: Data-Field 5259

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Data

131,758 items of data are available, covering 127,798 participants.
Defined-instances run from 0 to 1, labelled using Instancing 2.

Average compound dataset is 1.4Kb, largest is 1.4Kb.

Counts of participants/items last updated 25 Jul 2021.

2 Instances

Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
112,247 participants, 112,247 items
Data not meaningful for statistical summary

Instance 1 : First repeat assessment visit (2012-13)
19,511 participants, 19,511 items
Data not meaningful for statistical summary

Notes

The 400 pressure values describe pressure extered as the cornea travels inward and outward through the bi-directional applanation process. The sampling rate is 75microseconds/sample. One sample is a pressure and applanation pair. The pressure and applanation values are analog-to-digital values representing voltages levels such that 0=0.0volts and 1023=5.0 volts (approximately 4.89mV/count).

5 Categories

Category ID	Description	Items
100000	Assessment Centre	+2145
100013	Eye measures	+153
100015	Intraocular pressure	18
706	Physical measures	575
100006	Physical measures	+419

1 Related Data-Fields

Field ID	Description	Relationship
5267	Pressure curve (left)	Field 5267 is the opposite-side complement to Current Field

3 Resources

Preview	Name	Res ID
	Intra-ocular pressure curve example	2
	Intra-ocular pressure measurement using ACE	100236
	Intraocular pressure measurement	100112