Effect of Posterior Keratometry on the Accuracy of 10 Intraocular Lens Calculation Formulas: Standard Keratometry versus Total Keratometry.
Graefes Arch Clin Exp Ophthalmol
; 262(6): 1829-1838, 2024 Jun.
Article
in En
| MEDLINE
| ID: mdl-38197993
ABSTRACT
PURPOSE:
To investigate the effect of posterior keratometry (PK) on the accuracy of 10 intraocular lens (IOL) power calculation formulas using standard keratometry (K) and total keratometry (TK).METHODS:
This is a retrospective consecutive case-series study. The IOL power was calculated using K and TK measured by IOLMaster 700 in 6 new-generation formulas (Barrett Universal II, Emmetropia Verifying Optical (EVO) 2.0, RBF Calculator 3.0, Hoffer QST, Kane, and Ladas Super Formula) and 4 traditional formulas (Haigis, Hoffer Q, Holladay 1, and SRK/T). The arithmetic prediction error (PE) and mean absolute PE (MAE) were evaluated. The locally-weighted scatterplot smoothing was performed to assess the relationship between PE and PK.RESULTS:
A total of 576 patients (576 eyes) who underwent cataract surgery were included. Compared with using K, all formulas using TK showed a hyperopic shift in the whole group. Specifically, for eyes with PK exceeding -5.90 D, all formulas using TK exhibited a hyperopic shift (all P < 0.001), while eyes with PK less than -5.90 D showed a myopic shift (all P < 0.001). The MAE of new-generation formulas calculated with TK and K showed no statistical differences, while the MAE of traditional formulas with TK was larger (TK 0.34 ~ 0.43 D; K 0.33 ~ 0.42 D, all P < 0.05).CONCLUSIONS:
The prediction bias of formulas with TK increased as PK deviated from -5.90 D. TK did not improve the prediction accuracy of new-generation formulas, and even performed worse in traditional formulas.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Refraction, Ocular
/
Biometry
/
Cornea
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Optics and Photonics
/
Lenses, Intraocular
Limits:
Aged
/
Aged80
/
Female
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Humans
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Male
/
Middle aged
Language:
En
Journal:
Graefes Arch Clin Exp Ophthalmol
Year:
2024
Document type:
Article
Affiliation country:
China