Subtenon injections are an ophthalmic procedure in which a medication is injected into the subtenon space of the eye. This space is located between the conjunctiva, the thin and transparent layer that covers the white part of the eye, and the sclera, the tough white layer that makes up most of the eye’s wall.
The procedure is performed on an outpatient basis under topical anesthesia to minimize patient discomfort. The ophthalmologist disinfects and prepares the area for injection, and with the help of a fine needle, injects the medication through the conjunctiva directly into the subtenon space. This method of administration allows the medication to be absorbed effectively and reach the back of the eye, including the retina and choroid, where the affected areas are located due to inflammation.
The most common medication used in subtenon injections is cortisone, a potent anti-inflammatory that helps reduce edema and inflammation in the eye. In some cases, other medications such as antibiotics or antivirals may also be used, depending on the specific cause of the inflammation.
Conditions Treated with Subtenon Injections
Subtenon injections have become a treatment of choice for various inflammatory eye conditions, such as:
- Macular Edema: Fluid accumulation in the central area of the retina that can cause blurred or distorted vision.
- Diabetic Retinopathy: Damage to the retina caused by diabetes, which can lead to vision loss.
- Posterior Uveitis: Inflammation of the back part of the eye, including the retina, choroid, and optic nerve.
- Other Inflammatory Disorders: Subtenon injections may also be useful for treating other inflammatory eye conditions such as choroidal neovascularization and retinitis.
