Design: Hospital-based comparative study with random allocation, single centre
Population: 122 eyes having small incision cataract surgery in India
Primary outcome: Pain, akinesia and anaesthesia-related complications
Effect: Sub-Tenon: faster onset, fewer adverse events; peribulbar: more complete akinesia

An Indian hospital study allocated 122 eyes having small incision cataract surgery (SICS) to peribulbar or sub-Tenon anaesthesia, 61 each, and compared pain, akinesia and complications.

Injection was more painful with peribulbar anaesthesia, which gave more complete akinesia. Sub-Tenon anaesthesia had a faster onset and fewer adverse events, such as subconjunctival haemorrhage and chemosis. The abstract does not report the numbers.

SICS is the workhorse of cataract surgery in India, and needle-free or blunt-cannula anaesthesia reduces the rare but serious risks of sharp-needle blocks. The trade-off is some residual eye movement, which matters more to some surgeons than others.

The study is small, from one centre, and its design is described as observational despite random allocation, so the findings support existing practice rather than establish it.

Sub-Tenon anaesthesia is a reasonable choice for SICS where some eye movement is acceptable.
Expect less complete akinesia than with peribulbar anaesthesia.
Injection was less painful with sub-Tenon in this study.
Choose by surgeon experience and the patient's bleeding risk.

Why it matters

It supports a gentler block for the most common cataract operation in India.

The statistics, in plain English

The abstract reports significance without effect sizes, so the size of each difference is unclear. Rare complications such as globe perforation cannot be compared in a study of 122 eyes.