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3,164 items of data are available, covering 3,164 participants, encoded using Data-Coding 54. Defined-instances run from 0 to 0, labelled using Instancing 2.
Against participant wishes457
Lack of time1709
Unwilling to remove contact lenses214
Reason not known187
Other health reason39
Unable to understand instructions7
Other eye-related reason267
Counts of participants/items last updated 05 Mar 2020.
Reason optical coherence tomography 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.