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

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Abstract

Background

Precise IOL calculation in post-refractive surgery patients is still a challenge for the cataract surgeon. The purpose of this study is to test whether adding Orbscan II values into the double-K method improves IOL calculation in this group of patients.

Methods

A prospective study with 43 eyes previously submitted to refractive surgery that underwent cataract extraction. IOL calculation was performed with double-K method. Post-K value was derived from Orbscan total-mean power map. The average corneal curvature of the general population (43.8D) was used as the pre-K value. Refraction results 30 days after surgery were compared with refraction that would be obtained if we used: (1) post-K values from keratometry, (2) post-K values from topography, and (3) pre-K values from Orbscan total-mean power. Anterior chamber depth measures obtained with the IOL Master and Orbscan II were compared.

Results

Mean postoperative spherical equivalent (SE) was −0.25 ± 1.10 D in eyes submitted to radial keratotomy , –1.04 ± 1.42 D in eyes previously submitted to myopic Lasik, and +0.05 ± 1.76 D in those submitted to hyperopic surgeries. Had we inputted post-K values derived from keratometer and from topography, we would have obtained significantly higher postoperative refractive errors in eyes previously submitted to myopic refractive surgery (p < 0.05). Refractions using pre-K derived from the central 8 mm Orbscan instead of 43.8 D were similar in all studied groups (p > 0.05). Anterior chamber depth measured with IOL Master or Orbscan were similar.

Conclusions

Orbscan measurements used as the post-K values into the double-K method provide a precise IOL calculation, especially in post myopic refractive surgery patients.

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Authors and Affiliations

  1. Department of Ophthalmology, Hospital de Clínicas de Porto Alegre, Federal University of Rio Grande do Sul, Av. Dr. Nilo Peçanha, 724/401, ZIP: 90.470-000, São Paulo, Brazil

    Sérgio Kwitko, Diane R. Marinho, Samuel Rymer & Norton Severo

  2. OftalmoCentro, Porto Alegre, Brazil

    Sérgio Kwitko & Diane R. Marinho

  3. Department of Ophthalmology, Federal University of São Paulo, São Paulo, Brazil

    Carlos G. Arce

Authors
  1. Sérgio Kwitko
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  2. Diane R. Marinho
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  3. Samuel Rymer
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  4. Norton Severo
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  5. Carlos G. Arce
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Corresponding author

Correspondence to Diane R. Marinho.

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The authors do not have any financial interest.

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Kwitko, S., Marinho, D.R., Rymer, S. et al. Orbscan II and double-K method for IOL calculation after refractive surgery. Graefes Arch Clin Exp Ophthalmol 250, 1029–1034 (2012). https://doi.org/10.1007/s00417-012-1974-z

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  • DOI: https://doi.org/10.1007/s00417-012-1974-z

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