Amy Williams of RNZ Eyesight experts warn there are children in New Zealand who have gone blind due to malnutrition, including a boy who eats only hot chips, crisps and the occasional Nutella sandwich. Blind Low Vision said it knows of nine people who are registered blind, whose vision loss was caused by poor diet. Two doctors who specialise in treating children's eye conditions said parents need to know extremely picky eaters risk losing their vision for good and it's preventable. Paediatric ophthalmologist Dr Julia Escardo-Paton said she has seen children who don't eat fruit and vegetables suffer from vitamin A deficiency, which can lead to blindness. "The worst one that I've seen, irreversible vision loss, was a child that was not known and is still not known to be autistic...but he has lost vision.…