Measurement of Optic Disc Size and Rim Area with Spectral-Domain OCT and Scanning Laser Ophthalmoscopy

Investigative Ophthalmology & Visual Science, 05/11/2012

Heidelberg Retina Tomograph (HRT) overestimates optic disc area compared to spectral–domain optical coherence tomography (SD–OCT). The difference in HRT and SD–OCT disc measurements is mainly due to HRT's magnification correction algorithm although variable definitions of the disc border are also contributory. Rim area measurements from HRT are larger than SD–OCT, likely a result of different definitions for the reference plane and differences in disc area measurements. Disc parameters from the two devices are not interchangeable.

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