Which region of eye consists of tough fibrous tissues?
The sclera, also known as the white of the eye, is the opaque, fibrous, protective, outer layer of the human eye containing mainly collagen and some elastic fibre. Whereas choroid is the vascular layer of the eye, and lies between the retina and the sclera. The retina is a layer 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. The retina is composed of light-sensitive neurons arranged in three layers; the first layer is made up of rods and cones and the other two transmit impulses from the rods and cones to the optic nerve. The cornea is the clear front surface of the eye. It lies directly in front of the iris and pupil and allows light to enter the eye.