Observation study


The purpose of our clinical observation study is to firstly determine prevalence of visual impairment by systematically evaluating all (consecutive admissions) stroke survivors within three geographically separate stroke units using validated orthoptic measures.


Three distinct units (hyper-acute stroke unit plus district general stroke unit) will enable representation to be drawn from different geographical areas with different demographics to ensure as representative a sample of stroke survivors as possible.


Secondly, the natural history and long-term outcome for visual impairment due to stroke will be determined by longitudinal follow-up of stroke survivors with objective diagnosis of visual impairment.


Recruiting centres

  • Aintree University Hospital NHS Foundation Trust

  • Salford Royal NHS Foundation Trust

  • Warrington and Halton Hospitals NHS Foundation Trust

Recruitment to the IVIS observation study commenced on 1st July 2014 and closed on 6th September 2015. Follow up was completed on 26th July 2016.