title: Peribulbar versus retrobulbar anaesthesia for cataract surgery.
abstract: BACKGROUND
  Cataract is a major cause of blindness worldwide. Unless medically contraindicated, cataract surgery is usually performed under local (regional) anaesthesia. Local anaesthesia involves the blockage of a nerve subserving a given part of the body by infiltration of the area around the nerve with local anaesthetic. The two main approaches in the eye are retrobulbar and peribulbar. There is debate over whether the peribulbar approach provides more effective and safer anaesthesia for cataract surgery than retrobulbar block.
  
  
  OBJECTIVE
  The objective of this review was to assess the effects of peribulbar anaesthesia (PB) compared to retrobulbar anaesthesia (RB) on pain scores, ocular akinesia, patient acceptability and ocular and systemic complications.
  
  
  METHODS
  We searched the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library 2007, Issue 4); MEDLINE (1960 to December 2007); and EMBASE (1980 to December 2007).
  
  
  METHODS
  We included randomized controlled clinical trials comparing peribulbar anaesthesia and retrobulbar anaesthesia for cataract surgery.
  
  
  METHODS
  Two authors independently assessed trial quality and extracted data. We contacted trial authors for additional information, study methodology and missing data. We carried out a descriptive narrative of results as the methods used by the included stories for reporting the outcomes varied. We performed a subgroup analysis for globe akinesia.
  
  
  RESULTS
  We included six trials involving 1438 participants. Two of the six trials had a low risk of bias; the remaining four had a moderate risk of bias. There was no evidence of any difference in pain perception during surgery with either retrobulbar or peribulbar anaesthesia. Both were largely effective. There was no evidence of any difference in complete akinesia or the need for further injections of local anaesthetic. Conjunctival chemosis was more common after peribulbar block (relative risk (RR) 2.11, 95% confidence Interval (CI) 1.46 to 3.05) and lid haematoma was more common after retrobulbar block (RR 0.36, 95% CI 0.15 to 0.88). Retrobulbar haemorrhage was uncommon and occurred only once, in a patient who had a retrobulbar block.
  
  
  CONCLUSIONS
  There is little to choose between peribulbar and retrobulbar block in terms of anaesthesia and akinesia during surgery in terms of acceptability to patients, need for additional injections and development of severe complications. Severe local or systemic complications were rare in PB and RB.
authors.affiliation: Clinical Ophthalmology, National Eye Centre, Western Bye Pass, Nnamdi Azikiwe Way, Kaduna, Kaduna State, Nigeria, PMP 2267. mbalhassan@yahoo.com
authors.forename: Mahmoud Babanini
authors.initials: MB
authors.lastname: Alhassan
authors.forename: Fatima
authors.initials: F
authors.lastname: Kyari
authors.forename: Henry Od
authors.initials: HO
authors.lastname: Ejere
mesh_terms: D000772:Anesthesia, Local / Q000009:adverse effects / Q000379:methods*; D002387:Cataract Extraction / Q000379:methods*; D006801:Humans; D016032:Randomized Controlled Trials as Topic