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This study aimed to define the confocal laser scanning ophthalmoscope (Heidelberg Retina Tomograph [HRT]) parameters that best separate patients with early glaucoma from normal subjects.

A cross-sectional study.

A total of 80 normal subjects and 51 patients with early glaucoma participated (average visual field mean deviation = −3.6 dB).

Imaging of the optic nerve head with the HRT and analysis using software version 1.11 were performed.

The relation between neuroretinal rim area and optic disc area, and cup-disc area ratio and optic disc area, was defined by linear regression of data derived from the normal subjects. The normal ranges for these two parameters were defined by the 99% prediction intervals of the linear regression between the parameter and optic disc area, for the whole disc, and for each of the …