NIDEK OPD-SCAN II Combination Wavefront Aberrometer and Topographer

The OPD-Scan II uses the principle of skiascopic phase difference for refractive map measurement. The retina is scanned with an infra-red light slit beam and the time difference of reflected light is captured by an array of rotating photo detectors over the entire 360 degree meridian of the fundus. The Dynamic Skiascopy system also generates auto-refraction data for the 2.5-mm, 3.0-mm and 5.0-mm zones.

The corneal topography function operates via placido disc technology. By combining these two functions in a single instrument, misalignment problems are minimized and data reliability is enhanced. Further, the OPD-Scan's multiple, simultaneous functions reduce examination time.

The OPD map displays total optical aberrations in dioptric powers. The map shows the total refractive power errors of the cornea, vitreous and lens to correct the eye to emmetropia. All data required to create these customized maps are obtained in a single sitting.

Measurements acquired from four ring zones are from 2 mm to 6 mm at 1-degree intervals to collect 1,440 data points. The display and printouts are easy to read. These printouts will help you educate your patients and give them the best vision correction possible.