Itrace toric lens alignment11/14/2023 George Waring IV, MD, FACS, founder and medical director of the Waring Vision Institute in Mount Pleasant, South Carolina, believes it’s essential to base your toric lens choice on at least two measurements. ![]() ![]() Corneal topography is essential, especially in patients who’ve had previous corneal refractive surgery.” “However, relying on something like keratometry alone is just not sufficient. “Keratometry is the classic way of measuring astigmatism, and today most of us calculate lens power using advanced instruments like the IOLMaster or Lenstar that do take keratometry into account,” he says. Chu notes that just doing keratometry isn’t sufficient. “When thinking about implanting a toric IOL, surgeons need to shift from looking at the astigmatism in the patient’s refraction to seeing what topography reveals.”ĭr. “That not only defines the magnitude of corneal astigmatism on the anterior corneal surface, it also helps define the type of astigmatism-regular or irregular,” he says. Ralph Chu, MD, founder and medical director of Chu Vision Institute in Bloomington, Minnesota, and adjunct associate professor of ophthalmology at the University of Minnesota, says the most critical measurement when implanting a toric lens is topography. What should I use to determine toric power and orientation? With that in mind, several surgeons with extensive experience implanting toric IOLs answer 11 key questions to help make sure you end up with happy toric IOL patients.ġ. Nevertheless, they do require making some extra effort and managing the occasional pitfall. ![]() A lthough toric intraocular lenses are considered a “premium” option-one that can have a profound impact on a patient’s vision-they involve far fewer potential visual tradeoffs than premium options such as multifocal IOLs.
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