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449 items of data are available, covering 449 participants, encoded using Data-Coding 56. Defined-instances run from 0 to 0, labelled using Instancing 2.
Against participant wishes69
Lack of time25
Unwilling to remove contact lenses13
Reason not known5
Other health reason14
Unable to understand instructions28
Other eye-related reason39
Reason visual acuity measurement (left eye) was not performed (entered as free-text by a UK Biobank Staff member).
This field was created by post-hoc coding the free-text reasons entered during the assessment centre visit. The encoding used was constructed after the data had been examined to determine suitable representative groupings.