Review: The Kowa nonmyd WX 3D

Remember the first time you viewed the optic disc using stereo slit-lamp biomicroscopy? Seeing the disc in detailed relief immediately made assessment of its structure much easier, more accurate, and less likely to suffer inter-observer variation. The ability to capture this appearance with 3D photography, therefore, is a valuable asset to any glaucoma screening programme, or indeed wherever any three-dimensional structural details needs to be recorded, analysed or transferred for further opinion.

Harper and Spry¹ noted that ‘stereoscopic photography is the option of first choice because rim loss may be underestimated and observer agreement reduced when using monoscopic photographs and cup-depth determination is less reliable with the non-simultaneous stereoscopic images’. When they wrote this, the technology allowing you to view stereoimages on a 3D screen was of limited availability and 3D tended to be achieved by convergence of side by side disparate images or by a flicker presentation method.