Accommodation
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Accommodation is how an eye focuses using its lens. It happens using zonules and ciliary muscles.
An eye accommodates to see things close up, where the incoming rays are not parallel. When it does this, the lens thickens in depth and increases its curvature y being pulled by the zonules.
Accommodation has a latency of about 350 - 400 milliseconds (.35 to .4 seconds) after an initial visual stimulus.[1]