This clinical calculation suite implements eight locally computable spherical IOL power calculation formulas based on published peer-reviewed literature, alongside interactive deep-link bridges for proprietary closed-source models.
Validation Standards
- T2 Formula: Verified against the official T2 API (4 cases, 20 power steps, max delta 0.0001 D; endpoint iolcalculator.com/api/v1/t2/preop).
- SRK/T, Hoffer Q, Haigis: Cross-checked against an independent open-source implementation (goldengrape/Python-for-ophthalmologist), 4 cases, max delta 0.0000 D.
- Holladay 1, Castrop, Olsen C, Cooke CMAL + SRK/T, Wang-Koch AL: No external oracle reached — validated by published equations + mathematical self-consistency and invariants only.
Formula Citations
- SRK/T: Retzlaff JA et al. J Cataract Refract Surg 1990;16(3):333-340
- T2: Sheard RM, Smith GT, Cooke DL. J Cataract Refract Surg 2010;36(11):1829-1834
- Holladay 1: Holladay JT et al. J Cataract Refract Surg 1988;14(1):17-24
- Hoffer Q: Hoffer KJ. J Cataract Refract Surg 1993;19(6):700-712
- Haigis: Haigis W et al. Graefes Arch Clin Exp Ophthalmol 2000;238(9):765-773
- Castrop: Langenbucher A et al. PLoS ONE 2021;16(6):e0252102
- Olsen C: Olsen T, Hoffmann P. J Cataract Refract Surg 2014;40(5):764-773
- Cooke CMAL: Cooke DL, Cooke TL. J Cataract Refract Surg 2019;45(3):351-354
- Wang-Koch AL: Wang L et al. J Cataract Refract Surg 2011;37(11):2018-2027
Closed Formulas Bridge
Third-generation AI and proprietary ray-tracing formulas are closed-source. Where the publisher exposes a usable machine-readable calculator, this app queries it and shows the number that calculator returns — Barrett Universal II (calc.apacrs.org), Cooke K6 (cookeformula.com official API), EVO 2.0 (evoiolcalculator.com), and PEARL-DGS (iolsolver.com GraphQL) are live rows: the biometry is sent to that site and the result displayed is theirs, never a local approximation. Hoffer QST is actively relayed to hofferqst.com and reports upstream availability directly. Where no automatable source exists (Kane Formula, Hill-RBF 3.0, Karmona, and Barrett True-K Toric) the row provides honest deep links and in-app embeds with no number shown. Every locally computed formula here uses the authors' own published equations and code.