Szemszövetek

Szemszövetek, or eye tissues, refer to the various biological materials that constitute the structure and function of the eye. These tissues are highly specialized to work together, enabling vision. The outermost layer, the cornea, is a transparent protective covering that also refracts light. Beneath the cornea lies the sclera, the tough, white outer layer that maintains the eye's shape. The uvea, or middle layer, comprises the iris, the colored part of the eye that controls pupil size, the ciliary body, which adjusts the lens for focusing, and the choroid, a vascular layer that nourishes the retina. The innermost layer is the retina, a light-sensitive tissue containing photoreceptor cells (rods and cones) that convert light into electrical signals. These signals are then processed and transmitted to the brain via the optic nerve, another crucial eye tissue. The lens, located behind the iris, is a transparent structure that further focuses light onto the retina. The vitreous humor, a gel-like substance, fills the space between the lens and the retina, helping to maintain the eye's shape. The aqueous humor, a fluid, fills the space between the cornea and the iris, providing nutrients and maintaining intraocular pressure. Each of these szemszövetek plays a vital role in the complex process of sight.