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Interesting link to the BMJ article.
The last sentence in paragraph 3 implies that the filters themselves are safe, unless there are any defects, but as one size does not fit all, there is 'leakage' which may cause damage to the eyes.
"However, concerns have been expressed about such viewers because a single size viewer is unlikely to fit all children’s faces accurately, because surface damage may compromise any protective effect, and because the importance of physical defects in the aluminium film remains uncertain."
Certainly agree with previous posts that accurate reporting would help, but 'Sun causes blindness' is a sexier headline than 'You can look at the Sun with the right equipment for short periods of time'.
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