Preventing Falls in Older Multifocal Glasses Wearersby Providing Single-Lens Distance Glasses: The Protocol for the VISIBLE Randomized Controlled Trial

Approximately 580 older people who are regular wearers of multifocal glasses people will be recruited. Participants will be randomly allocated to either an intervention group (provision of single lens glasses, with counseling and advice about appropriate use) or a control group (usual care). The primary outcome measure will be falls (measured with 13 monthly calendars). Secondary measures will be quality of life, falls efficacy, physical activity levels and adverse events.