Posters

Comparison of corneal measurements in keratoconus eyes using rotating Scheimpflug camera (Pentacam) and scanning-slit topography (Orbscan IIz)

Poster Details

First Author: I.El Jazouli MOROCCO

Co Author(s): C. Filali Amine   O. Merimi   A. Bennis   F. Chraibi   M. Abdellaoui   I. Benatiya Andaloussi     

Abstract Details

Purpose:

To compare the corneal measurements obtained by rotating Scheimpflug camera (Pentacam) and Scanning -slit topography (Orbscan IIz) in keratoconus eyes.

Setting:

Department of ophthalmology, Omar Drissi Hospital, Hassan II Hospital University Center, University  Sidi Mohamed Ben Abdellah, Fez, Morocco

Methods:

A total of 36 patients, (72 eyes) with the diagnosis of keratoconus (KC) were enrolled in this study. A complete eye examination was performed in all cases including analysis of Steep keratometry, flat keratometry, maximum keratometry, central corneal thickness (CCT), thinnest corneal thickness (TCT), posterior and anterior elevation above the best-fit sphere with two devices: Pentacam (Occulus)  and Orbscan (BAUSCH & LOMB). Statistical analysis were assessed by SPSS using Z test.

Results:

There was no significant difference between the two instruments for the measurement of the flat, steep and maximal keratometry (p>0.05). However, there was significant difference between the two devices for the measurement of CCT (p=0.02) and TCT (p=0.003), the mean measurements were respectively 438.3 ±46.36µm, 419.54± 56.56µm for the Pentacam, and was 414.55 ±56.47 µm, 391.72± 55.38 µm for the orbscan. No significant difference was found for the posterior and anterior elevation above Best-Fit Sphere between pentacam (25.44 ± 15.78 and 57.36 ± 30.67 respectively) and Orbscan (42.28 ± 26.2 and 90.36 ± 42.99 respectively) with p>0.05.

Conclusions:

Both the Pentacam and Orbscan IIz determine comparable measurements of keratometry (flat, steep and max K) but have a measurable difference in CCT, TCT. This difference may be important in the screening of patients for refractive surgery.

Financial Disclosure:

None