Study of Induced Astigmatism After Cataract Surgery by Phacoalternative

Abstract

The objective is to study the astigmatism induced after phacoalternative surgery in order to improve the quality of the surgery. This was a prospective and descriptive cross-sectional study carried out at the Donka University Hospital in Conakry from july 2021 to january 2022, i.e. a duration of 7 months, on 100 operated eyes. It involved 100 eyes, operated by phacoalternative with an upper limbal incision of at least 6 mm and implantation in the lens bag. Automatic refraction was performed pre-operatively and post-operatively at 45ᵉ day. The mean age was 62 years. Visual acuity was reduced to light perception in 58% of cases preoperatively. The mean implant power after biometry was 19±2.38 Dioptres (D); 50% of patients received the calculated implant. Corneal oedema was the most frequent early complication. Regarding the functional outcome, 82% of the eyes had an uncorrected visual acuity greater than 3/10 at D45 and 92% with correction. 95% of preoperative astigmatism was less than 2D and 57% according to the rule. The average postoperative astigmatism induced was 3.15D against the rule. In conclusion, phacoalternative surgery with a linear superior incision induces an astigmatism against the rule of 3.15 dioptres on average.