Abstract

P 193

Biometry of anterior eye segment using optical coherence tomography

Viestenz A.¹, Vogt S.¹, Viestenz A.¹, Walter S.¹, Langenbucher A.², Behrens-Baumann W.^1
1Department of Ophthalmology, Otto-von-Guericke-University Magdeburg; ²Institute of Medical Physics, University Erlangen-Nürnberg

Objective: Digital visualization of the anterior eye segment becomes more important for refractive surgery. Two commercially available optical coherence tomographs were evaluated.
Methods: 36 eyes were examined by 3 ophthalmologists: complete eye status, central corneal thickness, central anterior chamber depth, axial length (IOL-Master, Zeiss). Three anterior segment scans (horizontal and vertical) were performed using Visante-OCT (Zeiss-Humphrey), SL-OCT (Heidelberg Engineering), and 5x central corneal thickness was measured (AL-1000, Tomey).
Results: The horizontal chamber angle-chamber angle distance was 11.65±0.47 mm (Visante-OCT) in comparison with SL-OCT (12.00±0.57 mm; n=33, p=0,002), vertical scans were comparable in 10 eyes only. The central corneal thickness was 568±61 µm with Visante-OCT and 581±48 µm with SL-OCT (n=35, p=0.03). The ultrasound pachymetry revealed a 12 µm thinner central cornea as the SL-OCT. The anterior chamber depth (3.22±0.69 mm) measured with IOL-Master was nearly similar to Visante-OCT (3.05±0.81 mm, p=0.2) and SL-OCT values (3.07±0.82 mm, p=0.2).
Conclusions: A complete investigation of the cornea-anterior chamber-iris-segment is provided by the horizontal scan compared with the vertical scan. The non contact OCT method is a simply usable tool for visualisation and biometry of anterior eye segment, which is comparable with established measurement techniques.

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