Dr. Glen Jeffery

And that was, we'd put on a very high resolution monitor, say the letter T in blue, and then we'd add loads and loads of visual noise to it in the background, or we'd have an F in red, visual noise.

And then we found the threshold at which they could see that letter and happily identify it.

So we found out what their visual ability was for colors.

We then gave them a burst of red light,

to improve their mitochondria in cells that are very mitochondrial dependent.

And we then brought them back and we found the threshold had changed.

That threshold had improved in every one of those subjects bar one.

Okay.

It's very simple.

Of all the people we've tested, we've got an improvement.

And there's very large numbers of them, except one subject.

Ah, you're saying but one.

No, no, no.

If you look over the population, the size of the effect is around 20%.

It's very substantial.

But our ability to improve...

visual function varies enormously between individuals.

You said, but one.

This is a UK, US- Yeah, sorry.

So in our first experiments, we used 670 nanometers, right, which is a deepish red light.