Journal of Refractive Surgery

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Original Article 

Use of the Pentacam True Net CornealPower for Intraocular Lens Calculation in Eyes After Refractive Corneal Surgery

Eung Kweon Kim, MD, PhD; Sang Woo Kim, MD; Beom-Jin Cho, MD; Sun Woong Kim, MD; Ki Yung Song, MD; Tae-im Kim, MD

Abstract

PURPOSE

To assess the accuracy and validity of true net corneal power of the Pentacam system to provide a keratometry reading for calculating intraocular lens (IOL) power in postoperative refractive surgery eyes.

METHODS

Refraction, an automated keratometry reading, and true net corneal power were measured for 30 eyes that required cataract surgery and had previously undergone refractive surgery. Target refraction values calculated with the SRK/T formula using true net corneal power were compared with postoperative manifest refraction values.

RESULTS

Using true net corneal power, the mean deviation from the desired postoperative cataract refractive outcome was 0.47±0.56 diopters (D); the actual refraction was within ±0.50 D of the intended refraction for 70% of eyes (21/30) and within ±1.00 D for 93% of eyes (28/30).

CONCLUSIONS

The true net corneal power can be used as a keratometry reading for eyes with previous refractive surgery requiring cataract surgery. [J Refract Surg. 2009;25:285-289.]

AUTHORS

From Vision Research Institute, Department of Ophthalmology (Sang W. Kim, E.K. Kim, T. Kim) and BK21 Project Team of Nanobiomaterials for Cell-based Implants (T. Kim, E.K. Kim), Yonsei University College of Medicine, Seoul; HanGil Eye Hospital & Laser Center, Incheon (Cho); the Department of Ophthalmology, Soonchunhyang University College of Medicine, Soonchunhyang University Bucheon Hospital, Bucheon (Sun W. Kim); and Myeong Dong Eye Clinic, Seoul (Song), Korea.

The authors have no financial interest in the materials presented herein.

Correspondence: Tae-im Kim, MD, Dept of Ophthalmology, Yonsei University College of Medicine, Seodaemungu Shinchondong 134, Seoul, Korea. Tel: 822 2228 3570; Fax: 822 312 0541; E-mail: tikim@yumc.yonsei.ac.kr

Received: July 10, 2007; Accepted: April 16, 2008

Posted online: July 15, 2008

Abstract

PURPOSE

To assess the accuracy and validity of true net corneal power of the Pentacam system to provide a keratometry reading for calculating intraocular lens (IOL) power in postoperative refractive surgery eyes.

METHODS

Refraction, an automated keratometry reading, and true net corneal power were measured for 30 eyes that required cataract surgery and had previously undergone refractive surgery. Target refraction values calculated with the SRK/T formula using true net corneal power were compared with postoperative manifest refraction values.

RESULTS

Using true net corneal power, the mean deviation from the desired postoperative cataract refractive outcome was 0.47±0.56 diopters (D); the actual refraction was within ±0.50 D of the intended refraction for 70% of eyes (21/30) and within ±1.00 D for 93% of eyes (28/30).

CONCLUSIONS

The true net corneal power can be used as a keratometry reading for eyes with previous refractive surgery requiring cataract surgery. [J Refract Surg. 2009;25:285-289.]

AUTHORS

From Vision Research Institute, Department of Ophthalmology (Sang W. Kim, E.K. Kim, T. Kim) and BK21 Project Team of Nanobiomaterials for Cell-based Implants (T. Kim, E.K. Kim), Yonsei University College of Medicine, Seoul; HanGil Eye Hospital & Laser Center, Incheon (Cho); the Department of Ophthalmology, Soonchunhyang University College of Medicine, Soonchunhyang University Bucheon Hospital, Bucheon (Sun W. Kim); and Myeong Dong Eye Clinic, Seoul (Song), Korea.

The authors have no financial interest in the materials presented herein.

Correspondence: Tae-im Kim, MD, Dept of Ophthalmology, Yonsei University College of Medicine, Seodaemungu Shinchondong 134, Seoul, Korea. Tel: 822 2228 3570; Fax: 822 312 0541; E-mail: tikim@yumc.yonsei.ac.kr

Received: July 10, 2007; Accepted: April 16, 2008

Posted online: July 15, 2008

10.3928/1081597X-20090301-08

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