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Monitoring of glaucomatous damage is critical in a modern glaucoma practice. Confocal scanning laser tomograph or Heidelberg Retina Tomograph (HRT) is one of the imaging techniques that allow clinicians to examine more patients and to obtain objectives measurements compared to the gold standard of optic disc stereophotography. It employs a diode laser with a wavelength of 670nm. In a confocal optical system light can only reach the photo detector if it is reflected from a narrow area surrounding the set focal plane. Light reflected outside of the focal plane is highly suppressed (Heidelberg Engineering, 2005). A twodimensional sector of the retina is scanned sequentially. The amount of reflected light at each point is measured using a light sensitive detector. To obtain a topography image (threedimensional image), the height of the retinal surface is computed at each point (Heidelberg Engineering, 2005). Analysis of glaucomatous progression is performed with the HRT operating software by quantitatively describing temporal changes of the optic nerve head topography. It is particularly important as glaucoma progression occurs slowly and changes often are subtle and missed easily. The HRT has the advantage that the new technology enables backward compatibility. So progression can be analysed since the introduction of the first HRT (HRT Classic).

The use of Confocal Scanning Laser Tomography in the Evaluation of Progression in Glaucoma