However, the most widely used area of application for HRT is the inspection of the optic nerve head (papilla) for early detection and follow-up of glaucoma.

The optic nerve and retina are illuminated through a single pinhole, and the light returning from the area of interest results in a 2D image.

[3] Another important advantage is that it is more comfortable for the patient as the laser only illuminates the area of interest with a low light intensity and short duration (1.6 seconds).

During the examination, a laser beam passes through the pupil opening onto the back of the eye and scans the optic nerve head and the retina.

A three-dimensional image is generated from several tens of thousands of measuring points, which allows a quantitative assessment of all relevant anatomical structures:[5] These stereometric parameters are compared with extensive databases and thus enable the eye to be classified taking into account the individual papillae size and the patient's age.