACD, ACA and pachymetry with Sirius. All the analyzed variables were statistically significant (P<0.05) except pachymetry. IOL Master measurements of ACD increased 0.068 ± 0.007 mm on average after pupillary dilatation. However, a narrowing of the anterior chamber (AC) of 0.078 ± 0.031 mm on average was found. A good correlation between Sirius and IOL Master pre dilation measures was found. The AC increased 10.92 ± 0.87 degrees on average after dilation of the pupil. There are significant differences in the ACD measured with IOL Master and Sirius before and after topical application of mydriatics and cycloplegics drugs in the eye, those differences are statistically but not clinically significant. The ACA also varied significantly. More studies are necessary in order to check the repeatability and reliability of Scheimpflug technology devices on dilated eyes.