Corneal astigmatism commonly overestimated, underestimated

Four diagnostic devices overestimated with-the-rule astigmatism and underestimated against-the-rule astigmatism in cataract surgery, according to a study.The prospective study included 41 eyes of 41 patients. Preoperatively, 17 patients had with-the-rule astigmatism with a corneal steep meridian at 60° to 120°, and 24 patients had against-the-rule astigmatism with a corneal steep meridian at 0° to 30° or 150° to 180°.Investigators used five devices to measure corneal astigmatism before cataract surgery and 3 weeks postoperatively. Toric IOL alignment was recorded at the slit lamp during surgery and 3 weeks after surgery.

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