Vision problems and how lenses can be used to correct them.
Describes the differences between nearsightedness and farsightedness.
Reviews the role of the eye in vision and the causes and corrective lenses for myopia and hyperopia.
Learn how some vision problems can be corrected by surgery performed with lasers.
Learn about the eye disease called macular degeneration and the telescopic contact lenses that have been developed to correct it.
Lesson 6 of this website provides additional information about the eye and vision correction.