Correcting Astigmatism

Correcting Astigmatism with Cataract Surgery

Astigmatism correction during cataract surgery will improve your visual outcome, especially with specialty multifocal lenses that reduce or eliminate your dependence on glasses. This can be achieved by any of the following methods:

  • Toric Intraocular Lenses (Toric IOL) – A Toric IOL is a monofocal IOL that corrects for astigmatism. Corneal topography measurements will determine the axis of astigmatism to which this lens needs to be oriented, and proper placement can eliminate up to two diopters of preexisting corneal astigmatism.
  • Limbal Relaxing Incision (Astigmatic Keratotomy) – Limbal relaxing incisions are made on the corneal surface using specialized blades. These incisions of predetermined specific length and location can relieve existing astigmatism. These incisions do require specific testing and skills, and fortunately Dr. Iskander has performed numerous LRIs in his time at San Antonio Eye Specialists. Although slightly less predictable than Toric IOLs, LRIs can eliminate up to two diopters of corneal astigmatism. They are usually combined with multifocal lenses for optimum effect.
  • Combination of Toric Intraocular Lens and Limbal Relaxing Incision – A combination of both Toric IOLs and limbal relaxing incisions can be used to eliminate higher degrees of astigmatism, up to four diopters.