Table 1 Points allocated to each risk factor using Habib's potential difficulty score system.
Risk factor | Points allocated |
|---|---|
Unable to lie flat (spinal deformity, asthma, heart failure) | 1 |
Severe anxiety | 1 |
Head tremor | 1 |
Previous angle closure glaucoma | 1 |
History of complication in fellow eye | 1 |
Previous vitrectomy | 1 |
Corneal scarring/cloudiness | 1 |
Shallow anterior chamber | 1 |
Poor pupillary dilation and/or posterior synechiae | 1 |
Pseudoexfoliation | 1 |
Phacodonesis/weak zonules | 1 |
High myopia (axial length >27 mm) | 1 |
High hypermetropia (axial length <20 mm) | 1 |
Nuclear density grade 1–2 | 1 |
Nuclear density grade 3 | 2 |
Mature/brunescent/white/dense/total cataract | 3 |