: Data-Field 5266

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Data

131,237 items of data are available, covering 127,299 participants.
Defined-instances run from 0 to 1, labelled using Instancing 2.

Average compound dataset is 1.3Kb, largest is 1.6Kb.

2 Instances

Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
111,801 participants, 111,801 items
Data not meaningful for statistical summary

Instance 1 : First repeat assessment visit (2012-13)
19,436 participants, 19,436 items
Data not meaningful for statistical summary

Notes

The 400 applanation values describe the reflected light signal from the cornea 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).

1 Related Data-Field

Field ID	Description	Relationship
5258	Applanation curve (right)	Current Field is the opposite-side complement to Field 5258

3 Resources

Preview	Name	Res ID
	Cornea applanation curve example	1
	Intra-ocular pressure measurement using ACE	100236
	Intraocular pressure measurement	100112

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