The cornea, sclera, pupil, iris and conjunctiva glands are some of the parts of the human eye. Other parts include the lacrima glands, lens, retina and ciliary body.
The cornea is shaped like a dome and is what covers the eye on the outside. It protects the eye from things that could damage the inner parts. In addition to these functions, it enables the eye to focus on light effectively. The sclera is a layer that is white and smooth on the outer part, while the inner part is brown and has grooves that ensure the proper attachment of the eye's tendons. The pupil is a black dot that people see in the middle of the eye. The black part is a hole that brings light to the eye so that it can focus on different objects in its way. The iris is the part of the eye that surrounds the pupil and has a pigment that gives the eye color. To close or widen the pupil, the iris uses the dilator pupillae muscles.
The eyes are always moist, and the conjunctiva glands make that possible. Being moist prevents the eye from becoming painful and itchy. Lacrimal glands are on the outer corner of every eye. They help in the production of tears. Tears make the eye moist and help get rid of particles that irritate the eye.
The lens is behind the pupil and is a layer that focuses the light received by the pupil. The ciliary muscles hold it in place. The retina is at the back of the eye, and it consists of cones and rods arranged in layers. The layers turn light into electrical pulses and chemicals. The ciliary body has the shape of a ring, and it controls and holds the movement of the lens.