Risk factor	Risk Score
Previous vitrectomy	1
Corneal scarring	1
Small pupil (<3mm)	1
Shallow anterior chamber (< 2.5 mm)	1
Age (> 88 years)	1
High ametropia (>6 D myopia or hyperopia)	1
Posterior capsule plaque	1
Posterior polar cataract	1
Miscellaneous risks assessed by surgeon e.g. poor positioning of eye/patient	1
Brunescent/white/dense/total cataract	3
Phacodonesis	3
Pseudoexfoliation	3
Total	18