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Shape Indices seen on a Sirius Corneal Topographic Map (RMS, RMS/A, RMSf/A, RMSb/A). RMS is the deviation in regularity/aberrations (characterized rf, rs, asphericity and Ax) of the corneal surface being examined from the best fit asphero-toric surface. RMS/A is defined as root mean square per area, RMSf/A (μm/mm2) is calculated on the front or anterior surface of the cornea, RMSb/A (μm/mm2) is calculated on the back surface
