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FDA approves Tecnis toric calculator improvement
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The FDA granted premarketing approval for a software update to Abbott’s Tecnis toric calculator, which will allow the option of adding the posterior corneal astigmatism factor into lens calculations, according to the FDA website.
The addition of posterior corneal astigmatism compensation “eliminates the need for look-up tables and improves the predictability of residual astigmatism,” according to company correspondence.
Failing to account for posterior corneal astigmatism in toric lens calculations can result in overcorrection or undercorrection of astigmatism, according to the correspondence.
“By incorporating posterior corneal power and an exact vergence calculation for both toric and spherical IOL power, the new Tecnis toric IOL calculator elegantly and comprehensively addresses posterior corneal astigmatism and potential inaccuracies,” Douglas D. Koch, MD, who helped develop the algorithm used in the calculator, said in the correspondence.