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

An eye has a far point of 2 m. What type of lens in spectacles would be needed to increase the far point to infinity? Also calculate the power of lens required. Is this eye long-sighted or short-sighted?

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

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 :

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: