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1,520 items of data are available, covering 1,520 participants, encoded using Data-Coding 54. Defined-instances run from 0 to 0, labelled using Instancing 2.
Against participant wishes276
Lack of time25
Unwilling to remove contact lenses346
Reason not known17
Other health reason48
Unable to understand instructions0
Other eye-related reason517
Counts of participants/items last updated 05 Mar 2020.
Reason refractometry 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.