We describe a model of the human eye that incorporates a variable converging lens. The model can be easily constructed by students with low-cost materials. It shows in a comprehensible way the functionality of the eye's optical system. Images of near and far objects can be focused. Also, the defects of near and farsighted eyes can be demonstrated.
REFERENCES
1.
PASCO Human Eye Model, Catalog No. 84777, http://store.pasco.com/pascostore/showdetl.cfm?&DID=9&Product_ID=56044&Detail=1.
2.
Available from several sources. See, for example, American 3B Scientific, https://www.a3bs.com/shop/u.s.a./eye_models/functional_eye_w16002,p_3_65_30_0_4129_searchresult_1_image_movie.html.
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A. Maheshwari and D.R.Williams, Learning Optics Using Vision; http://textonly.cfao.ucolick.org/EO/Resources/Learn_optics_AO.pdf.
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© 2008 American Association of Physics Teachers.
2008
American Association of Physics Teachers
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