The instrument is similar in appearance to most modern desktop autorefraction or topography units, with the now increasingly essential tiltable touch screen facing you and a Placido disc type cone towards the patient (Figure 1). This one machine, however, functions as an autorefractor, keratometer, topographer, pupillometer and wavefront aberrometer. It can detect media changes through retroillumination, aid biometry in IOL positioning and power calculation, and make both photopic and mesopic measurements to aid accuracy of refraction prescribing. So does this multiplicity of function make operation complicated? Well I can confirm that operating the OPD-Scan III is amazingly simple and a complete scan takes just 10 seconds per eye.
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