140,693 items of data are available, covering 135,914 participants, encoded using Data-Coding 7
Defined-instances run from 0 to 3, labelled using Instancing 2
: Initial assessment visit (2006-2010) at which participants were recruited and consent given
117,821 participants, 117,821 items
Instance 1 : First repeat assessment visit (2012-13)
20,325 participants, 20,325 items
Instance 2 : Imaging visit (2014+)
2,460 participants, 2,460 items
Instance 3 : First repeat imaging visit (2019+)
87 participants, 87 items
Participant asked "Currently has infectious eye condition (e.g. viral conjunctivitis)?" as a screening question for the eye investigations.
Infectious participants were excluded from all investigations where there was a chance the problem could be passed on to subsequent users of the equipment - i.e. they were only eligible for the visual acuity test.