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Proceedings Paper

Concept for image-guided vitreo-retinal fs-laser surgery: adaptive optics and optical coherence tomography for laser beam shaping and positioning
Author(s): Ben Matthias; Dorothee Brockmann; Anja Hansen; Konstanze Horke; Gesche Knoop; Timo Gewohn; Miroslav Zabic; Alexander Krüger; Tammo Ripken
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Paper Abstract

Fs-lasers are well established in ophthalmic surgery as high precision tools for corneal flap cutting during laser in situ keratomileusis (LASIK) and increasingly utilized for cutting the crystalline lens, e.g. in assisting cataract surgery. For addressing eye structures beyond the cornea, an intraoperative depth resolved imaging is crucial to the safety and success of the surgical procedure due to interindividual anatomical disparities. Extending the field of application even deeper to the posterior eye segment, individual eye aberrations cannot be neglected anymore and surgery with fs-laser is impaired by focus degradation. Our demonstrated concept for image-guided vitreo-retinal fs-laser surgery combines adaptive optics (AO) for spatial beam shaping and optical coherence tomography (OCT) for focus positioning guidance. The laboratory setup comprises an adaptive optics assisted 800 nm fs-laser system and is extended by a Fourier domain optical coherence tomography system. Phantom structures are targeted, which mimic tractional epiretinal membranes in front of excised porcine retina within an eye model. AO and OCT are set up to share the same scanning and focusing optics. A Hartmann-Shack sensor is employed for aberration measurement and a deformable mirror for aberration correction. By means of adaptive optics the threshold energy for laser induced optical breakdown is lowered and cutting precision is increased. 3D OCT imaging of typical ocular tissue structures is achieved with sufficient resolution and the images can be used for orientation of the fs-laser beam. We present targeted dissection of the phantom structures and its evaluation regarding retinal damage.

Paper Details

Date Published: 20 March 2015
PDF: 8 pages
Proc. SPIE 9307, Ophthalmic Technologies XXV, 93070Z (20 March 2015); doi: 10.1117/12.2077606
Show Author Affiliations
Ben Matthias, Laser Zentrum Hannover e.V. (Germany)
Dorothee Brockmann, Medizinische Hochschule Hannover (Germany)
Anja Hansen, Laser Zentrum Hannover e.V. (Germany)
Konstanze Horke, Laser Zentrum Hannover e.V. (Germany)
Gesche Knoop, Laser Zentrum Hannover e.V. (Germany)
Timo Gewohn, Laser Zentrum Hannover e.V. (Germany)
Miroslav Zabic, Laser Zentrum Hannover e.V. (Germany)
Alexander Krüger, Laser Zentrum Hannover e.V. (Germany)
Tammo Ripken, Laser Zentrum Hannover e.V. (Germany)


Published in SPIE Proceedings Vol. 9307:
Ophthalmic Technologies XXV
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

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