| Level I | Good quality evidence |
Systematic review of RCTs with consistent findings High quality individual RCT |
| Level II |
Limited quality patient orientated evidence |
Systematic review of lower quality studies or studies with inconsistent findings Low quality clinical trial Cohort studies Case-control studies |
| Level III | Other |
Consensus guidelines, extrapolations from bench research, usual practice, opinion, disease-oriented evidence (intermediate or physiologic outcomes only), or case series |
[3] Ceftazidime, intravitreal: Yonekawa Y, Chan RV, Reddy AK, Pieroni CG, Lee TC, Lee S. Early intravitreal
treatment of endogenous bacterial endophthalmitis. Clin Experiment Ophthalmol.2011 Nov;39(8):771-8. http://www.ncbi.nlm.nih.gov/pubmed/22050564
Ceftazidime, intravitreal: Okada AA, John RP, Liles WC, D'Amico DJ, Baker AS. Endogenous bacterial endophthalmitis. Report of a ten-year retrospective study 1994;101(5):832-838. http://www.ncbi.nlm.nih.gov/pubmed/8190467