Combination unit improves patient flow dramatically, advanced wavefront axial maps.
Autorefraction seems to over accommodate some myopes, quality concerns with lifespan of hard drive.
Despite being an efficiency boosting, advanced combination unit, the OPD-II has some quality issues which may come into play years after you’ve had it.
Combination instruments that perform 3 or more tasks at once are attractive. They save space on the pre-test table, improve efficiency, and typically save in initial investment from buying multiple instruments. And for that reason alone, the OPD should be an attractive buy for more Optometrists. But the OPD does more than even that- offering wavefront analysis through several aberrometry displays including NIDEK’s OPD map, Wavefront Map, Zernike Graph, and PSF displays. It’s based on the skiascopic phase difference principle, which uses an infrared light slit beam to scan the retina, and then reflects light captured by an array of rotating photo detectors over a 360 degree area. The result is 1,440 potential data points of potential 3D power mapping and more than 6,800 points of topographic reference. The topographic capability of the OPD alone is worthy of high praise, and still rivals that of the newer topography systems we see coming out that lack basic auto-refractive capabilities; it makes sense after all, given that corneal mapping is generally a refractive procedure, that Autorefraction be included. It’s not only a highly esteemed corneal topographer, yet naturally an accurate Autorefractor with auto X-Y-Z tracking functions and auto-capture as well.