Astigmatism marking for the cataract patient

Toric IOLs are now widely used to correct astigmatism for patients undergoing cataract surgery.

A cylinder component within the toric IOL corrects the astigmatism, so that light focuses properly on the retina. To do this, the cylinder component in the IOL must be aligned specifically to counteract the astigmatism coming from the cornea. The angle of the astigmatism is marked on the cornea to help you do this.

Several methods have been developed for astigmatism marking. This activity will discuss some of the corneal marking methods available and the challenges that arise with them.

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