Clinical ophthalmology
Stereoscopic Projection of Cataract Surgery Video and Observer Perception of Intraocular Spatial Relationships
By Lake JC, Moscovici BK and Freitas LL.
Abstract
Purpose
To evaluate whether stereoscopic projection of cataract surgery video changes ophthalmologists' perception of intraocular spatial relationships compared with nonstereoscopic projection, and whether such changes are scene-dependent.
Methods
Prospective, paired, randomized, observer-masked comparative study, conducted in July 2006. A stereoscopic system was assembled from a conventional surgical stereomicroscope by coupling 2 synchronized cameras to its assistant optical paths and reprojecting the images through orthogonal polarizing filters and matching eyewear. Three lens procedures, 2 phacoemulsifications and 1 anterior vitrectomy with scleral-fixated intraocular lens (IOL) implantation, were edited into 22 scenes (11 situations, each in stereoscopic and nonstereoscopic form) shown in a single randomized order to 63 ophthalmologists. Responses were recorded on visual analog scales or as binary answers and compared between modes and against a surgeon-defined perceptual reference; paired mean differences, 95% CIs, effect sizes, numerical P values and Holm-adjusted P values are reported.
