The Terminology of Vision

To understand and describe vision, you must be able to use the vocabulary effectively.

Match the words in the left column to the appropriate blanks in the sentences on the right. Note that some terms will remain unused.

cone

retina

iodopsin

cornea

rhodopsin

retinoids

retinal

bleaching

rod

1. Light first enters the eye through the ---------------------- .

2. The --------------------- is the light absorbing layer of the eye that contains the rod and cone cells.

3. A cell in the retina that is responsible for black and white vision, as well as night vision is a--------------------- .

4. A --------------- is a cell in the retina responsible for color vision.

5. ------------------- is a protein found in rods; it is needed for night vision.

6. One type of preformed vitamin A,------------------ , can be converted from retinol.

7. The name for the family of substances that are all types of preformed vitamin A is----------------------- .

8. The process called ------------------------ occurs when light enters the eye and interacts with and changes rhodopsin, causing dissociation of vitamin A from rhodopsin.