Corneal stromal collagen

The corneal stroma constitutes approximately 90% of the total corneal thickness and is primarily composed of a highly ordered arrangement of Type I and Type V collagen fibrils (StatPearls: Anatomy, Airway, Cornea). These fibrils are organized into approximately 200 to 250 lamellae that run parallel to the corneal surface, a configuration essential for maintaining both mechanical strength and optical transparency (NIH: Corneal Structure and Function). In pathological conditions such as keratoconus or corneal ectasia, the structural integrity of this collagenous matrix is weakened, leading to progressive thinning and visual distortion (Mayo Clinic: Keratoconus). Therapeutic interventions like corneal collagen cross-linking (CXL) specifically target these stromal fibers; by applying a photosensitizer like riboflavin followed by UV-A irradiation, new covalent bonds are formed between collagen molecules (AAO: Corneal Collagen Cross-linking). This biochemical modification increases the rigidity of the stroma and halts the progression of ectatic diseases. Additionally, the corneal stromal collagen serves as a scaffold for regenerative therapies and is a critical factor in the corneal wound healing response following refractive surgery or injury (PubMed: Collagen types in the human corneal stroma).

Other names

Corneal collagenStromal collagenType I/V corneal collagen

Induction of inter- and intra-fibrillar covalent cross-links through photo-oxidation (typically using Riboflavin and UV-A light) to increase the biomechanical stiffness and enzymatic resistance of the corneal stroma.