Eye-Tracker-Guided Non-Mechanical Excimer Laser Assisted Penetrating Keratoplasty
| Autor: | Edgar Janunts, F Schirra, Nóra Szentmáry, Berthold Seitz, Achim Langenbucher |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Swine medicine.medical_treatment non mechanical corneal trephination Excimer Tracking (particle physics) lcsh:Chemical technology Biochemistry Article Analytical Chemistry law.invention Cornea trephination mask Optics Postoperative Complications law medicine computerized penetrating keratoplasty Animals Humans lcsh:TP1-1185 Electrical and Electronic Engineering Instrumentation excimer laser Excimer laser business.industry Masks Conical surface Laser Atomic and Molecular Physics and Optics eye-tracker Tilt (optics) medicine.anatomical_structure Eye tracking Lasers Excimer business Keratoplasty Penetrating |
| Zdroj: | Sensors, Vol 13, Iss 3, Pp 3753-3764 (2013) Sensors (Basel, Switzerland) Sensors Volume 13 Issue 3 Pages 3753-3764 |
| ISSN: | 1424-8220 |
| Popis: | Purpose: The purpose of the study was to implement a new eye tracking mask which could be used to guide the laser beam in automated non-mechanical excimer laser assisted penetrating keratoplasty. Materials and methods: A new trephination mask design with an elevated surface geometry has been proposed with a step formation between conical and flat interfaces. Two recipient masks of 7.5/8.0 mm have been manufactured and tested. The masks have outer diameter of 12.5 mm, step formation at 10.5 mm, and slope of conical surfaces 15°. Its functionality has been tested in different lateral positions and tilts on a planar surface, and pig eye experiments. After successful validation on porcine eyes, new masks have been produced and tested on two patients. Results: The build-in eye tracking software of the MEL 70 was always able to capture the masks. It has been shown that the unwanted pigmentation/pattern induced by the laser pulses on the mask surface does not influence the eye-tracking efficiency. The masks could be tracked within the 18 × 14 mm lateral displacement and up to 12° tilt. Two patient cases are demonstrated. No complications were observed during the surgery, although it needs some attention for aligning the mask horizontally before trephination. Stability of eye tracking masks is emphasized by inducing on purpose movements of the patient head. Conclusion: Eye-tracking-guided penetrating keratoplasty was successfully applied in clinical practice, which enables robust tracking criteria within an extended range. It facilitates the automated trephination procedure of excimer laser-assisted penetrating keratoplasty. |
| Databáze: | OpenAIRE |
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