617 0

The effect of ocular biometric factors on the accuracy of various IOL power calculation formulas.

Title
The effect of ocular biometric factors on the accuracy of various IOL power calculation formulas.
Author
권지원
Keywords
Anterior chamber depth; IOL formula; Ocular biometry
Issue Date
2017-05
Publisher
BIOMED CENTRAL LTD
Citation
BMC OPHTHALMOLOGY, v. 17, Article no. 62
Abstract
Background: To evaluate how differences in ocular biometry affects the Hoffer Q, Holladay 1, SRK/T, and Haigis intraocular lens power calculation formulae predictions.Methods: This study was performed on 91 eyes of 91 patients who underwent uneventful cataract surgery. Ocular biometry values were measured using the IOL Master 500, and intraocular lens (IOL) power was calculated using the Haigis, Hoffer Q, Holladay 1, and SRK/T formulas. We calculated the expected difference (ED) of each 3rd generation formula from the Haigis formula by subtracting the predicted refraction of the Haigis formula from the predicted refraction of each 3rd generation formula. Post-operative anterior chamber depth (ACD) was measured at 1 month after surgery using the IOL master. We calculated errors of each formula by subtracting predicted from manifest refraction at post-operative 1 month. Correlation analysis was performed between ocular biometry values, formula expectation values, formula errors and absolute formula errors.Results: Multiple regression analysis revealed that preoperative ACD was the only significant factor for ED prediction in all of the 3rd generation formulas. For mean errors, axial length and post-operative 1-month change of ACD (delta ACD) correlated significantly with the errors in all 3rd generation formulas, but not with errors of the Haigis formula. Median absolute error (MedAE) of the formulas were 0.40 D for the Hoffer Q formula, 0.37 D for the Holladay formula, 0.34 D for the SRK/T formula, and 0.41 D for the Haigis formula. The MAE of the formulas were 0. 50 +/- 0.47 D for the Hoffer Q formula, 0.50 +/- 0.50 D for the Holladay formula, 0.47 +/- 0.51 D for the SRK/T formula, and 0.50 +/- 0.47 D for the Haigis formula.Conclusion: Regarding ED between the third generation and Haigis formulas, preoperative ACD demonstrated the greatest influence. Calculating mean absolute errors of the formulas, all IOL formulas showed excellent and comparable accuracy. Post-operative change (delta) of ACD correlated significantly with errors of third generation formulas according to simulated ACD.
URI
https://bmcophthalmol.biomedcentral.com/articles/10.1186/s12886-017-0454-yhttps://repository.hanyang.ac.kr/handle/20.500.11754/114115
ISSN
1471-2415
DOI
10.1186/s12886-017-0454-y
Appears in Collections:
COLLEGE OF MEDICINE[S](의과대학) > MEDICINE(의학과) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE