Eye surgery

How to – Subconjunctival injection

Indications

Subconjunctival injections are used to provide ongoing medication to a patient that will not tolerate digital application of ointments or instillation of drops and is also not a candidate for various flush systems. This is typically cattle. The most common condition treated is pinkeye.

Antibiotics (or steroids) are injected under the conjunctiva of the upper globe. The drug will leak out slowly over time, bathing the cornea.

Method

Use a 25 or smaller gauge needle and a 3 cc syringe. Generally 1 ml of medication is used.

Provide topical anesthesia and palpebral block if indicated.

With the bevel up, insert the needle subconjunctivally until the bevel is fully covered. Inject slowly.

Videos

He is injecting into the palpebral conjunctiva. Starts at the 7min mark.

Resources

Pinkeye problems in cows, CSU extension

License

Icon for the Creative Commons Attribution-NonCommercial 4.0 International License

Large Animal Surgery - Supplemental Notes by Erin Malone, DVM, PhD; Elaine Norton, DVM PhD; Erica Dobbs, DVM; and Ashley Ezzo, DVM is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, except where otherwise noted.