Garry says: “I was working crazy shifts and felt absolutely exhausted. I knew I was unwell but I’d had chicken pox as a child I didn’t take it seriously until my vision began to be affected.”

Garry went to his GP and was immediately referred to hospital. Within four days he lost the sight in his left eye and within two weeks he lost 95 per cent of the vision in his right eye. He eventually lost his vision completely.