**Welcome to the ASSORT Toric Calculator.**

**This online calculator allows the use of many types of toric intraocular lenses (IOL) commercially available.**

**Features of the ASSORT Toric calculator include:**

**IOL Spherical Equivalent and toricity can be calculated using the SRK/T, Holladay, Hoffer Q, or Haigis formulae.****Calculation of the Effective Lens Position (ELP) supports use of the A-constant, Surgeon Factor (SF), pACD, or Haigis constants.****Spherical power of the cornea is factored into the calculation of toric power of IOL at corneal plane.****Results are presented simply, and relevant vectors are displayed.****Can calculate the effect of postoperative rotation of the toric implant in the case of a refractive surprise.**

**These calculators allow astigmatism analysis of one eye at a time; group analyses may be performed by purchasing the ASSORT or VECTrAK software**