138,201 items of data are available, covering 133,932 participants, encoded using Data-Coding 7
Defined-instances run from 0 to 1, labelled using Instancing 2
: Initial assessment visit (2006-2010) at which participants were recruited and consent given
117,873 participants, 117,873 items
Instance 1 : First repeat assessment visit (2012-13)
20,328 participants, 20,328 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.
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