Purpose:This study was designed to compare between Limbal relaxing incisions and Penetrating limbal relaxing incisions in the management of astigmatism during cataract surgery.Design: Prospective, comparative, non-randomized case series.Setting: Cairo university hospitals (Kasr EL-Aini; Ophthalmic surgical department)Patients and methods:Our study was divided into two groups, group A; 20 eyes of 20 cases LRIs and group B; 20 eyes of 20 cases PLRIs. Limbal relaxing incisions entail performing one or two limbal incisions along the steepest meridian with a depth of 450-600μ using a preset blade set at the required depth. Penetrating limbal relaxing incisions entail performing two full thickness incisions using a keratome knife along the steepest meridian, in addition to the clear corneal stab incision of the phacoemulsification.The main outcome measures include: UCVA, BCVA, and manifest refraction. Corneal topography was done for all patients at 1 week postoperative.Results: At 1 week postoperative, the average change in corneal cylinder (Δchange) was found to be 1.178 D, SD 0.338 in the LRI group and -0.095 D, SD 0.846 in the PLRI group.Conclusion: The use of LRIs has been shown to be extremely safe and reliable. In the setting of concomitant lens surgery, our data indicate that this technique provides for more predictable astigmatic outcomes as compared to the use of PLRIs, and yields more consistent results than when relying solely upon a tailored phaco incision