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ASSORT Toric IOL Calculator

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