Table 1.

Vision Variables, Normative Values, and Pass/Fail Cut-off Values for Two Visual Impairment Criteria.

Vision Variables	“Normal” Values*	Visual Impairment Pass/Fail Criteria*
		Criterion 1	Criterion 2
High Contrast Acuity	20/20 (0.0 logMAR)	20/40 (>0.30 logMAR)	20/70 (>0.54 logMAR)
Low Contrast Acuity	20/27 (0.12 logMAR)	20/53 (>0.42 logMAR)	20/91 (>0.66 logMAR)
Low Contrast/Low Luminance Acuity	20/40 (0.30 logMAR)	20/80 (>0.60 logMAR)	20/138 (>0.84 logMAR)
Low Contrast Acuity in Glare	20/40 (0.30 logMAR)	20/80 (>0.60 logMAR)	20/138 (>0.84 logMAR)
Contrast Sensitivity	1.85 log units (1.4%)	<1.55 log units (2.8%)	<1.30 log units (5.0%)
Stereopsis	16 arcsec (pass all 3 plates)	>85 arcsec (fail ≥ 1 plate)	>320 arcsec (fail all 3 plates)
D-15 Color Vision	Color confusion score = 0	Color confusion score ≥30	Color confusion score ≥100
Standard Visual Field	0 errors	≥ 5% errors	≥ 10% errors
Impact of Attentional Task on Field	0 errors	≥ 25% errors	≥ 50% errors

^*Acuity measures are presented in Snellen equivalent and (logMAR). Contrast Sensitivity is presented in log units and % Weber contrast.