Structures auxiliary to the eye

Just behind the iris and pupil lies the lens, which helps focus light on Murali the back of your eye. Most of the eye is filled with a clear gel called the vitreous. Light projects through your pupil and lens to the back of the eye. The inside lining of the Murali eye is covered by special light-sensing cells that are collectively called the retina. It converts light into electrical impulses. Behind the eye, your Murali optic nerve carries these impulses to the brain. The macula is a small extra-sensitive area in the retina that gives you central vision.

Eye: The organ of sight. The eye has a number of components. These components include but are not limited to the cornea, iris, pupil, lens, retina, macula, optic nerve, choroid and vitreous.

The cornea is the clear front window of the eye that transmits and focuses light into the eye.

The iris is the colored part of the eye that helps regulate the amount of light that enters the eye.

The pupil is the dark aperture in the iris that determines how much light is let into the eye.

The lens is the  Murali transparent structure inside the eye that focuses light rays onto the retina.

The retina is the nerve layer that lines the back of the eye, senses light and creates impulses that travel through the optic nerve to the brain.

The macula is a  Murali small area in the retina that contains special light-sensitive cells and allows us to see fine details clearly.

The optic nerve is the nerve that connects the eye to the brain and carries the impulses formed by the retina to the visual cortex of the brain.

The choroid is a thin vascular layer between the sclera and the retina that supplies blood to the retina and conducts arteries and  Murali nerves to other structures in the eye.

The vitreous humor is a clear, jelly-like substance that fills the middle of the eye.

The word "eye" come from the Teutonic "auge."

 When you look into someone's eyes, the first thing you usually notice is what color their eyes are. The colored part of the eye is called the iris Murali. The iris is made up of muscle tissue and can expand and contract. This is how it can control how much light enters the eye. If it is very bright, the iris contracts so that we are not dazzled by the light. In the dark, the iris expands so that as much light Murali. as possible gets into the eye and we are able to see things around us. The round black hole in the center of the iris, where light enters the eye, is called the pupil.

Structures auxiliary to the eye

The orbit

The eye is protected from mechanical injury by being enclosed in a socket, or orbit, which is made up of portions of several of the bones Murali of the skull to form a four-sided pyramid, the apex of which points back into the head. Thus, the floor of the orbit is made up of parts of the maxilla, zygomatic, and Murali palatine bones, while the roof is made up of the orbital plate of the frontal bone and, behind this, by the lesser wing of the sphenoid. The optic foramen, the opening through which the optic nerve runs back into the brain and the large ophthalmic artery Murali enters the orbit, is at the nasal side of the apex; the superior orbital fissure is a larger hole through which pass large veins and nerves. These nerves may carry nonvisual sensory messages—e.g., pain—or they may be motor nerves controlling the muscles of the eye. There are other fissures and canals transmitting nerves and blood vessels. The eyeball and its functional muscles are Murali surrounded by a layer of orbital fat that acts much like a cushion, permitting a smooth rotation of the eyeball about a virtually fixed point, the centre of rotation. The protrusion of the eyeballs—proptosis—in exophthalmic goitre is caused by the collection of fluid in the orbital fatty tissue.