Korean J Ophthalmol.  2012 Feb;26(1):10-14. 10.3341/kjo.2012.26.1.10.

Which Keratometer is Most Reliable for Correcting Astigmatism with Toric Intraocular Lenses?

Affiliations
  • 1Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea. hyomkim@kumc.or.kr

Abstract

PURPOSE
To evaluate the accuracy of preoperative keratometers used in cataract surgery with toric intraocular lens (IOL).
METHODS
Twenty-five eyes received an AcrySof toric IOL implantation. Four different keratometric methods, a manual keratometer, an IOL master, a Pentacam and an auto keratometer, were performed preoperatively in order to evaluate preexisting corneal astigmatism. Differences between the true residual astigmatism and the anticipated residual astigmatism (keratometric error) were compared at one and three months after surgery by using a separate vector analysis to identify the keratometric method that provided the highest accuracy for astigmatism control.
RESULTS
The mean keratomeric error was 0.52 diopters (0.17-1.17) for the manual keratometer, 0.62 (0-1.31) for the IOL master, 0.69 (0.08-1.92) for the Pentacam, and 0.59 (0.08-0.94) for the auto keratometer. The manual keratometer was the most accurate, although there was no significant difference between the keratometers (p > 0.05). All of the keratometers achieved an average keratometric error of less than one diopter.
CONCLUSIONS
Manual keratometry was the most accurate of the four methods evaluated, although the other techniques were equally satisfactory in determining corneal astigmatism.

Keyword

Astigmatism; Cataract; Keratometer; Keratometric error; Toric intraocular lenses

MeSH Terms

Analysis of Variance
Astigmatism/complications/*surgery
*Cataract Extraction
Female
Humans
Lens Implantation, Intraocular/*methods
*Lenses, Intraocular
Magnetic Resonance Imaging
Male
Prospective Studies
Refraction, Ocular
Reproducibility of Results
Treatment Outcome
Visual Acuity

Figure

  • Fig. 1 Comparison of the preoperative corneal astigmatism as measured by several keratometers. No significant differences were seen between the four groups (p = 0.06). IOL = intraocular lens.

  • Fig. 2 Comparison of the keratometric error of several keratometers. No significant differences were observed between the four groups (p = 0.944). KE = keratometric error; D = diopter; IOL = intraocular lens.


Cited by  2 articles

Comparison of the Refractive Outcomes According to the Differences of Biometry and Keratometry Reading
Kang Hoon Lee, Na Rae Kim, Kyoung Yul Seo
J Korean Ophthalmol Soc. 2013;54(9):1345-1352.    doi: 10.3341/jkos.2013.54.9.1345.

Analysis of Miscorrection after Implantation of the Toric Intraocular Lens
Hye Min Jeon, Kyung Heon Lee
J Korean Ophthalmol Soc. 2014;55(11):1636-1641.    doi: 10.3341/jkos.2014.55.11.1636.


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