The eye's lens changes its physical shape to shift focus between objects
The lens of the human eye is a dynamic structure that physically changes its shape in milliseconds to shift focus from a distant horizon to a handheld book.
To focus on near objects, the ciliary muscles in the eye contract, causing the suspensory ligaments to slacken and the 4mm-thick crystalline lens to bulge outward by about 0.4mm. This increase in curvature, known as accommodation, adds up to 10 diopters of refractive power to the eye.
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