Comparison of central corneal thickness measured with Orbscan and Pentacam.
OBJECTIVE
To compare central corneal thickness measurements obtained with Orbscan II using the acoustic equivalent correction factor (CF) and Pentacam in eyes screened for refractive surgery.


METHODS
Central corneal thickness in 91 eyes of 51 volunteers with a spherical equivalent refraction ranging from -17.00 to +5.50 diopters (D) (mean: -3.75+/-4.19 D) was measured with both Orbscan II (CF) and Pentacam prior to refractive surgery.


RESULTS
Central comeal thickness measurements ranged from 438 to 610 microm with Orbscan II (CF) and from 472 to 634 microm with Pentacam. The differences between Pentacam and Orbscan II (CF) measurements ranged from -43 to +52 microm (mean: -13.98+/-14.79 microm); these differences were statistically significant (P<.0001). No correlation was found between the difference in central corneal thickness and refractive error.


CONCLUSIONS
These results suggest measurements obtained with the Orbscan II (CF) are thinner than those obtained with the Pentacam. Further studies are needed to determine which instrument is more accurate in measuring central corneal thickness.
Eye Department, 2nd University of Naples, Naples, Italy. nicola.rosa@unina2.it
Nicola
N
Rosa
Michele
M
Lanza
Maria
M
Borrelli
Biagio
B
Polito
Maria Luisa
ML
Filosa
Maddalena
M
De Bernardo
D000328:Adult; D003315:Cornea / Q000473:pathology*; D019781:Corneal Topography; D003941:Diagnostic Techniques, Ophthalmological; D005260:Female; D006801:Humans; D008297:Male; D012030:Refractive Errors / Q000175:diagnosis*