Comparison between central corneal thickness measurements by oculus pentacam and ultrasonic pachymetry.
OBJECTIVE
To compare the accuracy of central corneal thickness (CCT) measurements by the oculus pentacam scheimpflug system, with those obtained with the DGH ultrasound pachymeter (UP) and to assess the agreement between the two devices.


METHODS
In a prospective study, measurement agreement was assessed in 984 eyes of 492 healthy subjects using both oculus pentacam and ultrasonic pachymetry at the Eye Consultants Center, Riyadh, Saudi Arabia.


RESULTS
In the measurement agreement experiment, the mean CCT was 552.4 +/- 37.0 microm with oculus pentacam and 544.1 +/- 35.4 microm with ultrasonic pachymetry. Regression analysis showed a high correlation between the values obtained with both devices (r = 0.912, P < 0.001). Compared with UP, pentacam overestimated the CCT by a mean of 8.2 microm as demonstrated in a Bland-Altman plot.


CONCLUSIONS
the CCT measurements by the pentacam and UP are highly correlated. The pentacam agrees well with UP and is a reliable alternative to UP in CCT measurements.
Al-Mezaine
Hani S
HS
Department of Ophthalmology, College of Medicine, King Saud University, PO Box 230387, Riyadh, 11321, Saudi Arabia. almez2001@hotmail.com
Al-Amro
Saleh A
SA
Kangave
Dustan
D
Sadaawy
Abdulkareem
A
Wehaib
Taher A
TA
Al-Obeidan
Saleh
S
D003315:Cornea / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D003941:Diagnostic Techniques, Ophthalmological; D006801:Humans; D010781:Photography / Q000379:methods; D011446:Prospective Studies; D015203:Reproducibility of Results; D014463:Ultrasonography / Q000295:instrumentation