Table 2. Limitations and relative contraindications of sub-Tenon's block (modified from Kumar and Dodds)30.
| Limitations |
| Previous sub-Tenon's block in the same quadrant |
| Previous extensive vitreo-retinal surgery |
| Previous repeated strabismus surgery |
| Eye trauma |
| Infection to the orbit |
| Relative contraindications |
| Severe ocular pemphigoid |
| Surgery requiring complete akinesia (viscacanalstomy) |
| Surgery where chemosis and subconjunctival haemorrhage may compromise the outcome of surgery (glaucoma filtration surgery) |