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Combines placido disk topography with Sheimpflug tomography of the anterior segment. Sirius provides informati on on pachymetry, elevati on, curvature and dioptric power of both corneal surfaces over a diameter of 12 mm. All biometric measurements of the anterior chamber are calculated using 25 secti ons from the cornea. Measurement speed reduces the eff ect of eye movement producing a high quality accurate measurement. In additi on to the clinical diagnosis of the anterior segment the most common uses are: refracti ve and cataract surgery, an IOL calculati on module is available. Objecti ve examinati ons provide an accurate mea- surement of pupil diameter in scotopic, mesopic and photopic conditi ons. when combined with the corneal map they can be used for refracti ve surgery planning and follow-up.