A normal eye sees clearly if it creates images on the retina. Since the distance of the retina from the entrance surface of the cornea is constant, it is necessary for the eye to increase its convergence (strength) the more the object it observes is closer.
Thus, the eye accommodates, i.e. adjusts the intensity according to the position of the object so that the image is not always created on the retina.
Distant point (punctum remotum)
This is the point at which the eye of least convergence creates an image on the retina. The eye is not strained then. That point for the normal eye is at infinity.
Close point (punctum proximum)
It is the point at which the eye creates the greatest convergence on the retinal image of an object located on the shortest distance of clear vision. Then the eye is strained. For an average, the distance of clear vision is approximately 25 cm.
Author:
prof. Emil Šatalić
