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The Effect of Short Acting Mydriatics on Intraocular Lens power Measurement Using IOLMaster® Biometry


 
 
 In this study, we aimed to investigate the dynamics affecting IOL power calculations and the effect of pupillary dilation on these dynamics.
 
 
 
 Thirty eyes of cataract patients who visited Embaba ophthalmic hospital outpatient clinic were included in this study. Patients with past history of ocular trauma, ocular surgeries, corneal opacities, Ocular pathology like glaucoma, uveitis, retinal disease or any systemic disease were excluded from this study. Our candidates were subjected to full ophthalmological examination including VA, slit lamb biomicroscopy, BCVA, applanation tonometry, fundus examination and IOL power measurement using IOL Master 700 before and after pupillary dilatation using 1 % tropicamide eye drops.
 
 
 
 Our study revealed that dilatation does not affect the Holladay 2 calculated IOL power and we found that AL and keratometric biometry (K1, K2) were not affected by dilatation (p-value was 0.584, 0.804, 0.436, respectively); however, the ACD was significantly increased post-dilatation (with mean difference 0.056; P-value < 0.05), that may be because the lens and iris plane move backward on dilatation.
 
 
 
 This study revealed that biometric measurements as axial length (AL), K1 and K2 were not affected by pupillary dilatation. While ACD was significantly affected with p value 0=024. Although anterior chamber depth (ACD) was affected it did not affect IOL power. Which means that IOL power measured with dilatation is reliable and it can be used to decide IOL used in cataract surgery.
