1. It is composed of eyeball and its auxiliary structure.
2. The eyeball is the main part of the visual organ, which has two functions: refraction imaging and photosensitive energy conversion.
3. The auxiliary parts of the eye include eyelid, conjunctiva, lacrimal apparatus, eye muscle, orbital fascia and fat, which can protect, move and support the eyeball.
4. The perfection of the structure of each part of the eye is of great significance to the visual function of the eye.
