Chickens can see only in bright light. What type of cells is present in their retina?

What is the near point of a normal human eye (in $cm$)?

Draw ray diagrams each showing $(i)$ myopic eye and $(ii)$ hypermetropic eye.

How can a change in the size of the eyeball be a reason for $(a)$ Myopia and $(b)$ Hypermetropia? Compare the size of the eyeball with that of a normal eye in each case. How does this change in size affect the position of the image in each case?

Which part of the eye controls the amount of light entering it?

Name the essential parts of the human eye.