Findings highlight importance of blade sharpening before cutting onions Sign up for our free Health Check email to receive exclusive analysis on the week in health Get our free Health Check email Get our free Health Check email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice Cutting onions slowly and using the sharpest knives available can reduce eye irritation , physicists have found in a new study. A familiar and