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Pentacam and Orbscan II measurements of posterior corneal elevation before and after photorefractive keratectomy.

 Byoung Jin Ha  ;  Sun Woong Kim  ;  Sang Woo Kim  ;  Eung Kweon Kim  ;  Tae-im Kim 
 JOURNAL OF REFRACTIVE SURGERY, Vol.25(3) : 290-295, 2009 
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Adult ; Corneal Diseases/diagnosis* ; Corneal Topography/methods* ; Dilatation, Pathologic/diagnosis ; Endothelium, Corneal/pathology* ; Female ; Humans ; Male ; Photorefractive Keratectomy* ; Postoperative Period ; Preoperative Care
PURPOSE: To compare the measurements of posterior corneal elevation above the best-fit sphere before and after photorefractive keratectomy (PRK) using two different technologies--Scheimpflug imaging using Pentacam (Oculus) and scanning slit combined with Placido imaging using Orbscan II (Bausch & Lomb). METHODS: In a retrospective observational case series study, 60 eyes measured using Orbscan II and Pentacam before or after PRK were evaluated. The data were analyzed as three groups: preoperative, early postoperative (from 1 to 3 months after surgery), and late postoperative (> 3 months postoperatively but not exceeding 1 year). Anterior chamber depth, posterior best-fit float sphere, posterior central elevation (PCE) above the best-fit sphere, and posterior maximum elevation (PME) above the best-fit sphere in the 6.0-mm zone were analyzed. RESULTS: Posterior central elevation and PME values measured using Orbscan II were greater than those measured using Pentacam (P < .001). Anterior chamber depth values measured using Orbscan II were smaller than those measured using Pentacam in all three groups (P < .001). Using Orbscan II, PCE and PME values for the two postoperative groups were greater than for the preoperative group. Using Pentacam, the PCE values for the three groups were similar, and the PME values for the preoperative and late postoperative groups were similar. CONCLUSIONS: These findings indicate that Orbscan II measurements of posterior corneal elevation before and after excimer laser refractive corneal surgery may not be valid. Pentacam measurement showed no significant change in posterior corneal elevation from before to after excimer laser corneal surgery.
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1. College of Medicine (의과대학) > Dept. of Ophthalmology (안과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Sang Woo(김상우)
Kim, Sun Woong(김선웅)
Kim, Eung Kweon(김응권) ORCID logo https://orcid.org/0000-0002-1453-8042
Kim, Tae Im(김태임) ORCID logo https://orcid.org/0000-0001-6414-3842
Ha, Byoung Jin(하병진)
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