Table 1.

Characteristics of the Three Patient Cohorts for Each of Three Autorefractors; Adaptica 2WIN, Plusoptix A12 and Welch Allyn SPOT. Q1 and Q3 are Interquartile Ranges. K-W is Kruskall-Wallis Expressed as Chi-Squared with 2 Degrees of Freedom. S.D. Is Standard Deviation the Devices Compared with Analysis of Variance (ANOVA) Represented by F Statistic. The Ages, Then the Results from Refined Retinoscopy for Cylinder, Sphere and Anisometropia Defined by Either Spherical Equivalent or Meridional Definition. Finally the Visual Acuity-Compared Refractions are Demonstrated by the Alaska Blind Child Discovery (ABCD) Composite Ellipsoid Metric.

		Count	<4 Years	Median	Q1	Q3	K-W	Mean	S.D.	ANOVA
	Age			7	5	11	X2(2)=86	8	4	F(2,2713)=43
Age	2WIN	1335	331	7	4	10	p<0.001	7	4	p<0.001
	PlusoptiX	628	93	7	5	11		8	4
	SPOT	755	30	8	6	12		9	4
Exam	Cylinder (maximal)						X2(2)=33			F(2,2715)=22
	2WIN			0.75	0.3	2	p<0.001	1.27	1.34	p<0.001
	PlusoptiX			0.75	0.3	2		1.21	1.27
	SPOT			1	0.3	2.75		1.65	1.65
	Sphere (right eye Spherical Equivalent)						X2(2)=0.8			F(2,2715)=2
	2WIN			0.5	−0.5	2	p=0.69	0.75	2.57	p=0.11
	PlusoptiX			0.5	0	1.13		0.6	1.44
	SPOT			0.63	0	1.25		0.57	1.43
	Myopia (meridional)						X2(2)=3.6			F(2,2715)=3
	2WIN			0	−1.3	1	p=0.16	−0.11	2.7	p=0.5
	PlusoptiX			0	−1	0.75		−0.15	1.68
	SPOT			0	−1.3	0.5		−0.36	1.76
	Hyperopia (meridional)						X2(2)=6.3			F(2,2715)=4
	2WIN			1.05	0	3	p=0.04	1.54	2.64	p=0.02
	PlusoptiX			1	0.5	1.75		1.24	1.7
	SPOT			1	0.5	2		1.44	1.69
	Anisometropia (meridional)						X2(2)=11			F(2,2715)=2
	2WIN			0.25	0	0.75	p=0.004	0.65	0.98	p=0.11
	PlusoptiX			0.25	0	0.75		0.55	0.97
	SPOT			0.25	0	0.75		0.63	1.1
Compare	ABCD Ellipsoid Composite						X2(2)=82			F(2,2730)=22
	2WIN			1.92	1.3	2.83	p<0.001	2.19	1.42	p<0.001
	PlusoptiX			1.48	0.9	2.32		1.89	1.57
	SPOT			1.46	1	2.16		1.78	1.34