Clinical Study
Eye (2007) 21, 609–613. doi:10.1038/sj.eye.6702285; published online 17 February 2006
Detection of glaucomatous optic nerve head by using Heidelberg topographic maps
M Iester1,2, M Zanini3, P Vittone2 and G Calabria1
- 1Clinica Oculistica, Department of Neurological Sciences, Ophthalmology, Genetic, University of Genoa, Genoa, Italy
- 2Division of Ophthalmology, G Gaslini Institute, Genoa, Italy
- 3Department of Physics, University of Genoa, Genoa, Italy
Correspondence: M Iester, University Eye Clinic, c/o V.le Teano 71/1, 16147 Genoa, Italy. Tel: +010 353 8455; Fax: +010 353 8494. E-mail: iester@unige.it
Received 23 October 2005; Revised 23 December 2005; Accepted 23 December 2005; Published online 17 February 2006.
Abstract
Purpose
To evaluate the capacity of a new topographic map analysis to detect abnormal optic discs from healthy ones in a new cohort of subjects.
Patients and methods
Only one eye was chosen randomly from each subject included in the study. In total, 20 normal eyes with a normal visual field, an IOP of <22 mmHg and no history of glaucoma in their family, and 20 glaucomatous eyes with an abnormal visual field and an open angle were selected. All the subjects were examined with the Heidelberg Retina Tomograph (HRT, Heidelberg Engineering GMBH, Heidelberg, Germany) and Humphrey Perimeter, program 30-2 (Humphrey Instrument, Inc., San Leandro, CA, USA). Topographic maps analysis was performed to each HRT optic nerve head image. Sensitivity, specificity, and diagnostic precision were calculated.
Results
When the topographic map analysis was applied to the group, a sensitivity of 80%, a specificity of 75%, and a diagnostic precision of 77.5% were obtained.
Conclusion
Using the topographic map analysis, the HRT capacity to differentiate normal optic discs from those with glaucoma was similar to those already published in the literature, but using this technique there is no input from the observer to draw the contourline and reference plane is not necessary.
Keywords:
glaucoma, optic nerve head, contourline, reference plane, scanning laser ophthalmoscope, topographic map
