The Heidelberg Retinal Tomograph, or HRT, is a state-of-the art computerized laser device designed to aid in the diagnosis of glaucoma. This non-invasive procedure scans the eye, producing 3-dimensional digital images of the optic nerve and retina. The optic nerve is photographed along with deeper layers of the eye resulting in a 3-dimensional topographic map of the retinal surface.
The HRT is able to digitally perceive the differences between an eye without glaucoma and an eye that exhibits signs of glaucoma even before visual field defects are presented. This allows glaucoma treatment to begin before vision is lost.