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Br J Ophthalmol 89:1427-1432 doi:10.1136/bjo.2005.067298
  • Clinical science
    • Scientific reports

Factors affecting the test-retest variability of Heidelberg retina tomograph and Heidelberg retina tomograph II measurements

Table 5

 Association (R2) between sources of variability and intraobserver/intravisit rim area differences (mm2)

Source of variability HRT Classic HRT Explorer HRT-II Explorer
R2 p Value R2 p Value R2 p Value
MPHSD = mean pixel height standard deviation, LOCS III = Lens Opacity Classification System III.
Reference height difference 0.7 <0.0001 0.7 <0.0001 0.5 <0.0001
Mean MPHSD 0.5 <0.0001 0.4 <0.0001 0.5 <0.0001
Central nuclear dip 0.1 0.005 0.3 <0.0001 0.2 <0.0001
LOCS III nuclear opalescence 0.1 0.001 0.2 0.0006 0.2 <0.0001
LOCS III nuclear colour 0.03 0.1 0.1 0.001 0.2 <0.0001
Cylindrical power 0.2 <0.0001 0.03 0.4 0.1 0.005
Spherical power 0.07 0.02 0.02 0.2 0.04 0.1
Spherical equivalent 0.04 0.08 0.01 0.3 0.02 0.2
Age 0.05 0.05 0.04 0.1 0.07 0.02
Baseline rim area 0.05 0.05 0.02 0.2 0.0003 0.9
Disc area 0.001 0.8 0.01 0.5 0.001 0.8
Intraocular pressure 0.05 0.05 0.05 0.07 0.01 0.4
LOCS III posterior subcapsular 0.01 0.4 0.001 0.8 0.005 0.6
LOCS III cortical 0.0001 0.9 0.005 0.6 0.01 0.5

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