The image formed on the retina of the eye is proportional to:

The sensation of vision in the retina is carried to the brain by

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

The diameter of the eye-ball of a normal eye is about $2.5\, cm$. The power of the eye lens varies from

$A$ myopic adult has a far point at $0.1\, m$. His power of accommodation is $4\, D$.
$(i)$ What power lenses are required to see distant objects?
$(ii)$ What is his near point without glasses?
$(iii)$ What is his near point with glasses? (Take the image distance from the lens of the eye to the retina to be $2\, cm$.)

The near point and far point of a normal human eye are respectively: