Defects of Vision and their Correction

The image formation in human eye is shown in the given diagram.

The lens used to correct this type of eye defect is:

A person cannot see the object beyond $50 \mathrm{cm}$. The power of lens to correct this defect will be

Sheela cannot read newspaper when she holds it closer than $100 \mathrm{cm}.$ The defect in her eye and the power of lens prescribed to her [Normal eye near point $=$ $25 \mathrm{cm}$]

Hypermetropia and myopia are the most common defects of vision affecting humans. Both these defects can be corrected and perfect vision can be restored with the use of suitable lenses of appropriate focal lengths. Hypermetropia can be corrected by using convex lenses while myopia can be corrected by using concave lenses. The power of prescribed lens for both these defects depends on the focal length of the respective corrective lens. The power, $P$ of the lens is given by
$P=\frac{1}{f(in \mathrm{metres})} \mathrm{dioptres}$

A person can see clearly up to $3 \mathrm{m}$. What should be the power of the lens in his spectacles so that he could see clearly up to $12 \mathrm{m}$?

Hypermetropia and myopia are the most common defects of vision affecting humans. Both these defects can be corrected and perfect vision can be restored with the use of suitable lenses of appropriate focal lengths. Hypermetropia can be corrected by using convex lenses while myopia can be corrected by using concave lenses. The power of prescribed lens for both these defects depends on the focal length of the respective corrective lens. The power, $P$ of the lens is given by
$P=\frac{1}{f(in \mathrm{metres})} \mathrm{dioptres}$
Now, consider a situation in which the near point of a defective eye is at a distance of $1.0 \mathrm{m}$. Assuming the near point of a normal eye to be $25 \mathrm{cm}$, answer the following question:

What should be the power of the corrective lens?

Hypermetropia and myopia are the most common defects of vision affecting humans. Both these defects can be corrected and perfect vision can be restored with the use of suitable lenses of appropriate focal lengths. Hypermetropia can be corrected by using convex lenses while myopia can be corrected by using concave lenses. The power of prescribed lens for both these defects depends on the focal length of the respective corrective lens. The power, $P$ of the lens is given by
$P=\frac{1}{f(in \mathrm{metres})} \mathrm{dioptres}$
Now, consider a situation in which the near point of a defective eye is at a distance of $1.0 \mathrm{m}$. Assuming the near point of a normal eye to be $25 \mathrm{cm}$, answer the following question:

What type of lens should be used to correct the vision?

A person, have hypermetropia

To remove long sightedness, the lens is used

Myopia is also known as ______.