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Homework Help: Corrective lenses, power of the eye change

  1. Aug 24, 2011 #1
    Ok so i'm doing my physics assignment on optics and have come to a point where i seriously need help.

    I need to talk about how a corrective lens, in particular contact lens, changes the optical power of the eye to suit different refractive errors.

    I need to know how a contact lens changes the optical power of the eye when treating myopia. I am not looking for an answer about the focal length, I understand that.
    Any relevant help is is greatly appreciated
     
  2. jcsd
  3. Aug 24, 2011 #2

    tiny-tim

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    Hi DJ-Smiles! :wink:

    When the muscles are relaxed, light "from infinity" needs to be focussed on the retina.

    A refractive error means that it isn't, and the corrective lens makes it so again. :smile:
     
  4. Aug 24, 2011 #3
    Re: Urgent !!! Corrective lenses, power of the eye change

    cheers i needed that :smile:
    I was having trouble understanding it
    thanks
     
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