Hands-on Activity Peripheral Vision Lab

Learning Objectives

After this activity, students should be able to:

• State the range of their peripheral vision.
• State the range of their peripheral vision through camera lenses with different focal lengths.
• Explain how this knowledge will help them work towards answering the Grand Challenge.

Educational Standards

Each TeachEngineering lesson or activity is correlated to one or more K-12 science, technology, engineering or math (STEM) educational standards.

All 100,000+ K-12 STEM standards covered in TeachEngineering are collected, maintained and packaged by the Achievement Standards Network (ASN), a project of D2L (www.achievementstandards.org).

In the ASN, standards are hierarchically structured: first by source; e.g., by state; within source by type; e.g., science or mathematics; within type by subtype, then by grade, etc.

International Technology and Engineering Educators Association - Technology

State Standards

Materials List

Each group needs:

• protractor
• 3 x 5 index cards
• 5-foot rope
• camera, one that is capable of changing focal lengths
• Peripheral VIsion Worksheet

Worksheets and Attachments

Pre-Req Knowledge

An understanding of the definitions of peripheral vision and focal length, such as presented in the associated lesson, The Grand Challenge: Simulating Human Vision.

Introduction/Motivation

In this activity, you will practice seeing with your peripheral vision. Then you will repeat the experiment, but this time while looking through a camera lens. You will repeat the experiment a third time, this time looking through a camera lens with a different focal length.

Your task is to find the range of your vision in all three cases, and draw a conclusion on how this knowledge will help you solve the Grand Challenge.

Procedure

Before the Activity

• Gather materials and make copies of the Peripheral VIsion Worksheet.
• Write large letters on one side of 3 x 5 index cards. Make as many cards as groups of three in the classroom, all of different bold capital letters with the letters about as big as the card.

With the Students

Student 1 - Remains stationary at the protractor.

Student 2 - Moving at constant radius.

Student 3 - Measurer and recorder (on worksheet).

1. Attach the rope to the "base" of the protractor (what would be the center of the circle if it was a full circle).
2. Have Student 2 loosely tie the rope around his/her left ankle in a knot that can be easily undone. Hand that student a 3 x 5 index card with a letter written on it.
3. Have Student 1 stand with his/her toes along the flat edge of the protractor and look straight ahead.
4. Have Student 2 stand directly to the right of Student 1 with the rope pulled taut so that the protractor reads 180 degrees.
5. Have Student 2 walk slowly toward the center of vision using the rope as a marker to ensure a constant radius around the person while holding the index card at eye-level with the letter facing Student 1.
6. Have Student 1 indicate when they can first SEE the card out of the side of his/her eyes. Using the rope as an indicator, Student 3 measures and record sthe angle at which Student 1 can first SEE the card (reading the letter written on the card is not necessary for this step, just seeing the card is enough).
7. Have Student 2 continue to walk slowly toward the center of vision at the same constant radius and hold the index card in the same manner. Student 1 continues to look only straight ahead.
8. Have Student 1 indicate when s/he can first READ the card. Using the rope as an indicator, Student 3 measures and records the angle at which Student 1 can first READ the card.
9. Repeat steps 2 – 5 on the opposite side of the student (with rope tied to opposite ankle).
10. Now, have the student standing on the rope, look through the lens of a camera. Try a small focal length to begin with. Repeat steps 2-5.
11. Change the focal length of the camera to a larger setting and have students repeat steps 2-5.
12. Once students have finished this activity, have them draw conclusions on the similarities and differences in normal human vision and vision through a lens.

Vocabulary/Definitions

focal length: The distance between the surface of the mirror and the point to which light is focused.

lens (camera): A piece of transparent material used to focus rays of light.

peripheral vision: The outer part of the field of vision.

Assessment

Activity Embedded Assessment

Worksheet: Make sure students fill in the worksheet chart with the collected data and complete all three parts of the experiment (no lens, then lenses with two different focal lengths).

Post-Activity Assessment

Worksheet: Review students' completed worksheets to gauge their comprehension. Make sure they have determined the total range of their peripheral vision in all three parts of the experiment. Ask students to explicitly describe the difference between human eyes and camera lenses (in terms of vision). Make sure they have written conclusions and explained how they will use the conclusion to solve the Grand Challenge.

Copyright

Contributors

Supporting Program

Acknowledgements

The contents of this digital library curriculum were developed under National Science Foundation RET grant nos. 0338092 and 0742871. However, these contents do not necessarily represent the policies of the NSF, and you should not assume endorsement by the federal government.