Answer: It is called Accommodation.
Step-by-step explanation:
Retina is the innermost and sensitive tissues around the eye, it is located near the optic nerve. The function of retina is receive light that lens has focused and convert those light to neural message and send the signals to the brain for interpretation.
Accomodation is the adjustment of objects at varrying distance. When the crystalline lens change shapes, it changes the focal distance of the eye so that object at different distances can be focused on and thus allowing the formation of clear and real image on the retina, this adjustment of lens is called accommodation. The crystalline lens of the eye is located at the iris and it is made up of fibres from the epithelial cells.