http://www.ck12.org Chapter 5. Energy
5.60 Vision Problems and Corrective Lenses
- Identify common vision problems.
- Explain how lenses can correct vision problems.
If you’ve ever had your vision checked, you’ve no doubt been asked to read an eye chart like the one in this cartoon.
The patient in the cartoon must be having trouble making out the letters in the second row of the chart, because he
asks the doctor for a hint (in the style of a popular TV game show). The patient clearly has a vision problem.
Problems with Vision
Many people have problems with theirvision, or ability to see. Often, the problem is due to the shape of the eyes
and how they focus light. Two of the most common vision problems are nearsightedness and farsightedness, which
you can read about below. You may even have one of these vision problems yourself. Usually, the problems can be
corrected with contact lenses or lenses in eyeglasses. In many people, they can also be corrected with laser surgery,
which reshapes the outer layer of the eye. For a video about vision problems, go to this URL: http://www.youtube.c
om/watch?v=ekSGbXt4XdI
MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/5056