The UK lacks prevalence data on vision and hearing impairment and its causes within the population. The UK National Eye clinical trials

Vision and hearing impairment among the population - the UK National Eye Health and Hearing Study

This study is looking at how common vision and hearing problems are in people over 50 in Cambridgeshire and Peterborough. Researchers want to understand why these issues might go unnoticed and how best to help people. If you're invited, taking part would involve a free check-up.