RNIB invites Glastonbury attendees to take a 'Karaoke Eye Test' in awareness push

The Royal National Institute of Blind People (RNIB) is poised to run an experiential push during Glastonbury encouraging music lovers to make sure they book eye tests. 
For the awareness push, the RNIB will put the vision of revellers to the test by giving them the chance to perform their favourite karaoke songs – but there's a catch, the lyrics on-screen will decrease in size line-by-line, as if they were undergoing a traditional eye test. 
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