The TMS4a has the comprehensive software: Single, Dual, Multiple & you can even customse your own map with favorite scale, map type & so on. Fourier Analyusis provides you the refractive information with Spherical Equivalent, Regular Astigmatism, Asymmetry & Higer order irregularity. Fourier Analysis provides the refractive information with 3mm & 6 mm diameter range. The software applications, Klyce Statistics, Keratoconus Screening, Enhanced Height & Height Change Maps are also available. Easy plug and play connectivity to Windows 2000 or XP.