Back to Search
Start Over
Optimizing lens constants specifically for short eyes: Is it essential?
- Source :
-
Indian Journal of Ophthalmology . Sep2021, Vol. 69 Issue 9, p2293-2297. 5p. - Publication Year :
- 2021
-
Abstract
- <bold>Purpose: </bold>Optimization of lens constants is a critically important step that improves refractive outcomes significantly. Whether lens constants optimized for the entire range of axial length would perform equally well in short eyes is still a matter of debate. The aim of this study was to analyze whether lens constants need to be optimized specifically for short eyes.<bold>Methods: </bold>: This retrospective observational study was conducted at a tertiary care hospital in Central India. Eighty-six eyes of eighty-six patients were included. Optical biometry with IOLMaster 500 was done in all cases and lens constants were optimized using built-in software. Barrett Universal II, Haigis, Hill-RBF, Hoffer Q, Holladay 1, and SRK/T formulae were compared using optimized constants. Mean absolute error, median absolute error (MedAE), and percentage of eyes within ±0.25, ±0.50, ±1.00, and ±2.00 diopter of the predicted refraction, of each formula were analyzed using manufacturer's, ULIB, and optimized lens constants. MedAE was compared across various constants used by Wilcoxon signed-rank test and among optimized constants by Friedman's test. Cochran's Q test compared the percentage of eyes within ± 0.25, ±0.50, ±1.00, and ± 2.00 diopter of the predicted refraction. A value of P < 0.05 was considered statistically significant.<bold>Results: </bold>: Optimized constant of Haigis had significantly lower MedAE (P < 0.00001) as compared to manufacturers. However, there was no statistically significant difference between ULIB and optimized constants. Postoptimization, there was no statistically significant difference among all formulae.<bold>Conclusion: </bold>: Optimizing lens constants specifically for short eyes gives no added advantage over those optimized for the entire range of axial length. [ABSTRACT FROM AUTHOR]
- Subjects :
- *INTRAOCULAR lenses
*BIOMETRY
*VISUAL accommodation
*OPTICS
Subjects
Details
- Language :
- English
- ISSN :
- 03014738
- Volume :
- 69
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Indian Journal of Ophthalmology
- Publication Type :
- Academic Journal
- Accession number :
- 152159892
- Full Text :
- https://doi.org/10.4103/ijo.IJO_63_21