A top beautician contracted skin cancer when her varifocal lenses acted like a ‘magnifying glass’.Jo-anne Jewett, who counted Princess Diana and Madonna among former clients, was shocked to find she had a melanoma after living in Greece for a year.  Despite using a high UV protection lotion, Mrs Jewett, 57, contracted the tumour when the skin just below her eyes was burned by magnified sunshine. She had also assumed the high-end eye cream she had used for over 30 years contained protection against harmful rays.