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Updated: May 23, 2026

Scanning Light Scattering Profiler (SLPS) Based Methodology to Quantitatively Evaluate Forward and Backward Light Scattering from Intraocular Lenses

Scanning Light Scattering Profiler (SLPS) Based Methodology to Quantitatively Evaluate Forward and Backward Light Scattering from Intraocular Lenses

Published on: June 6, 2017

Orbscan II and double-K method for IOL calculation after refractive surgery.

Sérgio Kwitko¹, Diane R Marinho, Samuel Rymer

¹Department of Ophthalmology, Hospital de Clínicas de Porto Alegre, Federal University of Rio Grande do Sul, Av. Dr. Nilo Peçanha 724/401, São Paulo, Brazil. sergio@oftalmocentro.com.br

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie

|March 30, 2012

Summary

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Calculating intraocular lens (IOL) power after refractive surgery is challenging. Using Orbscan II topography data in the double-K method improves IOL calculation accuracy, particularly for patients with prior myopic refractive surgery.

Area of Science:

Ophthalmology
Refractive Surgery
Cataract Surgery

Background:

Accurate intraocular lens (IOL) calculation is crucial for successful cataract surgery.
Post-refractive surgery eyes present unique challenges for IOL power calculation.
Existing methods may not provide sufficient precision in these complex cases.

Purpose of the Study:

To evaluate the efficacy of incorporating Orbscan II topography data into the double-K method for IOL calculation.
To compare the accuracy of IOL power calculations using different post-keratometry (post-K) values.
To determine if enhanced IOL calculation improves refractive outcomes in patients with prior refractive surgery.

Main Methods:

Prospective study of 43 eyes undergoing cataract extraction after refractive surgery.

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Last Updated: May 23, 2026

Scanning Light Scattering Profiler (SLPS) Based Methodology to Quantitatively Evaluate Forward and Backward Light Scattering from Intraocular Lenses

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Published on: June 6, 2017

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Published on: September 16, 2025

IOL calculation using the double-K method with post-K values from Orbscan II topography.

Comparison of predicted refraction with actual 30-day postoperative refraction.

Assessment of anterior chamber depth measurements between IOL Master and Orbscan II.

Main Results:

Using Orbscan II topography for post-K values in the double-K method led to more accurate IOL calculations.
Standard keratometry or topography-derived post-K values resulted in significant refractive errors in post-myopic LASIK eyes.
Pre-K values derived from Orbscan II topography showed similar refractive outcomes across all groups.
Anterior chamber depth measurements were comparable between IOL Master and Orbscan II.

Conclusions:

Orbscan II topography data integrated into the double-K method enhances IOL calculation precision.
This improved accuracy is particularly beneficial for patients previously undergoing myopic refractive surgery.
The study validates a more reliable approach for IOL power calculation in complex eyes.