Effect of pharmaceutical pupil dilation on intraocular lens power calculations in cataract patients using ultrasonography
Abstract
Purpose:
to evaluate the effect of pupil dilation on ocular biometrics and intraocular lens (IOL) power calculation using contact ultrasonography.
Materials and Methods:
In this cross sectional study , contact ultrasonic biometrics measurements using (AVISO Quantel) were performed on 72 eyes of patients with cataract scheduled for cataract surgery at the ophthalmology department of Tishreen University Hospital/Lattakia from May 2020 to May 2021.
The axial length (AL), mean keratometry (Km), anterior chamber depth (ACD) and intraocular lens (IOL) power usig SRK/T and Haigis formulas were measured before and after instillation of 1% tropicamide eye drop. Each parameter was compared by a Paired T Student prior to and after pupillary dilation and the results were analysed.
Results:
ACD increased by 3.2% after pupil dilation and the difference was statistically significant (p=0.001). The difference was not significant in AL (p=0.1) and Km (p=0.5) measurements.
Pupil dilation did not affect IOL power calculation based on SRK/T formula targeting emmetropia (p=0.08).However, using the Haigis formula significantly changed calculations for emmetropia (p=0.003).
Conclusion: Pupil pharmaceutical dilation using 1% tropicamide significantly effect the ultrasonic measurements of ACD and IOL power calculation using Haigis formula.
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