eye test for a new pair to reveal a giant deadly brain tumour. Beth McKendrick Rafferty, 14, who has worn glasses since she was a toddler, was blighted with 'stabbing' headaches and assumed it was a sign she needed her prescription upgrading.During a routine eye appointment at Specsavers, Beth, then 12, passed the reading tests with flying colours so was baffled by what was causing the crippling pain.