Iris (anatomy) surface projects as the dilator muscles. The high pigment content blocks light from passing through the iris to the retina, restricting it to the pupil. The outer edge of the iris, known as the root, is attached to the sclera and the anterior ciliary body. The iris and ciliary body together are known as the anterior uvea. Just in front of the root of the iris is the region referred to as the trabecular meshwork, through which the aqueous humour constantly drains out of the eye, with the result that diseases of the iris often have important effects on intraocular
Ocelloid hypothesized to represent the eye of a multicellular organism coincidentally engulfed by a single-celled organism. The possibility that it had an evolutionary relationship to plastids had been considered at least since the 1970s, although until the 2010s direct evidence was scarce. Ocelloids contain subcomponents analogous to eye structures including the lens, cornea, iris, and retina. It can be divided into two substructures, the translucent, roundish "hyalosome" and the heavily pigmented "melanosome", also known as the retinal body or pigment cup. The hyalosome serves as the refractive lens of the ocelloid; it is surrounded by a layer of mitochondria serving as