Visit The Physics Classroom's Flickr Galleries and enjoy a photo
overview of the topic of refraction and lenses.What About
Astigmatism? Learn about astigmatism at Microscopy
University.LTU Physlet: Optics Model for a Far-Sighted Eye (with
corrective lenses) Use this Java applet to explore the
correction for a farsighted eye. And click here to explore the
nearsighted eye. Use this Java applet to demonstrate the problem
of farsightedness and its correction. And click here to explore
the nearsighted eye. Farsightedness and its Correction The human
eye's ability to accommodate allows it to view focused images of
both nearby and distant objects. As mentioned earlier in Lesson
6, the lens of the eye assumes a large curvature (short focal
length) to bring nearby objects into focus and a flatter shape
(long focal length) to bring a distant object into focus.
Unfortunately, the eye's inability to a provide a wide variance
in focal length leads to a variety of vision defects. Most
often, the defect occurs at one end of