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 accommodate- change its own focal length. There are several optical models ('standard eye')- Liou and Brennan's is one:

http://www.contrastoptical.com/Serv...ystems/HumanEyeModeling/tabid/71/Default.aspx

So it's possible to figure it out.

 

[clalburn1420]

Great link. Thanks a lot.