Eyeball, spheroidal structure containing sense receptors for vision, found in all vertebrates and constructed much like a simple camera. The eyeball houses the retina—an extremely metabolically active layer of nerve tissue made up of millions of light receptors (photoreceptors)—and all of the.

Humans have two eyes, situated on the left and the right of the face. The eyes sit in bony cavities called the orbits, in the skull. There are six extraocular muscles that control eye movements. The front visible part of the eye is made up of the whitish sclera, a coloured iris, and the pupil.

2024年11月23日 · Here are all the possible answers for Eyeballs crossword clue which contains 5 Letters. This clue was last spotted on November 23 2024 in the popular Thomas Joseph Crossword puzzle.

2023年11月3日 · These remarkable features of our eye are enabled by the complex structure of the eyeball. The eyeball consists of three layers; fibrous, vascular and nervous (retina). Functionally, the most important layer is the retina, which receives the external visual stimuli.

2021年3月20日 · The eyeball is a bilateral and spherical organ, which houses the structures responsible for vision. It lies in a bony cavity within the facial skeleton – known as the bony orbit. Anatomically, the eyeball can be divided into three parts – the fibrous, vascular and inner layers.

Eye of a European bison Human eye. Complex eyes distinguish shapes and colours.The visual fields of many organisms, especially predators, involve large areas of binocular vision for depth perception.In other organisms, particularly prey animals, eyes are located to maximise the field of view, such as in rabbits and horses, which have monocular vision.. The first proto-eyes …

2024年12月16日 · The eyeball and its functional muscles are 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.

2025年1月22日 · It is composed of several layers, including the sclera, cornea, choroid, retina, and vitreous body. The eyeball houses key components such as the lens, iris, and optic nerve, which work together to focus light, process visual information, and send it …

There are four main muscles arranged at the cardinal points around the eye called superior rectus, medial rectus, inferior rectus, and lateral rectus. Contraction of one of these muscles results in the eye moving toward the contracting muscle.

The meaning of EYEBALL is the more or less globular capsule of the vertebrate eye formed by the sclera and cornea together with their contained structures. How to use eyeball in a sentence.