The principal advantage of Dual Scheimpflug imaging is that corresponding corneal thickness data from each view can simply be averaged to compensate for unintentional misalignment, which results in a corrected measurement value at the corresponding location. The dual Scheimpflug imaging principle is independent of inclined surfaces, and thus allows accurate pachymetry without knowledge of the actual decentration of the slit from the apex.

Living human eyes are always in motion even under perfect fixating conditions, and scanning takes time. Therefore, the rotational device axis may become decentered from the aligned apex position during the course of the rotational scan acquisition. In this situation, the projected slits impinge upon the anterior surface of the cornea inclined, resulting in two apparent slit images deviating from each other in thickness. The reciprocal relationship of the dual views allows simple averaging of the corresponding thickness values to correct the values at each of the slit positions. The dual Scheimpflug system has only to take into account decentration and allocate each averaged thickness and posterior height value to its proper location, whereas single Scheimpflug systems additionally have to make estimations on the variable surface inclination for calculating correct thicknesses or posterior heights.

The Dual Scheimpflug technique is intrinsically faster than other devices that rely on a single Scheimpflug techqniue, by requiring only 180° camera rotation instead of 360° rotation.

The GALILEI G2 can therefore perform a complete scan, acquiring up to 60 Scheimpflig frames, in less than one second. The short recording time makes the GALILEI G2 easy on the patient, who is not forced to keep the eye open for a prolonged time.