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.
Downloads
Published
How to Cite
Issue
Section
License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
The authors retain the copyright and grant the right to publish in the magazine for the first time with the transfer of the commercial right to Tishreen University Journal for Research and Scientific Studies - Health Sciences Series
Under a CC BY- NC-SA 04 license that allows others to share the work with of the work's authorship and initial publication in this journal. Authors can use a copy of their articles in their scientific activity, and on their scientific websites, provided that the place of publication is indicted in Tishreen University Journal for Research and Scientific Studies - Health Sciences Series . The Readers have the right to send, print and subscribe to the initial version of the article, and the title of Tishreen University Journal for Research and Scientific Studies - Health Sciences Series Publisher
journal uses a CC BY-NC-SA license which mean
You are free to:
- Share — copy and redistribute the material in any medium or format
- Adapt — remix, transform, and build upon the material
- The licensor cannot revoke these freedoms as long as you follow the license terms.
- Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- NonCommercial — You may not use the material for commercial purposes.
- ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
- No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.