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1,398 items of data are available, covering 1,398 participants, encoded using Data-Coding 54. Defined-instances run from 0 to 0, labelled using Instancing 2.
Against participant wishes267
Lack of time25
Unwilling to remove contact lenses354
Reason not known34
Other health reason42
Unable to understand instructions3
Other eye-related reason388
Reason refractometry measurement (right 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.