: Data-Field 5155

Data-Field 5155

Description:	3mm asymmetry index for irregular astigmatism level (left)
Category:	Assessment centre ⏵ Eye measures ⏵ Refractometry ⏵ Refractometer 1
	Physical measures

Participants

121,560

Categorical (single)

Both sexes

Jan 2012

364,158

Data

Defined (2)

Aug 2025

Complete

Primary

Yes (6)

o1 s1

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Data

364,158 items of data are available, covering 121,560 participants, encoded using Data-Coding 33.
Defined-instances run from 0 to 1, labelled using Instancing 2.
Array indices run from 0 to 5.

Graph illustrating main data

2 Instances

Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
107,394 participants, 312,422 items
Graph illustrating main data

Instance 1 : First repeat assessment visit (2012-13)
17,807 participants, 51,736 items
Graph illustrating main data

Notes

This is the asymmetry index of the level of irregular astigmatism (1=A, 2=B, 3=C) as part of the keratometry result taken at 3mm for the left eye

1 Related Data-Field

Field ID	Description	Relationship
5152	3mm asymmetry index for irregular as ...	Current Field is the opposite-side complement to Field 5152

3 Resources

Preview	Name	Res ID
$Preview of Auto-refraction measurement$	Auto-refraction measurement	100110
$Preview of Auto-refraction measurement close-up$	Auto-refraction measurement close-up	100111
$Link to Auto-refraction measurement using ACE$	Auto-refraction measurement using ACE	100242

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