What is the eye lens made of?

$A$ person cannot see objects distinctly when placed beyond $2\, m$.
$(a)$ Identify the eye defect.
$(b)$ Give two reasons for this defect.
$(c)$ Calculate the power and nature of the lens he should be using to see the distant objects clearly.
$(d)$ Draw the ray diagrams for the defective and the corrected eye.

Draw a neat labelled diagram of the structure of the human eye and mention the functions of any four parts.

What is the far point of a person with normal vision?

What is meant by the near point of the eye?

What is the function of the choroid?