Vision is a complex process. The human eye has many structures that contribute to vision. Which of the following statements describing the structures involved in the process of vision is NOT correct?

Select one:

a. Lenses move forward or backward to control the amount of light striking the retina.

b. Ciliary muscles change the shape of the lens to focus both near and distant objects.

c. The iris relaxes and contracts to protect the retina from excess light.

d. The cornea and lens bend light to focus the image on the retina.

2 years ago

Answered By Janna W

Firstly, A is incorrect. The lens inside the eye does NOT move forward or backwards, it actually changes shape thanks to the ciliary muscles (as stated in B). 

 

The iris muscles control the size of the pupil, depending on lighting conditions (stated in C). The main refractive power in the eye comes from the cornea and the lens, which allows light to be focused onto the retina.

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