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Smooth muscle accommodation keeps objects clear across varying distances. The figure is taken from MedlinePlus, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Ciliary muscles alter lens shape instantaneously to focus

Smooth muscle accommodation keeps objects clear across varying distances

To adjust focus between distant scenery and nearby text, ciliary muscles surrounding the eye lens contract or relax in milliseconds. This process, called accommodation, dynamically alters lens curvature to refract incoming light rays precisely onto the retina.

Where this comes from

MedlinePlus

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Tags: eyes, focus, vision

Ciliary muscles alter lens shape instantaneously to focus: the short answers

Where does this come from, and can I check it?: Smooth muscle accommodation keeps objects clear across varying distances. The figure is taken from MedlinePlus, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a human body fact?: Yes. It sits on the Human Body shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.