Limbal relaxing incisions (LRI)

Limbal relaxing incisions (LRI) are truly a modification of astigmatic keratotomy (AK), which is a procedure to treat astigmatism. Astigmatism is present when the cornea is not spherical, i.e., it is steeper in one meridian than the opposite meridian 180 degrees away. The cornea with astigmatism may be thought of as being more football shaped rather than basketball shaped. LRI’s are incisions that are placed on the far peripheral aspect of the cornea (the limbus) resulting in a cornea that is more round. The astigmatism is thus reduced and uncorrected vision is improved.

The procedure can be completed in a few seconds after numbing the eye with anesthetic drops. There is usually little if any post-operative discomfort. The procedure is extraordinarily safe and is not associated with glare or starburst, as often occurs with true corneal incisions (RK and AK). Furthermore, the cornea is usually stable within a week, indicating that visual fluctuations have typically resolved by that time interval. 

Limbal relaxing incisions have gained widespread acceptance amongst cataract surgeons where it is often combined with the cataract operation to reduce pre-existing astigmatism. This results in better post-operative vision without glasses. The procedure can also be used in individuals whose primary refractive error is astigmatism.

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Note: Some of the information here was taken and abridged from the web site of the FDA.

LIMBAL RELAXING INCISION information compiled by Dr. Manolette Roque [ Resume | Email ] and initially uploaded on May 1, 2004.

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Last updated on July 31, 2005.