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Anterior Eye Imaging with Optical Coherence Tomography

  • D. Huang
  • Y. Li
  • M. Tang
Part of the Biological and Medical Physics, Biomedical Engineering book series (BIOMEDICAL)
Optical coherence tomography [1] (OCT) was first used clinically for retinal imaging. [2] Carl Zeiss Meditec, Inc. (Dublin, CA) has introduced three generations of retinal OCT scanners: OCT1, OCT2, and OCT3 (Stratus). Most ophthalmologists are now familiar with the applications of OCT in clinical retinal imaging. Not surprisingly, the earliest corneal OCT studies [3–7] used a commercially available retinal scanner. However, there are several reasons why retinal scanners are not ideal for corneal and anterior segment imaging.
  1. 1.

    Current retinal OCT scanners are too slow. The current clinical standard for retinal OCT, the Zeiss Stratus system, acquires 400 axial scans per second. While this is adequate for obtaining a spot measurement on the cornea, it is far too slow for mapping the cornea or measuring the width of the anterior chamber. The motion error in the contour of the cornea is obvious in the Stratus OCT image shown in Fig. 31.1.

     
  2. 2.

    The wavelength of retinal OCT systems is approximately 830 nm. This very near infrared wavelength encounters heavy scattering loss in opaque tissues such as the sciera. Optical coherence tomography at this wavelength cannot visualize angle structures such as the scierai spur and angle recess, important landmarks for anterior chamber biometry and narrow angle glaucoma diagnosis.

     

Keywords

Optical Coherence Tomography Central Corneal Thickness Optical Coherence Tomography Image Corneal Thickness Anterior Segment Optical Coherence Tomography 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • D. Huang
  • Y. Li
  • M. Tang

There are no affiliations available

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