In $presbyopia$:

Select the correct option for the mechanism of vision.

The movement of the eyeball is brought about by the:

Why are owls able to see only during the night?

Given below are the two statements regarding photoreceptor cells of the human eye.
Statement $I$: The three types of cone cells have their own characteristic photopigments that respond to red,green,and blue lights.
Statement $II$: Sensation of white light is produced due to simultaneous equal stimulation of all three types of cone cells.
In the light of the above statements,choose the correct answer from the options given below:

Which part of the retina consists of only cones?