I'm short-sighted, and during a recent haircut realised that objects far behind me still looked blurry in the mirror. If the light is reflecting from the mirror (which wasn't far away), why is it blurry?

This may seem like a rediculous question, but i have noticed that it is much easier to know when a person is looking into your eyes than it is to know if they are looking at another similarly sized object. How is it that we know when a person is giving you eye contact?

I've heard from a few sorces that we can now input computational images into the eye. The sources didn't go into much detail on how to do this, but I am buessing that they figured out how visual images are processed through our Optical Nerve, and - after some lengthy reasearch - were able to imitate these electrical nerve pulses and hook up a wire directly into the part of the brain which processes images.

Is this right, and if so, then why does it work? Shouldn't the patient feel some sort of electrical current flowing throught their brain? Why does the patient's brain recieve the image as if it were a normal image from out eyes?

Do we all perceive color the same way ? for example do we all see the same color green or is the word green or red or blue just names to tag how we perceive those color. If I switched eyes with someone he might see the grass the same way as I perceive the sky but still call it green even though for me it would be blue.

The same goes for colorblind people (those unfortunate to mix up colors) if they were brought up seeing the grass as we would see it red. He would say green to everything red if we were able to see through his eyes. It would rely on education then.

Do I make sense ?

Specifically, how is the reading part of the lens held in the correct position?

Gino Trulli, Terracina, Italy

While out walking today, my son asked me another question I couldn't answer. He said that we're all told not to look directly at the sun, it's bad for our eyes; but what if a camera had filmed the sun, then we watched it on television - would that still be bad for our eyes?

Peter Finan

Haworth

West Yorkshire

I can only raise my left eyebrow by itself to look quizzical. My right eyebrow won't work in the same way, although I can do both at once. Any ideas why this is? I'm right-handed, if that helps.

Polly Asquith, Paris, France