Contact Lens: How to focus light 1mm away

clalburn1420

So, I've been wondering. Anyone know what shape/prescription a contact lens would have to be in order for an eye to be able to focus on something 1mm away (assuming the distance of focus in the eye is around 4 cm)? Does it have to do with focal length of the lens?

Andy Resnick

That's tricky to answer since the eye can accomodate- change its own focal length. There are several optical models ('standard eye')- Liou and Brennan's is one:

http://www.contrastoptical.com/Servi...1/Default.aspx

So it's possible to figure it out.

clalburn1420

Great link. Thanks a lot.

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clalburn1420	Contact Lens: How to focus light 1mm away Tweet So, I've been wondering. Anyone know what shape/prescription a contact lens would have to be in order for an eye to be able to focus on something 1mm away (assuming the distance of focus in the eye is around 4 cm)? Does it have to do with focal length of the lens?

Andy Resnick Recognitions: Science Advisor	That's tricky to answer since the eye can accomodate- change its own focal length. There are several optical models ('standard eye')- Liou and Brennan's is one: http://www.contrastoptical.com/Servi...1/Default.aspx So it's possible to figure it out.