Ocular mucin layer

The **ocular mucin layer** is the innermost component of the trilaminar tear film (composed of lipid, aqueous, and mucin layers), lining the corneal and conjunctival surfaces. It is primarily composed of high-molecular-weight glycoproteins known as mucins, produced by goblet cells (secreted mucins such as MUC5AC) and epithelial cells (membrane-associated mucins, such as MUC1, MUC4, and MUC16). This layer makes the ocular surface hydrophilic, allows even spreading of the aqueous layer, lubricates the lid–cornea interface during blinking, serves as a physical and biochemical barrier to pathogens, and participates in ocular surface homeostasis and wound healing. Deficiency or dysfunction of the mucin layer contributes to dry eye disease, impaired vision, and increased risk of ocular infection[1][2][3][4][5][6]. Notes: - This entry is not a canonical therapeutic target (e.g., a receptor, enzyme, or specific molecule), but a physiological structure composed of several mucin proteins, and as such does not have a commonly used abbreviation or a precise molecular classification. Accordingly, **is_incorrect** is set to true. - If you seek information about specific mucin targets (e.g., MUC5AC, MUC1, MUC4, etc.), those should be queried individually as each is a gene/protein product that can be specifically classified and may be a drug target[1][2][3][5].

Other names

Tear film mucin layerTear mucus layerOcular mucus layerTear mucin

Increase mucin secretion or production (secretagogues); Stabilize tear film or supplement mucin layer (artificial tears); Reduce ocular surface inflammation to preserve mucin-producing cells (immunomodulators)