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Comparison of stereo optic disc photographs from the Nidek 3-Dx and Zeiss retinal cameras.

OBJECTIVE
To compare the Zeiss retinal camera with the Nidek 3-Dx camera for photographic quality and stereo separation.


SUBJECTS
Eleven subjects (22 eyes) were selected from patients referred for optic disc photography.


METHODS
The subjects were photographed using the Nidek 3-Dx camera for simultaneous stereo photographs, and the 30 degrees field and 15 degrees field settings on the Zeiss retinal camera for sequential stereo photographs. Four ophthalmologists qualitatively scored the photographs on a five-point scale for stereo separation and photographic resolution and sharpness. The results from the four observers were averaged and the Friedman two-way analysis of variance used to analyse the results.


CONCLUSIONS
It was found that the stereo separation is significantly better using the Nidek camera when compared with both the 30 degrees and 15 degrees Zeiss results. There was no significant difference in photographic quality between the Nidek and Zeiss 30 degrees photographs. It was also found that the Zeiss 30 degrees images had a significantly higher quality than the Zeiss 15 degrees, which contradicted previous results.