Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Progression of diabetic retinopathy
[33] RCT	46 people with bilateral cataract and diabetes, 34/46 (78%) of whom had retinopathy	Proportion of eyes with postoperative cystoid macular oedema 6 months 6/39 (15%) eyes with phaco extracapsular extraction 6/38 (16%) eyes with manual large-incision extracapsular extraction	P = 1.0		Not significant
[33] RCT	46 people with bilateral cataract and diabetes, 34/46 (78%) of whom had retinopathy	Progression of diabetic retinopathy in the first year 1 year 15/46 (33%) eyes with phaco extracapsular extraction 14/46 (30%) eyes with manual large-incision extracapsular extraction	P = 0.8		Not significant
[33] RCT	46 people with bilateral cataract and diabetes, 34/46 (78%) of whom had retinopathy	Development of severe high-risk retinopathy 1 year 1/36 (2%) eyes with phaco extracapsular extraction 3/46 (7%) eyes with manual large-incision extracapsular extraction	P = 0.2		Not significant