1. The Eye
Part 2: Vision Problems and Corrections

2. Vision Problems Sometimes, people’s vision is not perfect.
When light does not fall directly on the retina, images will appear blurry.
Normal
This can happen in two major ways…

3. Sometimes, people’s vision is not perfect.
Vision Problems
Sometimes, people’s vision is not perfect.
When light does not fall directly on the retina, images will appear blurry.
The eye shape is not perfectly spherical.
The lens muscles do not work properly.
This can happen in 2 major ways…
Short
Long
Weak
Strong

4. Nearsightedness
Nearsightedness occurs when light is focused in front of the retina.
They see well near, but not far.
Causes:
Eye shape is too long
Lens is too thick
Fixed with a concave lens.

5. Nearsightedness

6. Farsightedness
Farsightedness occurs when light is focused behind the retina.
They see well far, but not near.
Causes:
Eye shape is too short
Lens made too thin
Fixed with a convex lens.

7. Farsightedness

8. Cataracts cause the lens to become cloudy.
Cataracts are a genetic condition that runs in families, particularly African Americans.
Cataracts cause a person to slowly lose their vision Blindness can result.

9. Cataracts: What is Seen

10. Glaucoma High pressure in the eye causes glaucoma.
Normally, fluid inside the eye is continually drained away by a drainage canal.
When this canal gets blocked, fluid builds up and pressure increases
eye fluid
This pressure pushes on the lens, affecting vision

11. Glaucoma: What is Seen

12. Any Questions?