Limitations of the Heidelberg Retina Tomograph.

Glaucoma is a progressive optic neuropathy where damages that occur at the optic nerve head and the retinal never fiber layer are associated with changes in the visual field. The Heidelberg Retina Tomograph (Heidelberg Engineering, Carlsbad, CA), a scanning laser ophthalmoscope, performs a three-dimensional topographic analysis of the optic nerve head and the retinal never fiber layer. The Heidelberg Retina Tomograph has been reported to be a reliable and objective method of identifying structural changes prior to the occurrence of visual field defects. In our series of patients, all had significant visual field defects but normal Heidelberg Retina Tomograph results, including rim area and Moorfield regression analysis. It is important to recognize that interpreting the Heidelberg Retina Tomograph results alone may be misleading; however, when combined with careful clinical evaluation of the optic nerve head and the visual field, the Heidelberg Retina Tomograph may provide valuable information in assisting the clinician with the diagnosis and management of glaucoma.