Comparison of Optic Disc Measurements between Computer-aided Morphometry and Heidelberg Retina Tomograph

ABSTRACT

PURPOSE: To compare optic disc measurements between computer-aided morphometry and Heidelberg Retina Tomograph (HRT). METHODS: For 59 patients with primary open-angle glaucoma and 9 subjects with ocular hypertension, measurements of the optic disc area and neuroretinal rim area were obtained using our computer-aided morphometric techniques and the HRT. RESULTS: The mean optic disc areas measured with the HRT was smaller than those with the computer-aided techniques (p=0.02). Rim area and rim area to disc area were significantly (pcomputer-aided techniques. The differences between the two methods were most marked in the nasal part of the optic disc. Computer-aided measurements of rim area to disc area correlated significantly (p<0.05) better than HRT determinations of rim area to disc area with mean deviation of visual field analysis.

CONCLUSIONS:

The differences between the two methods should be taken into account when rim measurements of both methods are compared with each other. Computer-aided rim area measurements may more reflect the degree of glaucomatous optic nerve damage than HRT rim area measurements.