Which of the following are functions of the cone cells of the retina?
$1.$ Photopic vision
$2.$ Colour vision
$3.$ Scotopic vision

The defective condition of accommodation of the eye in which distant objects are seen distinctly but near objects are indistinct is:

When the intensity of light is low during the night,the light is detected by:

Which cells of the retina enable us to see coloured objects around us?

Which of the following statements is correct regarding the pupil of the human eye?
$(I)$. It is the aperture surrounded by the iris.
$(II)$. The diameter of the pupil is regulated by the muscle fibres of the iris.
$(III)$. It is a transparent crystalline structure attached to the ciliary body.
The correct option is:

Through which of the following does the optic nerve enter the eyeball?