See: adaptation The automatic process by which the eyes adjust their focus when the gaze is shifted from one point to another at a different distance.Accommodation is achieved by changing the degree of curvature of the internal crystalline lenses of the eyes. Fringe ophthalmology Near and far focusing—an exercise in Bates vision training, which consists of changing the point of focus from near to far distances multiple times.

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In youth, these are naturally elastic and become more curved when the pull on the ligament by which they are suspended is reduced by contraction of the surrounding muscle ring (CILIARY MUSCLE). The elasticity of the lenses drops progressively with age so the power of accommodation lessens.

In middle age PRESBYOPIA becomes apparent in all but the near-sighted. It is generally involuntary and made to see objects clearly at any distance.

In man (and primates), this adjustment is brought about by a change in the shape of the crystalline lens.

In some animals this adjustment occurs either as a result of an anteroposterior movement of the crystalline lens, or of an alteration in the curvature of the cornea.

[1913 Webster] Syn: To suit; adapt; conform; adjust; arrange.