. 2019 Nov 8;21(11):e14808. doi: 10.2196/14808

Table 3.

Refractive error and visual acuity measured in the mildly myopic participants (second-generation algorithm; N=86 eyes).

Refractive error and visual acuity	Manifest refraction^a	Web-based refraction^a	Difference	95% CI	P value^b	GEE model^c
Refractive error and visual acuity	Manifest refraction^a	Web-based refraction^a	Difference	95% CI	P value^b	Beta value	P value^c
Power vector (Diopter)^d	1.04 (0.86)	1.07 (0.96)	0.03	–0.13 to 0.06	.48	.82	<.01
J0 vector (Diopter)	0.05 (0.24)	–0.00 (0.23)	0.05	0.00 to 0.10	N/A^f	N/A	N/A
J45 vector (Diopter)	–0.14 (0.14)	–0.10 (0.16)	–0.04	–0.04 to 0.03	N/A	N/A	N/A
Spherical equivalent (Diopter)	–0.98 (0.88)	–1.00 (1.00)	0.02	–0.09 to 0.13	N/A	N/A	N/A
Spherical power (Diopter)	–0.78 (0.85)	–0.87 (0.96)	0.09	–0.03 to 0.20	N/A	N/A	N/A
Cylindrical power (Diopter)	–0.38 (0.41)	–0.26 (0.50)	0.12	–0.24 to –0.02	N/A	N/A	N/A
Cylindrical axis (degrees)	101 (59)	105 (50)	4	–27 to 19	N/A	N/A	N/A
Corrected distance visual acuity logarithm of the minimum angle of resolution^e,g	–0.14 (0.06)	–0.08 (0.10)	–0.06	–0.09 to –0.04	<.01	.15	.03
Corrected distance visual acuity Snellen^e,g,h	1.39 (0.20)	1.22 (0.29)	0.17	0.11 to 0.23	N/A	N/A	N/A

^aUnless otherwise specified, reported as mean (SD).

^bPaired-sample t test performed for predefined primary and secondary outcome parameter only.

^cGeneralized Estimates Equation model to statistically correct for the inclusion of 2 eyes of one subject, age, and sex.

^dSpherical and cylindrical power and axes were translated in vectors by Fourier analysis.

^eAssessed with either the manifest or Web-based achieved correction.

^fNot applicable.

^gSnellen: decimal visual acuity.

^hStatistical tests were performed only on predefined parameters (power vector for refraction and logarithm of the minimum angle of resolution for visual acuity).