Outcome of the surgical decompression for traumatic optic neuropathy: a systematic review and meta-analysis

There exists a persisting controversy regarding the indications for optic nerve surgical decompression (ONSD) in traumatic optic neuropathy (TON). A meta-analysis is warranted to help guiding therapeutic decisions and address gaps in knowledge. The authors conducted a search of PubMed and MEDLINE electronic databases. Primary endpoint was the improvement in the visual function with ONSD in comparison with the conservative management. Secondary endpoint was visual function improvement when surgery was performed within the first 7 days. A random effects model meta-analysis was conducted. Data from each study were used to generate log odds ratio and 95% confidence intervals, to compare post-operative visual improvement. Nine studies met the inclusion criteria for analysis, comprising 766 patients. Visual improvement occurred in 55% (198/360) of patients treated with ONSD, and in 40% (164/406) of those who underwent conservative treatment. Forest plot revealed significant differences in the visual function improvement among these two groups, although further analysis revealed the studies were heterogeneous (log OR, 0.81; CI, 0.07-1.55; I², 62.8% p = 0.015). Overall, patients who underwent early surgery had better visual outcomes (log OR, 0.94; CI, 0.29-1.60; I², 0% p = 0.9). ONSD is an effective technique to improve the outcome in the visual function in patients with TON. A lack of randomized controlled trial-and inherent surgical selection and publication bias-limits direct comparison between surgical decompression and conservative management. Suitably designed prospective cohort studies may be useful in identifying patients more likely to receive benefit from ONSD.