Relative optic cup depth assessments using three stereo photograph viewing methods.

D A Boes; G L Spaeth; R P Mills; M Smith; J E Nicholl; B C Clifton

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PubMed · 8795728

Relative optic cup depth assessments using three stereo photograph viewing methods.

D A Boes·G L Spaeth·R P Mills·M Smith·J E Nicholl·B C Clifton

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Abstract

PURPOSE: A consistent stereoscopic (stereo) effect in disc photographs is important to be certain that apparent depth changes are real and are not the result of artifact caused by a variable stereo angle. The purpose of this study is to compare the accuracy of relative depth assessments using three different stereo photo viewing methods. METHODS: We evaluated the ability of 12 observers to arrange sets of simultaneous stereo photographs (Nidek 3-Dx split-frame slides, Lentec transparencies) and sequential stereo photographs (Zeiss full-frame slides) according to apparent cup depth. Observer arrangements of each set of 10 photographs were compared to a "reference standard" sequence determined from cup depth measurements made by the Imagenet optic nerve analyzer. RESULTS: The median number of sequence errors (n = 6) made by all examiners in arranging the Nidek 3-Dx simultaneous stereo slides was significantly lower than the median number of errors (n = 12) with the Zeiss sequential stereo slides. CONCLUSIONS: Simultaneous stereo slides provide significantly more interobserver consistency for judgements of cup depth than sequential stereo slides.

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D A Boes, G L Spaeth, R P Mills, M Smith, J E Nicholl, B C Clifton. 1996. Relative optic cup depth assessments using three stereo photograph viewing methods.. https://pubmed.ncbi.nlm.nih.gov/8795728/

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