Sensors 2013, 13(3), 3753-3764; doi:10.3390/s130303753
Article

Eye-Tracker-Guided Non-Mechanical Excimer Laser Assisted Penetrating Keratoplasty

1 Institute of Experimental Ophthalmology, Saarland University, Homburg/Saar 66421, Germany 2 Department of Ophthalmology, Saarland University Medical Center, Homburg/Saar 66421, Germany
* Author to whom correspondence should be addressed.
Received: 4 January 2013; in revised form: 4 March 2013 / Accepted: 7 March 2013 / Published: 18 March 2013
(This article belongs to the Section Biosensors)
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Abstract: 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.
Keywords: eye-tracker; trephination mask; computerized penetrating keratoplasty; non mechanical corneal trephination; excimer laser

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MDPI and ACS Style

Janunts, E.; Schirra, F.; Szentmáry, N.; Seitz, B.; Langenbucher, A. Eye-Tracker-Guided Non-Mechanical Excimer Laser Assisted Penetrating Keratoplasty. Sensors 2013, 13, 3753-3764.

AMA Style

Janunts E, Schirra F, Szentmáry N, Seitz B, Langenbucher A. Eye-Tracker-Guided Non-Mechanical Excimer Laser Assisted Penetrating Keratoplasty. Sensors. 2013; 13(3):3753-3764.

Chicago/Turabian Style

Janunts, Edgar; Schirra, Frank; Szentmáry, Nora; Seitz, Berthold; Langenbucher, Achim. 2013. "Eye-Tracker-Guided Non-Mechanical Excimer Laser Assisted Penetrating Keratoplasty." Sensors 13, no. 3: 3753-3764.

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