The nurse is examining the eye. The client asks about the ...

[altibaby]

The nurse is examining the eye. The client asks about the specific structures within the eye that are responsible for refraction of light rays. Which structures are involved in this process? Select all that apply.
 
  1. Lens.
  2. Macula.
  3. Cornea.
  4. Iris.
  5. Optic disc.
  Correct Answer: 1, 3

Question 2

The nurse notes that a client is unable to control the amount of light that enters the eye. The dysfunction of which structure is the most likely cause of this problem?
 
  1. Cornea.
  2. Sclera.
  3. Conjunctiva.
  4. Iris.

[joshbk44]

Answer to Question 1

Correct Answer: 1, 3

The lens is located directly behind the pupil and is used to refract light through the eye. The cornea is a transparent part of the eye and located anteriorly. It allows light to enter the eye and assists with refraction. The macula is located within the retina and does not assist with light refraction. The iris controls the amount of light that enters the eye, but is not associated with refraction. The optic disc is where the optic nerve and retina meet. It is where the vascular network enters the eye. This structure is not associated with refraction.

Answer to Question 2

Correct Answer: 4
The iris responds to the light coming through the cornea by making the pupil larger or smaller, thereby controlling the amount of light that enters the eye. The cornea is the window of the eye. It is the clear, transparent part of the sclera and forms the anterior one sixth of the eye. The sclera supports and protects the structures of the eye. The conjunctiva protects the eye and produces a lubricating fluid that prevents the eye from becoming too dry.