Question

Define far point and near point.

Answer 1

Far point :

1. The far point of visual perception is the farthest point from which an object’s image can be projected to the retina within the eye’s accommodation.
2. It’s often referred to as the image’s clearest point away from the eye.
3. The far point of the eye is the maximum distance at which the eye can see the objects clearly. The far point of the normal human eye is infinity.
4. Myopia is a disorder in which the eye is unable to see distant objects properly.
5. Thus for a myopic eye far point is less than infinity.

Near point :

1. The near point is the nearest point within the eye’s accommodation range at which an object can be positioned and still form a focused image on the retina.
2. The near point of the eye is the minimum distance of the object from the eye, which can be seen distinctly without strain.
3. For a normal human eye, this distance is 25 cm (the least distance of distinct vision).
4. Hypermetropia is a condition in which the eye can’t see close objects properly.
5. Thus for a hypermetropic eye, the near point no longer lies at 25 cm but recedes away.