Cassini with SoftwarePut an end to unexpected refractive outcomes
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Expert Analysis

Your GPS for Astigmatism Correction

Cassini uses patented multi-colored LED point-to-point ray tracing to provide a GPS-like analysis of the cornea along with high-resolution images utilized for surgical guidance. The unique measuring principle enables highly accurate and repeatable measurements of the TCA.

  • Our Services include

  • Installation and assistance

  • Continuous education to staff members

Why Posterior Corneal Astigmatism Matters

  • In Koch et al., anterior corneal measurements underestimated Total Corneal Astigmatism (TCA) by 0.22 D @ 180° and exceeded 0.50 D in 5% of eyes
  • Ignoring posterior corneal astigmatism may yield incorrect estimation of TCA¹
  • Selecting toric IOLs based on anterior corneal measurements alone could lead to overcorrection in eyes that have WTR astigmatism and undercorrection in eyes that have ATR astigmatism¹


    [1] Koch DD, et al. Contribution of posterior corneal astigmatism to Total Corneal Astigmatism. J Cataract Refract Surg. 2012;38:2080-2087.


Some testimonials from our doctors that have used Cassini over the years

83% Post Op within 0.5 Diopter

Jonathan Solomon, MD

I find Cassini to be very accurate, with new software for Total Corneal Astigmatism i believe it will surpass other topography, and raise the bar for even better outcomes.

Margaret Tinsdale, MD FACS

Understanding posterior astigmatism is important and now Cassini offers an insight to improve planning

Andrew Johnson,MD