Ocular surface glycocalyx and tear film matrix

The ocular surface glycocalyx and tear film matrix represent a sophisticated physiological system that maintains the health, lubrication, and optical properties of the cornea and conjunctiva (Gipson, 2004; PMID: 14976111). The glycocalyx is a dense network of membrane-associated mucins, primarily MUC1, MUC4, and MUC16, and glycoproteins that extend from the apical surface of the ocular epithelium, creating a hydrophilic environment that facilitates tear film adherence (Mantelli & Argüeso, 2008; PMID: 18772664). The tear film matrix itself is a complex mucoaqueous gel topped by a thin lipid layer, which serves to reduce surface tension, prevent evaporation, and provide a smooth refractive surface for vision (Craig et al., 2017; PMID: 28736335). In pathological states such as dry eye disease (DED) or Sjögren's syndrome, the integrity of this system is compromised, leading to increased friction, inflammation, and potential damage to the underlying epithelium (Pflugfelder & Paiva, 2017; PMID: 28736336). Therapeutic interventions target this system through various mechanisms, including the use of secretagogues like diquafosol to increase mucin and aqueous production, or lipid-based lubricants to stabilize the tear film (Tsubota et al., 2017; PMID: 28736341). Maintaining the homeostasis of the glycocalyx and tear film is essential for protecting the eye from environmental pathogens and ensuring visual acuity.

Other names

Pre-ocular tear filmCorneal glycocalyxMucoaqueous layerTear film lipid layerOcular surface mucin layer

Stimulation of mucin secretion, stabilization of the tear film lipid layer, and restoration of ocular surface hydration and lubrication.