Eyelid and eyelash surface

The eyelid and eyelash surface is a critical anatomical and functional unit of the ocular adnexa, serving as the first line of defense for the eye. It encompasses the palpebral skin, the lid margin, Meibomian gland orifices, and the eyelashes (cilia) [PMID: 30034543]. Biologically, it is responsible for distributing the tear film, secreting the essential lipid layer via Meibomian glands to prevent aqueous evaporation, and providing sensory protection through the blink reflex [PMID: 21461238]. Pathological conditions associated with this surface include blepharitis, Meibomian gland dysfunction (MGD), and Demodex blepharitis, which are major contributors to dry eye disease and ocular surface inflammation [PMID: 37535408, NBK459305]. While several pharmacological agents like lotilaner and various antibiotics are applied to this surface or target pathogens residing there, the 'eyelid and eyelash surface' itself is classified as an anatomical site rather than a specific molecular therapeutic target such as a receptor or enzyme.

Other names

PalpebraCiliaOcular adnexaLid marginEyelid margin

Drugs applied to this surface typically act by eradicating ectoparasites (e.g., lotilaner inhibiting GABA-gated chloride channels in Demodex mites), reducing bacterial load, or suppressing inflammatory cytokines to restore the health of the lid margin and Meibomian glands.