COMPARISON OF NIDEK 3DX AND DONALDSON SIMULTANEOUS STEREOSCOPIC DISK PHOTOGRAPHY

We performed a retrospective study on 100 eyes of 55 consecutive patie nts to compare the stereoscopic quality of simultaneous stereoscopic d isk photographs and the reproducibility of optic nerve assessments usi ng the Nidek 3Dx system and the Donaldson fundus camera. Photographs w ere taken on the same eyes on the same dates and reviewed independentl y by one clinician three times in a randomized, masked fashion. Mean c up/disk ratios using the Nidek 3Dx system were similar to mean cup/dis k ratios using the Donaldson camera. There was significantly less vari ability of disk analysis using the Nidek 3Dx system than the Donaldson camera (F = 1.6, P =.01, df = 99). Overall mean stereoscopic quality was significantly better with the Nidek system (3.2 +/- 1.15 S.D.) tha n with the Donaldson camera (2.5 +/- 1.27 S.D., P < .01). Age was the only variable that correlated with stereoscopic quality for both camer as. The new Nidek camera provided significantly better stereoscopic qu ality images than the Donaldson camera and with significantly more rep roducible optic nerve head assessments.