SIGHT

The accomodation - far vision (disaccomodation).
The visual accommodation enables to send a clear image to the retina, either in far or near vision.
It is done by deformation of the eye lens, elastic lens. The ciliary muscles (Muller-Rouget muscle, in yellow, and Brucke muscle, in red) contract or relax, generating or not a traction of the zonula (or zonule of Zinn, the suspensory ligament of the lens). The eye lens is then flattened or bulged.
To switch in far vision, the Muller-Rouget muscle expands whereas the Brucke muscle contracts, causing the tension of the zonula. The eye lens flattens.

See. images 0351807 for the accommodation, 0351607 for the anatomy.