In a process called accommodation, the lens thins or thickens to focus the incoming light so that the light falls on the retina.

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Accommodation is the process by which the lens changes shape to adjust the focal length and focus the incoming light on the retina. When focusing on distant objects, the lens becomes flatter and thinner; while when focusing on near objects, the lens becomes rounder and thicker.

In a Process Called Accommodation, the Lens Thins or Thickens