Author(s): Ewen A, Lee KE, Klein BE,Klein R. Comparability of cup and disk diameters measured from nonstereoscopic digital and stereoscopic film images. Am J Ophthalmol. 2006 Jun;141(6):1126-1128. PMID 16765683
Journal: American Journal Of Ophthalmology, Volume 141, Issue 6, Jun 2006
PURPOSE To compare gradings of optic disk and cup diameters from stereoscopic film and nonstereoscopic digital images.
DESIGN Comparison of techniques.
METHODS setting: CLINIC-BASED.
PATIENT POPULATION Right eyes of 62 adults. observation procedures: Images of the disk were taken through pharmacologically dilated pupils with a 45-degree digital camera (6.3 megapixels) and with a stereoscopic 30-degree film camera. Measurements were taken for vertical diameters of optic disks and cups.
MAIN OUTCOME MEASURES Agreement of disk and cup measurements and cup to disk ratios.
RESULTS Optic disks and cups were slightly smaller when graded from the stereoscopic film images. Cup-to-disk ratios were similar. Correlations between film and digital images measurements were high.
CONCLUSIONS Measurements taken from nonstereoscopic digital images through a dilated pupil were similar to those taken from stereoscopic film images. Lack of stereoscopic effect may lead to small differences in measuring the optic disk and cup diameters. Nonstereoscopic digital imaging may be useful in epidemiologic studies when measures of optic cups and disks are needed.