Myopie

In myopia, commonly called short-sight or near-sight, rays of light coming from a distance are focused in front of the retina.

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Central Fixation
When the eye looks at objects with central fixation it is at rest, the muscles which control the refraction act normally, and maximum vision is attained.

In the upper picture the sight is centered upon one spot, the upper left-hand corner of the letter R, which is seen more clearly and appears to be blacker than the rest of the field of vision. This is central fixation. In the lower picture the subject is endeavoring to see every part of her field of vision equally well at the same time. This is eccentric fixation and always accompanies eye strain

It is impossible, however, for the eye to look at any point for more than a fraction of a second. If it tries to do so, the point disappears and the whole visual field blurs. Perfect vision is thus seen to depend on clear vision of the smallest possible area and constant movement of the eye from one such area to another.