Sub-Tenon injection

Sub-Tenon injection is an ocular route of drug administration. It involves administration of a medication to the area between the sclera and the Tenon's capsule.^[1]

Sagittal section of the human eye showing the Tenon's capsule, labelled Fascia bulbi

Posterior sub-Tenons steroid injections (PSTSI) is used in the treatment of posterior ocular inflammation, such as chronic uveitis.^[2] This route is also reported to be used to administer triamcinolone acetonide (a corticosteroid) in the treatment of macular telangiectasia type 1.

Also, it is used in the ocular anesthesia.^[3]

References

1. Calenda, Emile; Olle, Priscille; Muraine, Marc; Brasseur, Gérard (2000). "Peribulbar anesthesia and sub‐Tenon injection for vitreoretinal surgery: 300 cases". Acta Ophthalmologica Scandinavica. 78 (2): 196–199. doi:10.1034/j.1600-0420.2000.078002196.x. PMID 10794256.
2. Lafranco Dafflon, M.; Tran, V. T.; Guex-Crosier, Y.; Herbort, C. P. (1999). "Posterior sub-Tenon's steroid injections for the treatment of posterior ocular inflammation: Indications, efficacy and side effects". Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht von Graefes Archiv für Klinische und Experimentelle Ophthalmologie. 237 (4): 289–295. doi:10.1007/s004170050235. PMID 10208261. S2CID 23298901.
3. Sub-Tenon anaesthesia, Eye Wiki.