Potential difficulty score
| Co-morbidity | Score |
|---|---|
| General condition | |
| Unable to lie flat | |
| (spinal deformity, asthma, heart failure) | 1 |
| Severe anxiety | 1 |
| Head tremors | 1 |
| Ocular history | |
| Previous angle closure glaucoma | 1 |
| History of complications in fellow eye | 1 |
| Previous vitrectomy plus or minus silicone oil | 1 |
| Ocular co-morbidity | |
| Corneal cloudiness | 1 |
| Shallow anterior chamber | 1 |
| Poor pupillary dilatation and/or posterior synaechiae | 1 |
| Pseudoexfoliation | 1 |
| Weak zonules | 1 |
| High hypermetropia (axial length <20) | 1 |
| High myopia (axial length >27) | 1 |
| Cataract density | |
| Nuclear density grade 1–2 | 1 |
| Nuclear density grade 3 | 2 |
| Mature brunescent cataract | 3 |