Grayson 1994.

Methods	Allocation: randomised Masking: not mentioned Follow up: 24 months Centres: 1 ITT analysis: not mentioned
Participants	N = 80 participants (102 eyes) Diagnosis: POAG and exfoliative glaucoma requiring initial ALT Age: not specified Race: not specified History: not specified
Interventions	1. ALT receiving 50 burns to the superior 180 degrees of the trabecular meshwork (n = 49 eyes) 2. ALT receiving 50 burns to the inferior 180 degrees of the trabecular meshwork (n = 53 eyes)
Outcomes	Failure criteria: further intervention required (either completion of ALT or filtration surgery)
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear