Paper Information

Journal:   JOURNAL OF OPHTHALMIC AND VISION RESEARCH   2015 , Volume 10 , Number 1; Page(s) 4 To 9.
 
Paper: 

MEASUREMENT OF CENTRAL CORNEAL THICKNESS USING ULTRASOUND PACHYMETRY AND ORBSCAN II IN NORMAL EYES

 
DOI: 

10.4103/2008-322X.156084

 
Author(s):  SADOUGHI MOHAMMAD MEHDI*, EINOLLAHI BAHRAM, EINOLLAHI NEDA, REZAEI JAVAD, ROSHANDEL DANIAL, FEIZI SEPEHR
 
* DEPARTMENT OF OPHTHALMOLOGY, LABBAFINEJAD MEDICAL CENTER, NO. 23, PAIDARFARD ST., BOOSTAN 9 ST., PASDARAN AVE., TEHRAN 16666, IRAN
 
Abstract: 

Purpose: To compare ultrasound pachymetry and Orbscan II for measurement of central corneal thickness (CCT) in normal eyes.
Methods: The current study was performed at Labbafinejad Medical Center (LMC), Tehran, Iran. Three hundred eyes from 150 healthy individuals referred for keratorefractive surgery were assessed first by Orbscan II and then by ultrasound pachymetry, and CCT values were recorded and compared.
Results: Overall, Orbscan II overestimated CCT as compared to ultrasound pachymetry by about 2.4% (mean values 547.6±34.7 versus 534.8±34.7, respectively, P<0.001). The difference was more significant when CCT was less than 500 microns (mean values 493.2±16.9 versus 479.9±15.6, mean overestimation: 2.6%, P<0.001). There was good linear correlation between the two methods (Pearson’s correlation r=0.968, P<0.0001).
Conclusion: Orbscan II has good correlation with ultrasound pachymetry for measurement of CCT in normal eyes; however Orbscan II should not be used to evaluate corneal thickness before keratorefractive surgeries, as it tends to overestimate corneal thickness and may result in undesirable, low residual stromal thickness.

 
Keyword(s): CENTRAL CORNEAL THICKNESS, ORBSCAN II, ULTRASOUND PACHYMETRY
 
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