They are mobile tissue curtains placed in front of both the eyes which acts as shutters protecting the eyes from injuries and helps in spreading tear film all over the eyes. The eyelids are made upof skin and have various glands to produce the tears.

Is a thin semi - transparent layer of tissue that lines the inner surface of the eyelid and covers the white part of the eye.

Is a dense connective tissue of the eyeball that forms the "white" part of the eye.It is a fibrous coat of he eye with many blood vesseles.

The clear fluid filling the space in the Anter Chamber, maintaining eye pressure or the intra ocular pressure (IOP).

It is the aperture which regulates the amount of light to enter the eye.

Is the back two-thirds of the eye that includes all of the optical structures behind it: the vitreous humor, retina, choroid, and optic nerve.

The pigmented vascular layer of the eyeball between the retina and the sclera.

It is a bony cavity which  is a place where the eye, extraocular muscles, nerves, fat, and blood vessels rest.

Is clear liquid secreted by the lacrimal glands which helps in maintaining ocular surface moist and and flush out debris from the eye.

Is the window of the eyes forming the outer protective layer controlling ⅔ of eyes refractive power.The most transparent layer of the eye.

 Is the aqueous humor-filled space inside the eye between the iris and the cornea's innermost layer, the endothelium.

Is a transparent, Biconvex structure in the eye that is suspended immediately behind the iris that brings rays of light to a focus on the retina.

Is the transparent gelatinous tissue filling the eyeball in Posterior segment. It helps the retina to be intact.

each of the second pair of cranial nerves, transmitting impulses to the brain from the retina at the back of the eye.

Are small hair growing at the edge of the eyelids which protects the eye from debris, dust and any foreign body.

Is a tiny opening in both lower and upper eyelids towards medial side at the lid margin which drains the tears in the lacrimal drainage system after each blink.

Is the junction between cornea and sclera.

Is a flat, coloured, ring-shaped membrane behind the cornea in Anterior chamber, with an adjustable circular opening (pupil) in the centre which control the amount of light entering into our eyes. This is the part which gives the eye its color.

Is an aqueous producing tissue behind the iris in the posterior segment.

Is a complex 10 layer structure at the back of the eyeball that contains cells sensitive to light, which trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.