Which part of eye gives colour to eye?

Name the part of the eye which gives colour to the eyes.

Which part of eye is equivalent to diaphragm?

Which part of human eye is devoid of blood vessels?

Which part of human eye is most sensitive to bright light?

Which part of the human eye is located just behind the pupil ?

Which part of the eye controls the amount of light entering in it or The black pigment in the eye which reduces the internal reflection is located in

Which part of the eye cotains cells which are sensitive to light ?