Effect of pharmaceutical pupil dilation on intraocular lens power calculations in cataract patients using ultrasonography

Authors

  • Mahmoud Rajab Tishreen University
  • Majd Abo Nqra Tishreen University

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.

 

Author Biographies

Mahmoud Rajab, Tishreen University

Professor, Department of Ophthalmology, Faculty of Medicine

Majd Abo Nqra, Tishreen University

Postgraduate Student , Ophthalmology Department, Faculty of Medicine

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Published

2021-09-16

How to Cite

1.
رجب م, أبونقرة م. Effect of pharmaceutical pupil dilation on intraocular lens power calculations in cataract patients using ultrasonography. Tuj-hlth [Internet]. 2021Sep.16 [cited 2024Nov.24];43(4). Available from: https://journal.tishreen.edu.sy/index.php/hlthscnc/article/view/10890

Issue

Vol. 43 No. 4 (2021): Tishreen University Journal for Research and Scientific Studies - Health Sciences Series

Section

Articles

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