Study of safety and efficacy of sub-Tenon and subconjunctival anesthesia in manual small-incision cataract surgery for hard-grade cataracts.

Purpose: The purpose was to study the safety and efficacy of sub-Tenon and subconjunctival anesthesia in manual small-incision cataract surgery (MSICS) in patients with hard-grade cataracts.

Study design: The design of the study was a prospective, observational, and randomized control study.

Materials and methods: A total of 196 eyes, including 98 eyes in the subconjunctival anesthesia group (group A) and 98 eyes in the sub-Tenon anesthesia group (Group B), undergoing MSICS were enrolled in the study. A single surgeon performed all the surgeries. Intraoperative and postoperative pain scores, patient comfort, surgeon's satisfaction, and intraoperative complications were examined.

Results: The mean age of patients in Group A was 66.64 ± 9.95 years and that of patients in Group B was 64.52 ± 9.46. No statistically significant difference was noted in the intraoperative (P = 0.54) and postoperative pain (P = 0.66) scores between the two groups. There was no pain (0 score) in 30% of patients in Group A and 35% of patients in Group B intraoperatively. The average surgical time (P = 0.66) and surgeon's comfort (P = 0.34) were not statistically significant. The mean corneal haze was 0.054 ± 0.12 in group A and 0.065 ± 0.22 in group B (P = 0.45). Two patients in group A required supplemental anesthesia. There were no surgical complications that could compromise visual outcomes. No patients in either group showed alterations in vital parameters or required intravenous sedation.

Conclusion: Both techniques of anesthesia are safe and effective for performing MSICS in hard-grade cataracts. However, it is prudent to choose a technique according to the surgeon's requirements.