$A$ defective eye cannot see close objects clearly because their image is formed

$A$ man can see up to $100 \, cm$ of the distant object. The power of the lens required to see far objects will be

$A$ person has a near point of $50 \, cm$ and a far point of $3 \, m$. What power of lens is required to $(i)$ read and $(ii)$ see distant stars?

When the power of the eye lens increases,a defect of vision is produced. This defect is known as:

Your friend is having an eyesight problem. She is not able to see a distant uniform window mesh clearly,and it appears to her as non-uniform and distorted. The doctor diagnosed the problem as:

$A$ presbyopic patient has a near point of $30 \ cm$ and a far point of $40 \ cm$. The dioptric power of the corrective lens required for seeing distant objects is: (in $D$)