A person cannot see the distant objects clearly (though he can see the nearby objects clearly). He is suffering from the defect of vision called :

The human eye can focus objects at different distances by adjusting the focal length of the eye-lens. This is due to:

The defect of vision which cannot be corrected by using spectacles is :

Though a woman can see the distant objects clearly, she cannot see the nearby objects clearly. She is suffering from the defect of vision called:

A young man has to hold a book at arm's length to be able to read it clearly. The defect of vision is: