Corneal Topography

As an alternative to entering corneal radii by hand, they can be taken also from a two-dimensional corneal topographic mapping. OKULIX calculates the radii and the numerical eccentricity from the raw data by a three-dimensional numerical fit algorithm ⁶. It should be taken into account that for the following retinal images the real corneal topography is used (not the fit function). This mode is indicated by a blue field "cornea active" in the upper right corner of the retinal image until this mode is deactivated again by pressing the button "cancel" in the CORNEA branch of the program.
Up to now, corneal topographic images are supported from the following devices:

1. Technomed C-Scan
2. Oculus Keratograph / Easygraph
3. Tomey TMS2, TMS3, TMS4
4. Zeiss/Humphrey Atlas
5. Keratron Scout
6. Eye-Top CSO

Interfaces to other systems are in preparation. The corresponding data files have to be copied into the OKULIX directory to be recognized from the program. For the Technomed C-Scan, the files in ASCII-format, type I have to be used. For the Oculus Keratograph, it is recommended to rename the files CORNEA.OD for the right and CORNEA.OS for the left eye, e.g. by the name (or a part thereof) of the patient because the patient’s name is not contained in the data file. For Tomey, the three files RADxxx.DAT, DIOxxx.DAT and XREFxxx.DAT have to be used, where xxx is a unique number generated by the Tomey TMS. OKULIX generates a new file TOMxxx.CMP from these three files. Also the files generated by the Zeiss/Humphrey Atlas should be renamed prior to copying as they do not contain any information about the patient’s name.

TMS-Workstation (old version)

OKULIX can also be installed inside a Tomey-TMS-system. If topographic data are requested by the user, the program askes if a new topography has to be measured or if already recorded data shall be used. If new topography is selected, the TMS software is automatically started. After finishing the measurement, the file containing the new data is highlighted in the file directory and can be simply selected by clicking to ok.

TMS4-Workstation (new version)

From summer 2006 the Tomey TMS4-topographer supports direct call of and data transfer to OKULIX. When OKULIX is called, the actual topography is transferred to OKULIX, and the data extracted from it by OKULIX are directly used for IOL calculation. In OKULIX up to four IOL models are calculated simultaneously. The user has to select these IOL at start out of a list of all IOL models. This selection can be again modified at any time later. The actual topography can also be stored within the OKULIX software environment.

During the OKULIX calculations started from TMS software, the TMS software must not be called a second time, as this could mix up data of different eyes.