Accuracy of Traditional and Modern Formulas for Intraocular Lens Power Calculation After Radial Keratotomy Using Standard Keratometry.
Barrett True-K
DK Holladay 1
DK SRK/T
IOL calculation
PEARL-DGS
radial keratotomy
Journal
Clinical ophthalmology (Auckland, N.Z.)
ISSN: 1177-5467
Titre abrégé: Clin Ophthalmol
Pays: New Zealand
ID NLM: 101321512
Informations de publication
Date de publication:
2023
2023
Historique:
received:
21
06
2023
accepted:
25
08
2023
medline:
6
9
2023
pubmed:
6
9
2023
entrez:
6
9
2023
Statut:
epublish
Résumé
To compare the accuracy of multiple traditional and modern intraocular lens (IOL) power calculation formulas in post-radial keratotomy (RK) patients undergoing cataract surgery. This retrospective case series included 50 eyes with prior RK who underwent routine phacoemulsification surgery with single-piece acrylic IOL implantation (A constant = 118.8). Outcomes of multiple formulas were calculated. Included formulas were SRK/T, Holladay 1, Holladay 2, Haigis, Barrett True-K, Haigis and Barrett True-K (target refraction of 0.50 D), Barrett Universal II, Kane, PEARL-DGS, Shammas no history, DK SRK/T, DK SRK/T (target refraction of 0.50 D), Double K (DK) Holladay 1, and DK Holladay 1 (target refraction of 0.50 D). Averages of multiple combinations of best-performing single formulas were calculated. Primary outcome is mean absolute error (MAE). Haigis (with -0.50 D target refraction) and DK SRK/T showed the lowest mean and median absolute errors (MedAE) followed by Haigis, Barrett True-K, and Barrett True-K (with -0.50 D target refraction). Combinations of 3, 4, or 5 of best performing single formulas yielded good results with >60% of cases within +0.50 D of intended refraction and MAE around 0.50 D. The best performing formulas with flatter K readings were PEARL-DGS and Haigis (with additional -0.50 D target refraction) with MAE of 0.72 + 0.71 D and 0.70 + 0.70 D, respectively, followed by Barrett True-K (with intended -0.50 D target refraction) with MAE of 0.75 + 0.63 D. Using an average of three or more Haigis (with -0.50 D target refraction), the Barrett True-K, DK Holladay 1, and DK SRK/T formulas showed better outcomes than using a single formula for IOLMaster 700 standard K readings. The PEARL-DGS formula showed better accuracy in eyes with flatter K readings (<38 D).
Identifiants
pubmed: 37671334
doi: 10.2147/OPTH.S417336
pii: 417336
pmc: PMC10476658
doi:
Types de publication
Journal Article
Langues
eng
Pagination
2589-2597Informations de copyright
© 2023 Helaly et al.
Déclaration de conflit d'intérêts
The authors report no conflicts of interest in this work.
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