4. Ask your favorite dog if eyes matter.
What do most dogs use vision for?
5. Maintaining visual acuity is critical for many important daily
tasks. However, women seem to spend a lot of time on the
exterior of their eyes. Why is this so important?
6. Why do we have eye lashes? Are they
primarily used to flash signals to others?
Are they used to protect our eyes? Would
we be fine with no lashes?
7. Vision is very important in helping us navigate our
environment. We can avoid dangerous situations
such as physical obstructions, wild beasts, and
crazy people.
8. What do we communicate with our eyesight?
How important is eye contact when deciding to
speak to someone you do not know very well?
9. What is the eye message being
communicated in these photos?
16. Vision occurs when light is reflected
from an object and enters the eye. The
lens helps focus the light as the eye
converts it into electrochemicals
which are sent to the brain and “seen”
as an image.
17. Once light has passed through the eye and has been
converted to electrical messages, the visual information
moves through the optic nerve where half of the messages
from each left and right eye move to the opposite side of
the brain. View this gif to see how it works.
48. Disease or old age can create cataracts on the lens
of the eye. How do cataracts affect a person’s
vision? Can anything be done to repair the eye?
49. Laser surgery is available to remove the cloudy lens and
replace it with a man made lens. The surgery can be
done in less than 30 minutes in the doctor’s office.
50. What happens to your eyes when you
enter a dark room? Why do you think
that occurs?
51. Looking into someone’s eyes can help diagnose whether
or not they have sustained a concussion from a fall or
blow to the head. When a light is flashed in their eyes,
the pupils should get smaller. If not, a concussion is most
likely present. The eyes can be a window into our brain.
52. Group Discussion
Meet in groups and discuss the
following.
1. Describe how the visual system works.
2. Identify some of the diseases that can affect the
visual system.
53. Prepare to Write
Write an explanatory essay describing
how the visual system works and how
problems can affect the visual system.
54. How Your Eyes Work
2 min excellent
• https://www.youtube.com/watch?v=i3_n3Ibfn
1c
55. A Journey Through the Visual System
5 min excellent
• https://www.youtube.com/watch?v=EskTnxBo
PoI
