Data
70,800 items of data are available, covering 35,577 participants, encoded using Data-Coding 
1209.
Defined-instances run from 0 to 1, labelled using Instancing 
2.
Array indices run from 0 to 5.
 
2 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
31,137 participants, 61,076 items
Instance 1 : First repeat assessment visit (2012-13)
4,865 participants, 9,724 items
 
Notes
This data field means the result is unreliable for the regularity index of the keratometry result taken at 6mm for the right eye
1 Related Data-Field
| Field ID | Description | Relationship | 
| 5147 | 6mm regularity index unreliable (left) | Field 5147 is the opposite-side complement to  Current Field |