To evaluate thinnest pachymetry and posterior corneal elevation measurements between Orbscan-II slit scanning and Galilei double Scheimpflug devices.

Seventy eyes of 35 consecutive LASEK candidates simultaneously examined with Orbscan-II and Galilei for parameters of posterior corneal elevation and thinnest pachymetry. All patients operated and at least one month after surgery, above parameters measured again with these two systems.

Mean age of patients was 29.66 years, (20-44 years). Twenty two patients were female and 13 were male. Mean preoperative thinnest pachymetry measured by Orbscan-II and Galilei were 540.04 µm±40.46 (SD) and 547.54 µm ±32.14 (SD) respectively. Mean preoperative posterior elevation measured by Orbscan-II and Galilei were 6.825±0.2745 and 6.329±2.2245 respectively. Mean postoperative thinnest pachymetry were 458.58 µm±44.54 (SD) and 481.03 µm ±45.88 (SD) respectively. Mean postoperative posterior elevation measured were 6.99±0.04 and 7.25±0.45 respectively. A significant difference was noted between two devices in thinnest pachymetry measurements pre and post-operatively (P<0.0001), but there was no pre and post-operative statistically significant difference in posterior elevation between these two devices (P=0.085 and P=0.58 respectively).

Thinnest pachymetry measurements obtained by Orbscan-II and the Galilei cannot be used interchangeably pre and post-operatively. However, Orbscan-II and the Galilei measurements can be used interchangeably with posterior elevation measurements.