Shallow limbal relaxing incisions will have much less effect with almost no effect if the cuts are less than 50% corneal depth. The smallest optical zone diameter recommended is about 8 or 9 mm. Incisions are made at the opposite edges of the.
An overlay of the incisions is then visible on the surgical. Limbal relaxing incisions (LRI) are a refractive surgical procedure to correct minor astigmatism in the eye. Then, we begin the surgical procedure by docking the laser onto the cornea. This information is all downloaded onto the femtosecond laser. We have set our distance from the visual axis at 8 mm. Incisions which are more central in the cornea will also cause more astigmatic flattening, however the more central the incision, the higher the risk of corneal irregularity. The depth of our incisions is 85 of the corneal pachymetry in the area of the incision. The larger the arc length of the incision, the larger the degree of corneal flattening at that meridian. You do not need to change your IOL calculations if you are planning a limbal relaxing incision at the time of cataract surgery. This is because the coupling ratio is about 1: for every diopter of flattening in one meridian, there will be about the same 1 diopter of steepening in the other meridian. Note that the spherical equivalent of the refraction and the average keratometry do not change. The corneal coupling effect means that if we flatten the cornea in one meridian then it will steepen in the meridian 90 degrees away. Note that these incisions are actually inside the limbus, in the clear cornea, but the name LRI has stuck. Limbal Relaxing Incisions or Arcuate Relaxing Incisions are a vision correction procedure that can help reduce astigmatism and thereby improve your vision. This video will review the concepts and technique of using limbal relaxing incisions (LRIs) to treat corneal astigmatism. And we have demonstrated a technique using paired phaco incisions to help treat even more astigmatism.
#Limbo relaxing incision how to
We have shown how to place the phaco incision on the steep axis to help reduce astigmatism. Throughout the 1990’s, a number of authors recognized the advantages of moving corneal astigmatic relaxing incisions peripherally toward the limbus. The corneal power in that meridian is slightly weakened by creating partial depth incisions either with a blade or a laser. Just about any incision in the cornea will induce some astigmatic change. Corneal relaxing incisions treat the astigmatism on the cornea itself by flattening the steep meridian so that the cornea becomes more spherical.
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