Optimal incision sites to obtain an astigmatism-free cornea after cataract surgery with a 3.2 mm sutureless incision

Abstract

The results indicate that to reduce astigmatism in eyes with preoperative astigmatism of 0.5 D or more, a limbal 3.2 mm BENT incision should be placed at 10:30 o'clock. To prevent astigmatism postoperatively, the incision should be placed at the steepest meridian in eyes with preoperative astigmatism greater than 0.5 D; for preoperative astigmatism greater than 1.2 D, a 3.2 mm incision at the corneal limbus is insufficient and a wider incision or an additional incision is required.

Evaluation of Opposite Clear Corneal Incision in Controlling Astigmatism in Cataract Patients Undergoing Phacoemulsification Surgery

“…Although astigmatism can be surgically corrected even after the cataract surgery, it is more appropriate to combine the two procedures. 6 Preexisting corneal astigmatism at the time of cataract surgery can be treated by manipulation of cataract incision 7 , limbal relaxing incision 8 , astigmatic keratotomy 9 or implantation of toric intraocular lenses. 4 The astigmatic modifying effect of the cataract incision site [10][11][12] , size [11][12][13] , shape 14 is well documented.…”

Paired opposite Clear Corneal Incision: Time-Related Changes of its Effect and Factors on which those Changes Depend

“…The underlying reason for the lower astigmatic effect of temporal incisions is likely that as sclerocorneal fibers run downwards, such incisions involve less fibers being cut (8), and also that the cornea is 1 mm larger horizontally than it is vertically. Matsumoto et al (24) advise that if preoperative astigmatism is higher than 0.5 D, the major incision should be made on the steep meridian, and in the case of it being above 1.2 D, an incision longer than 3.2 mm or an additional incision should be performed. Corneal astigmatism higher than 1.5 D can be treated by performing 2 opposite corneal incisions (paired OCCI) (10,16,(25)(26)(27)(28)(29)(30), limbal relaxation incision (31), excimer laser treatment, or toric IOL implantation.…”

Comparison of Astigmatism Correction After On Axis Incision and an Additional Limbal Relaxing Incision During Phacoemulsification

“…Motsumoto et al, by placing 3.2 mm corneal limbus incision at the steepest meridien in eyes with preop astigmatism >0.5D resulted in astigmatism free eyes postoperatively. 1 They also suggested that in cases of preoperative astigmatism >1.2 D an additional incision was required. We in our study found that there was a significant reduction in the postoperative astigmatism by placing 3.2 mm Clear Corneal Incision on the steepest corneal axis (On Axis Incision) in group A (p=0.034).…”