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Your friend tells you that she has just been diagnosed with myopia, and she wonders if staring at her computer screen too much might have caused her problem. What do you tell her?
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15. The Special Senses
The Lens and Focusing Light on the Retina
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What structure changes the shape of the lens to focus light for far and near vision?
A
Cornea
B
Ciliary muscle
C
Retina
D
Iris
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Identify the function of the lens in the eye, which is to focus light onto the retina for clear vision.
Understand that the lens changes shape to adjust focus for objects at different distances, a process known as accommodation.
Recognize that the ciliary muscle is responsible for changing the shape of the lens. When the ciliary muscle contracts, it allows the lens to become more rounded for near vision. When it relaxes, the lens flattens for far vision.
Differentiate the roles of other eye structures: the cornea helps to refract light but does not change shape, the retina is the light-sensitive layer where images are formed, and the iris controls the size of the pupil but does not affect lens shape.
Conclude that the ciliary muscle is the structure that changes the shape of the lens to focus light for both far and near vision.
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