Flown to Britain by the Fight for Sight charity to publicize the dangers of eclipse-watching, he admitted that he hoped for bad weather over Wednesday's total eclipse of the sun.
``I wish for clouds so people won't get hurt,'' he told Reuters.
His mother Darcy said: ``Coming down on the train, David kept looking at all the kids and saying that he did hope their eyes wouldn't get burned.''
David visited his local planetarium last year to view an eclipse through telescopes and special goggles. He was told they were safe and supervised.
The damage took just seconds. There was no pain but within days, he told his mother about trouble in his left eye.
The sun's radiation had burned a hole in his retina. It was as if a cigarette had stabbed him in the eye.
There is no known treatment for solar retinopathy and the blind spot will remain in David's eye for the rest of his life.
Now he has to wear special goggles when playing his beloved baseball.
``I just hate it when other kids make fun of me, which they do,'' he said.
Asked what he could now see with his left eye, he said: ''There is a black spot covering where your nose is and the rest all around is a blur.''
Pleading to the millions of people who may be tempted to gaze unprotected at the heavens Wednesday, he said: ``Don't ever, ever look directly at the sun even if this is a once-in-a-lifetime experience.''
His advice: Turn your back to the sun and use a pin-hole card to project indirect images of the sun onto another card.
``I would keep young children inside,'' his mother said. ''You won't be able to stop them looking up. Watch it on TV instead.''
After Britain's last eclipse in 1927, at least 20 people went blind. Doctors fear that figure could soar this time -- despite all the publicity mounted by the government in a public safety campaign.
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