Register to reply

Contact Lens: How to focus light 1mm away

by clalburn1420
Tags: contact, focus, lens, light
Share this thread:
clalburn1420
#1
Dec20-09, 04:08 PM
P: 12
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?
Phys.Org News Partner Physics news on Phys.org
Step lightly: All-optical transistor triggered by single photon promises advances in quantum applications
The unifying framework of symmetry reveals properties of a broad range of physical systems
What time is it in the universe?
Andy Resnick
#2
Dec20-09, 05:24 PM
Sci Advisor
P: 5,523
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
#3
Dec20-09, 06:53 PM
P: 12
Great link. Thanks a lot.


Register to reply

Related Discussions
Lens can focus the light to a smaller spot by ...? General Physics 3
What lens shape gives perfect focus? General Physics 9
Contact Lens safety Medical Sciences 10
Question on light intensity at the focus of a lens. General Physics 2