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 its shape to adjust the focus of incoming light so that it hits the retina. This is achieved by the lens becoming thicker to focus on nearby objects and thinner to focus on distant objects.

In a Process Called Accommodation, the Lens Thins or Thickens