What is the other name of near-sightedness?

$A$ person needs a lens of power $-5.5$ dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power $+1.5$ dioptre. What is the focal length (in $cm$) of the lens required for correcting distant vision?

The change in focal length of an eye lens is caused by the action of the

$(i)$ Calculate the maximum power of accommodation of a person having normal vision.
$(ii)$ $A$ person needs to use glasses for reading a newspaper. Identify the defect in her vision and the type of lens she would need to correct it.
$(iii)$ Sometimes when we enter a dark room from bright sunlight,we are unable to see objects clearly. Why?

What are hypermetropia and myopia? What are their causes? How are they rectified?

In the eye of a person suffering from myopia (nearsightedness),where is the image of a distant object formed?