Eye structure
The eye consists of eyeball, ocular adnexa and optic nerve. The eyeball includes extraocular muscles, sclera, cornea, iris, lens, vitreous body, retina and other parts.
Eyeball structure
The eyeball consists of three layers: the outer layer is sclera, the middle layer is choroid and iris, and the inner layer is retina. Among them, the retina is the innermost layer of the eyeball, and it is a collection of photosensitive cells, which is responsible for receiving light stimuli and transmitting them to the brain.
Accessory organs of the eye
Eye appendages include eyelids, lacrimal apparatus and extraocular muscles. Eyelid is an important part to protect the eyeball, lacrimal apparatus is responsible for secreting tears, and extraocular muscles control the movement of the eyeball.
Visual function of eyeball
The visual function of eyeball is accomplished by eyeball itself and optic nerve. The eyeball focuses light through the lens, the retina receives light stimulation and transmits it to the brain, and the optic nerve is responsible for transmitting information to the cerebral cortex for processing.
The visual angle of eyeball
The visual angles of eyeball include frontal, frontal and side view. Government vision refers to the eyes looking down, head-up refers to the eyes looking forward and side-looking refers to the eyes looking sideways.