The ocular cellular system consists of the eye and its visual system (cornea, lens and fluids). The function of the ocular system is to transpose light into visual signals. Epithelial cells, keratocytes, fibroblasts and cells of the trabecular meshwork are essential components in the normal functioning of the ocular cellular system. Atypical cell proliferation and regulation within the ocular cellular system contribute to the development of disorders such as corneal inflammation, proliferative retinopathy, macular degeneration, glaucoma and retinoblastoma. The ocular cellular system is made up of a wide variety of cells, including: corneal epithelial cells, keratocytes, retinal pigment epithelial cells, lens epithelial cells, iris pigment epithelial cells, conjunctival fibroblasts, non-pigmented ciliary epithelial cells, trabeculum cells, ocular choroid fibroblasts and conjunctival epithelial cells.