Accommodation is an important step in vision. Distance accommodation is the distance adjustment of the eye. Whereas with near accommodation, the visual organ switches from distance to near vision. Often, accommodation is understood to mean only near adaptation.
The lens in the eye is elastic and convexly curved on its front and rear. This creates a converging lens that focuses the incident light. In this way, a sharp image is created on the retina.
A highly curved lens refracts the light more strongly and enables us to focus on nearby objects (near accommodation). A flat lens on the other hand makes objects at a greater distance appear sharp on the retina (distance accommodation).