Deepak Chopra has a technique for improving sight (focus) & vision (sensitivity of the nerves) I don't have his permission to share this but I'm sure He wouldn't mind.

Sight: hold up a pencil or finger at the distance closest to your face where you can still focus on it comfortably. Now face some distant target that you can comfortably focus on (this is your Infinity target).

Now alternate your focus between each target, waiting long enough for the eye to fully focus on each. Do it for a minimum of 10 to a maximum of 30 times every day. Your sight will improve but by how much I can't say. I had poor vision & I tried this. It really works.

Vision: look at the early morning sun with your eye closed, (NOT OPEN) & allow the light receptors at the back of the eye to be stimulated. Look for 30 seconds & then away with the eyes still closed. Gently massage the eyelids in a circular Motion. & watch the lightshow. Repeat if necessary but only to a maximum of 3 times.

This is not really a metaphysical solution but I have come across pinhole glasses lately through one of my friends. It can improve your eye sight in many ways. This site gives a good summary of how it works and the benefits.

I managed to get hold of one of the glasses. However, I have only used it a few times so far. But the few times that I have worn it and then taken it off, I can instantly see the an improvement in my eye sight. There is more clarity and focus. I am short sighted and I currently wear prescription glasses when I drive. Apparently I don't need to wear it any other time. I am hoping to see a gradual improvement through using the pinhole glasses.