ArticleZeitschrift fur medizinische Physik2024
Considerations of a thick lens formula for intraocular lens power calculation.
Article in Zeitschrift fur medizinische Physik, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- Objective assessment of accommodation with an accommodative intraocular lens: Development of methodology and case report.Zeitschrift fur medizinische Physik · 2026Article
- Basic Optics Underlying Current Intraocular Lenses.Journal of clinical medicine · 2025Review
- Accuracy of Intraocular Lens Power Calculation Based on Distance from Haptic to Principal Object Plane.Journal of cataract and refractive surgery · 2025Article
- An optical method for deriving the anterior and posterior curvatures of intraocular lenses using dual back-vertex power measurements.PloS one · 2025Article
- Investigation of the myopic outcomes of the newer intraocular lens power calculation formulas in Korean patients with long eyes.Scientific reports · 2024Article
- Prediction of IOL decentration, tilt and axial position using anterior segment OCT data.Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie · 2024Article
- Comparison of ocular biometric parameters between two swept-source optical coherence tomography devices and Scheimpflug tomography in patients with cataract.International journal of ophthalmology · 2024Article
- Theoretical Impact of Intraocular Lens Design Variations on the Accuracy of IOL Power Calculations.Journal of clinical medicine · 2023Article
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7 authors.
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Abstract
backgroundIn recent years, some lens manufacturers have committed to providing lens shape data for some of their lens models. The purpose of this study is to present a strategy for prediction of intraocular lens power and residual refraction based on a pseudophakic model eye containing 5 refractive surfaces and to show its applicability using worked examples.
methodsA pseudophakic model eye with a thin spectacle correction, a thick cornea (radius of curvatures for both surfaces and central thickness) and a thick IOL (either radius of curvatures RLa and RLp for front and back surface or equivalent power PL and Coddington factor CL; and either central thickness LT or edge thickness and optic diameter) was set up. Calculations were performed based on linear Gaussian optics (vergence formulae). Formulae were provided to derive the lens power/shape and the residual equivalent spectacle refraction SEQ. From the lens shape the location of the haptic plane HP, the image sided principal plane of the lens HL, and the ocular magnification OM were extracted.
resultsThe calculation of a thick intraocular lens and the prediction of residual refraction is presented with reference to 3 working examples: A) lens varied in PL and shifted with its haptic plane keeping the CL constant, B) lens varied in CL and shifted with its haptic plane keeping PL constant, and C) CL and PL of the lens varied keeping its haptic plane position in the eye constant. For each combination of parameters (PL, CL, or haptic plane shift) the parameters influencing SEQ, OM and HL-HP were analysed.
conclusionSome modern optical biometers currently on the market provide the radii of curvature of both corneal surface and all relevant distances in the eye. With additional data on the lens shape, it would be possible to improve lens power calculations by switching from thin to thick lens models for the cornea and for the lens. This would overcome one of the major drawbacks of current lens power calculation methods.
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