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Simulated Experiments on IOL Power Calculation Using Anterior Segment OCT

Simulated Experiments on IOL Power Calculation Using Anterior Segment OCT. Dong Hyun Jo, M.D., 1,2 Mee Kum Kim, M.D., 1,2 Won Ryang Wee, M.D. 1,2. Financial disclosure: All authors have no proprietary interest in methods described in this article.

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Simulated Experiments on IOL Power Calculation Using Anterior Segment OCT

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  1. Simulated Experiments on IOL Power Calculation Using Anterior Segment OCT Dong Hyun Jo, M.D.,1,2 Mee Kum Kim, M.D.,1,2 Won Ryang Wee, M.D.1,2 Financial disclosure: All authors have no proprietary interest in methods described in this article. 1Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea, 2Seoul Artificial Eye Center, Seoul National University Hospital Clinical Research Institute, Seoul, Korea

  2. Purpose • To compare the method of calculating intraocular lens (IOL) power by anterior segment optical coherence tomography (AS-OCT) with the clinical history (Single-K) and Double-K methods

  3. Methods • Patients • who had undergone LASEK from July 1, 2009 to June 30, 2010 • Preoperative and postoperative examinations • Best spectacle-corrected visual acuity • Intraocular pressure • Anterior and posterior segment examinations • Slitlamp biomicroscopy • Funduscopy • Automated keratometry • Anterior segement optical coherence tomography (AS-OCT) • LASEK was performed using Visx Star S4 (VISX Inc., Santa Clara, CA).

  4. Methods • Methods of IOL power calculation: SRK/T formula • Double-K method: devised by Aramberri • Preoperative keratometric value → anterior chamber depth (ACD) • Postoperative keratometric value → the power of IOL • Single-K method: “Clinical history” method • AS-OCT method • we utilized corneal height (Ch) as measured by AS-OCT in the IOL power calculation

  5. Methods: AS-OCT method Ch 2, 3 1 1. A horizontal line was drawn to connect both ends of the anterior chamber angles 2. A vertical line was drawn from the posterior surface of the corneal vertex to fall on the horizontal line. 3. The length of the vertical line was designated as Ch.

  6. Methods • Comparison of Ch according to myopic status before and after the refractive surgery • Low myopia (>-3 D) • Moderate myopia (≤-3 D, >-6 D) • High myopia (≤-6 D) • Comparison of the results among 3 methods with each other

  7. Results • Demographic, Refractive, and Keratometric Data: 73 eyes of 37 patients

  8. Results • Comparison Between Preoperative and Posoperative ChAccording to the Preoperative Myopic Status Chpre = preoperative corneal height; Chpost = postoperative corneal height; Δ Ch = difference between preoperative and postoperative cornealheight *P < 0.05

  9. Results • Corneal Height Estimated Using the Different Methods The differences between values obtained with AS-OCT method and those obtained with the other 2 methods were statistically significant (P < 0.001 in both analyses).

  10. Results • Intraocular Lens Power Calculated Using the Different Methods Pemme: IOL power to get emmetropia Pemme obtained using AS-OCT method was higher than that obtained using the Single-K method lower than that obtained using the Double-K method . (P < 0.001 in both analyses)

  11. Conclusions • We demonstrated that Ch as measured by AS-OCT could be utilized in IOL power calculation after corneal refractive surgery.

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