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Corneal power changes with Scheimpflug rotating camera after hyperopic LASIK.

Woong-Joo Whang1, Young-Sik Yoo2, Choun-Ki Joo2

  • 1Department of Ophthalmology and Visual Science, Yeouido St. Mary's Hospital.

Medicine
|December 19, 2018
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Summary

Accurately measuring surgically induced refractive change after hyperopic LASIK is crucial. Total corneal refractive power (TCRP) using a Scheimpflug camera, particularly in the 5.0mm zone, best reflects these changes.

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Imaging

Background:

  • Surgically induced refractive change (SIRC) assessment is vital post-hyperopic laser-assisted in situ keratomileusis (LASIK).
  • Accurate keratometric measurements are needed to reflect SIRC effectively.
  • Existing methods may underestimate refractive changes.

Purpose of the Study:

  • To evaluate SIRC using manifest refraction and corneal power measurements.
  • To compare automated keratometry and Scheimpflug imaging for SIRC assessment.
  • To identify the best keratometric measurement for reflecting SIRC after hyperopic LASIK.

Main Methods:

  • Retrospective study of 18 eyes after hyperopic LASIK (Schwind Amaris 750S).
  • Preoperative and 12-month postoperative measurements included cycloplegic manifest refraction and keratometry (automated RK-5 and Pentacam Scheimpflug camera).
  • Analysis of Sim K, true net power (TNP), and total corneal refractive power (TCRP) at 2.0-5.0mm zones.

Main Results:

  • Mean manifest refractive spherical equivalent change was 2.32 ± 1.65 D at 12 months.
  • Automated keratometry and Sim K significantly underestimated SIRC (P=.043, P=.048).
  • TNP and TCRP in the 5.0mm zone showed minimal difference (0.05 D, 0.06 D) and high correlation with SIRC.

Conclusions:

  • Anterior corneal power measurements underestimate SIRC after hyperopic LASIK.
  • Pentacam's TCRP at 5.0mm zone accurately reflects SIRC.
  • TCRP is suitable for predicting intraocular lens power and monitoring corneal refractive changes.