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May 28, 2006
LRI and HOA
Review of Ophthalmology May 2006
Limbal relaxing incisions do correct astigmatism after cataract surgery, but at the price of significantly increased HOAs, say researchers at the University of Tsukuba, Japan. In the study, 18 eyes of 18 patients (mean age, 75.3 ±7.2 years, range, 60 to 87) underwent cataract surgery and IOL implantation. The patients had astigmatism of 2 D or more, and logMAR uncorrected VA was 0.10 or worse. A single surgeon made a 550-µm depth incision with a diamond knife along the corneal limbus in the steepest meridian. Uncorrected and best corrected visual acuity, mean spherical equivalent, cylindrical refraction, and wavefront aberration were examined before and one month after surgery.By LRI, logMAR UCVA improved from 0.388 to 0.079 (p<0.0001). LogMAR BCVA changed from -0.041 to -0.071. MSE showed a hyperopic shift from -0.43 ±0.62 D to 0.04 ±0.64 D (p=0.0019). Refractive astigmatism was reduced from -2.90 ±1.20 D to -0.90 ±0.92 D (p<0.0001). Third- (p=0.0093), fourth- (p<0.0001), and total HOA (p=0.0030) of the cornea significantly increased. Ocular fourth-order (p=0.0038) and total HOA (p=0.0498) significantly increased by LRI.575
Posted by mehdi khanlari at May 28, 2006 11:21 PM