Intravitreal Injection

The medication is placed directly into the vitreous cavity, positioning it close to the retina and other posterior eye structures. This route helps drugs reach therapeutic concentrations within affected ocular tissues while limiting the amount distributed throughout the body. That balance is particularly relevant when treatment must act inside the eye rather than systemically.

The vitreous cavity is the gel-filled space behind the lens and in front of the retina. Delivering medication into this space creates a local reservoir from which the drug can reach nearby posterior structures. This anatomical route supports treatment of retinal disease and helps explain why intravitreal therapy is central to modern retinal care.

The approach can deliver anti-vascular endothelial growth factor agents, corticosteroids, or antibiotics. These categories support different clinical purposes, including treatment of retinal disease, inflammation, and selected infections. Choosing among them determines the type of therapeutic action introduced into the vitreous cavity and connects the procedure to the underlying ocular condition being managed.

The procedure begins with topical anesthesia to reduce discomfort, followed by antiseptic preparation of the eye. A fine needle then passes through the sclera into the vitreous cavity, where medication is delivered. These steps combine local comfort measures, surface preparation, and precise access to the intended intraocular space.

Clinicians use this treatment route for neovascular age-related macular degeneration, diabetic macular edema, retinal vein occlusion, ocular inflammation, and selected infections. Its value is greatest when disease affects the retina or other posterior structures and medication must reach those tissues at therapeutic concentrations rather than relying primarily on systemic distribution.

Intravitreal injection places medication where retinal disease is located, allowing therapeutic concentrations to reach ocular tissues in the posterior eye. At the same time, the route limits systemic exposure compared with delivering the drug throughout the body. This combination makes it an important treatment approach across several retinal, inflammatory, and infectious conditions.