This allows the patient to see near, intermediate and far without glasses.

Now, I have to do something first of all, switch to real glasses so I can actually see you, which would probably be a convenience. I don't know.

And in addition, we've actually used polarizers on all the lights just like polarized sunglasses can block the glare off of the road, polarizers can block the shine off of the skin, so we don't get all those specular reflections to take this map.