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Using a method that takes only corneal front keratometric values into account can result in postoperative undercorrection of astigmatism, researchers concluded after conducting a study involving 64 individuals.
Participants had a toric IOL (Zeiss Torbi 709 M) implanted after cataract surgery. Investigators compared how a standard calculator and the Barrett calculator predicted postoperative refraction and toric lens power values. Among the results:
- There was a 0.19 D undercorrection in the spherical equivalent using the standard calculator.
- Undercorrection of the cylinder was lower for patients who had with-the-rule astigmatism, due to the tendency of overcorrection.
- Less residual postoperative spherical equivalent, sphere, and cylinder were seen with the Barrett calculator when compared with the standard calculator.
Kern C, Kortum K, Muller M, Kampik A, Priglinger S, Mayer W. Comparison of two toric IOL calculation methods. J Ophthalmol. 2018;2018:2840246. doi: 10.1155/2018/2840246.
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