structure of the eye

; Sclera - The sclera is the white, tough, outer covering of globe of the eye. The eyeball is divided into two sections, each of which is filled with fluid. Our eyes might be small, but they provide us with what many people consider to be the most important of our senses – vision. The optic disk, the first part of the optic nerve, is at the back of the eye. The optic nerve is attached to the sclera at the back of the eye. The retina is made up by millions of specialised cells known as rods and cones, which work together to transform the image into electrical energy, which is sent to the optic disk on the retina and transferred via electrical impulses along the optic nerve to be processed by the brain. The high density of cones in the macula makes the visual image detailed, just as a high-resolution digital camera has more megapixels. The front (anterior) chamber extends from the cornea to the iris. We do not control or have responsibility for the content of any third-party site. The sclera is the white part of the eye, its protective outer layer. Cones, on the other hand, function best in bright light. The brain integrates the information to produce a complete picture. The front part is also called the anterior segment of the eye. Rods are grouped mainly in the peripheral areas of the retina. There are 6 sets of muscles attached to outer surface of eye ball which helps to rotate it in different direction. Lens. Last full review/revision Mar 2019| Content last modified Mar 2019, © 2020 Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc., Kenilworth, NJ, USA), © 2021 Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc., Kenilworth, NJ, USA, Cornea (clear layer in front of the iris and pupil). It provides attachment surfaces for eye muscles Choroid Behind the iris sits the lens. The iris controls the size of the pupil, which is … Cones are responsible for sharp, detailed central vision and color vision and are clustered mainly in the macula. This black area is actually a hole that takes in light so the eye … The sclera is outermost layer of the eyeball. The eye has a number of components which include but are not limited to the cornea, iris, pupil, lens, retina, macula, optic nerve, choroid and vitreous. Anatomy of the Eye. These adaptations are regarded as the first evolutionary improvements in… Near the front of the eye, in the area protected by the eyelids, the sclera is covered by a thin, transparent membrane ( conjunctiva ), which runs to the edge of the cornea. This process is the basis of stereo vision or depth perception. Structure and function of eye 1. The front section (anterior segment) extends from the inside of the cornea to the front surface of the lens. The pupil appears as a black dot in the middle of the eye. Other articles where Eye is discussed: amphibian: Common features: The eye of the modern amphibian (or lissamphibian) has a lid, associated glands, and ducts. Cornea: clear front window of the eye that transmits and focuses light into the eye. We shall now look at these layers in further detail. Together with the cornea and aqueous humor, the vitreous body and lens belong to the refractive media of the eyeball. Which of the following eye structures is highly sensitive to pain? Through the action of small muscles (called the ciliary muscles), the lens becomes thicker to focus on nearby objects and thinner to focus on distant objects. It consists of the following parts: Sclera: It is the outer covering, a protective tough white layer called the sclera (white part of the eye). The eyeball can be divided into the fibrous, vascular and inner layers. Eye pain may be severe and sharp, aching, or throbbing. The sclera is the outermost layer of tissue, also called the white of the eye. 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