Accommodation

 

Accommodation to the infinity

Accomodation to a short distance

Accommodation is the focusing adjustment made by the eye to change the shape of its lens (contraction of ciliary muscles => variation of convergence / focal length of the crystalline lens). The amount of muscular change provide distance information for object within 2 or 3 m.

Convergence is the movement of the eyes to bring an object into the same location of the retina of each eyes. The orbital muscle movement used for convergence provide information to the brain on the distance of the object in view.