Eyes are the organ of vision which collects light and convert it into electro chemical signals and send it to neurons.
The front part of the eye includes iris, pupil, sclera, cornea and conjunctiva. The lens is present behind the pupil and iris that focus the light on the back of the eye. Lenses are held in position by ciliary muscles. These muscles help in changing the lens curvature to see nearby and far object clearly by contraction and relaxation of the ciliary muscles. The eye contains light sensitive cells called retina. The light sensitive cells are called rods and cones. It is the retina that converts the light into electrical signals. Eye color depends on the amount and the type of pigment in the iris. The eye is divided into two parts. The anterior part extends from inside of the cornea to lens. This part is filled with fluid called aqueous humor. The posterior part that extends from the lens to the retina, it is filled with vitreous humor. The pressure generated by these fluids helps to maintain the shape of the eye ball.
Last date updated on September, 2014