subtenon

Subtenon refers to the potential space between Tenon's capsule and the sclera of the eye. Tenon's capsule is a thin fascial sheath that encloses the eyeball, from the optic nerve to the limbus. The subtenon space is a potential space, meaning it is not typically occupied by significant tissue but can be accessed for certain medical procedures.

This anatomical space is important because it allows for the distribution of injected medications around the eye, particularly in the management of various ocular conditions. Subtenon injections are a common method for delivering anesthetics, anti-inflammatory drugs, or other therapeutic agents directly to the posterior segment of the eye. The location of the subtenon space allows for a slower release of medication compared to intravitreal injections, potentially reducing the frequency of administration and systemic side effects.

The procedure involves inserting a needle into the subtenon space, usually through the conjunctiva, to deposit the medication. While generally considered safe, potential complications can include subconjunctival hemorrhage, temporary increased intraocular pressure, or, rarely, damage to ocular structures. An understanding of the subtenon space is crucial for ophthalmologists performing these injections to ensure accurate placement and minimize risks.