Farsighteness vs. Nearsightedness, An Explanation

In this video Mr. Swarthout goes over the difference between farsightedness and nearsightedness. Included is a description of why this vision problem occurs, what can and cannot be seen, the types of lenses used for vision correction and how the lenses change the path of the light rays entering the eye. You can a listing of all my videos from my website, http://www.stepbystepscience.com