Vergleichende Untersuchungen verschiedener kornealer Topographiemessgerate

Translated title of the contribution: Comparative evaluation of different corneal topographical devices

Norbert Koop*, Michael Langholz, Reginald Birngruber, Gerd Geerling, Gerd Otto Bastian

*Corresponding author for this work
1 Citation (Scopus)


Purpose: It is difficult to measure the topography of the cornea with high resolution and visualize it on a map displaying refraction. This is demonstrated by the ongoing improvement and further development of different methods and by the fact that users of these techniques are not always satisfied. Materials and methods: Five different ring projectors were compared. Spherical and aspherical ball standards were used to measure the standard deviation of the refraction of the system. A patient group of eight people with healthy eyes was used to compare the measurement accuracy and operational errors. Some patients were also measured after cataract surgery. The lateral and axial range of the devices was determined. Results: The measurement accuracy for ball standards for the five devices was below 1/8 D. For the in vivo case in the control group it was below 1/4 D for four devices. Furthermore, the reproducibility of the results, the accuracy of angle determination and the influence of mechanical and optical design will be discussed. The study demonstrates applications and limits of this measurement method.

Translated title of the contributionComparative evaluation of different corneal topographical devices
Original languageGerman
Issue number2
Pages (from-to)120-126
Number of pages7
Publication statusPublished - 02.1997

Research Areas and Centers

  • Academic Focus: Biomedical Engineering


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