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       XXIV Annual Congress of the Iranian Society of Ophthalmology        بـیــست و چهارمین کنــگــره سـالیـانه انـجـمـن چـشـم پـزشـکی ایـــران
مقاله Abstract


Title: Central Corneal Thickness in Highly Myopic Eyes: Inter-device Agreement of Ultrasonic Pachymetry, Pentacam and Orbscan II Before and After Photorefractive Keratectomy.
Author(s): Nassiri N, Sheibani K, Safi S, Nassiri S, Ziaee A, Haji F, Mehravaran S, Nassiri N.
Presentation Type: Poster
Subject: Cornea and Anterior Segment
Others:
Presenting Author:
Name: Nader Nassiri
Affiliation :(optional) Imam Hossein Medical Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
E mail: lalehofspring@yahoo.com
Phone: 22018765
Mobile: 09121465087
Purpose:

To determine inter-device agreement for central corneal thickness (CCT) measurement among ultrasound pachymetry, rotating Scheimpflug imaging, and scanning slit corneal topography in highly myopic eyes before and after photorefractive keratectomy (PRK).

Methods:

This prospective comparative study included 61 eyes of 32 patients with high myopia who underwent PRK. Six month postoperative CCT values were compared to preoperative values in 27 patients (51 eyes) who completed the follow up period. To determine the level of agreement, Pentacam and Orbscan II readings were compared to ultrasonic pachymetry measurements as the gold standard method.

Results:

Mean CCT measurements with ultrasound, Pentacam, and Orbscan II before PRK were 557µm, 556µm, and 564µm, respectively; and 451µm, 447µm, and 438µm 6 months after surgery in the same order. Preoperatively, the 95% limits of agreement (LoA) with ultrasound measurements were -20μm to 17μm for Pentacam and -21μm to 33μm for Orbscan II. Six months postoperatively, the 95% LoA were -30μm to 23μm for Pentacam and -69μm to 43μm for Orbscan II.

Conclusion:

Preoperatively, CCT measurements were higher with Orbscan II as compared to ultrasound. Postoperatively, both Pentacam and Orbscan II measurements were lower than those obtained with ultrasound, but Pentacam had better agreement.

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  - بـیــست و چهارمین کنــگــره سـالیـانه انـجـمـن چـشـم پـزشـکی ایـــران