Hypermetropia can be corrected by using a convex lens of appropriate power. Eye-glasses with converging lenses provide the additional focusing power required to form the image on the retina.

Hypermetropia can arise either because (i) the focal length of the eye lens is too long or (ii) the eyeball has become too small.

For a person with hypermetropia, the near point is farther away from the normal near point (25 cm). Reading material must be kept much beyond 25 cm for comfortable reading.

Hypermetropia, also known as far-sightedness, is a refractive defect where a person can see distant objects clearly but cannot see nearby objects distinctly.

In a myopic eye, the image of a distant object is formed in front of the retina, not directly on the retina itself. This defect can arise due to (i) excessive curvature of the eye lens or (ii) elongation of ...

A person with myopia has the far point nearer than infinity, allowing them to see clearly up to a distance of a few meters. However, distant objects appear blurry.

Myopia, also known as nearsightedness, is a refractive defect where a person can see nearby objects clearly but cannot see distant objects distinctly.

The three common refractive defects of vision mentioned are (i) myopia or near-sightedness, (ii) hypermetropia or farsightedness, and (iii) presbyopia.

When the eye gradually loses its power of accommodation, a person cannot see objects distinctly and comfortably, leading to blurred vision. This is due to refractive defects of the eye.

Cataract is a condition where the crystalline lens becomes milky and cloudy, causing partial or complete loss of vision. Vision can be restored through cataract surgery, a medical procedure that replaces the cloudy lens with an artificial one.