Define each of the following terms.

1. emmetropic

2. astigmatism

3. hyperopic

4. myopic

5. poerbyopia

6. visual acuity

7. refractions

8. accommodation

B. Short-Answer Questions

1. Explain the difference between viewing a discount object and viewing one close to the eye.

2. How is the snellen eye chart used to measure visual acuity?

3. Describe how the lens changes shape to view a close object.