Table 6.

Accommodative Lag (in diopters) for a 4-D Badal Target when Children Were Measured with Their Habitual Prescription during Years 1 and 2 of the Study

	Treatment Group Mean Lag (±SD)
	SVLs	PALs
Year 1 (SVLs vs. PALs)
6-month visit	n = 43	n = 40
Habitual Rx (no add)	1.55 ± 0.45	1.55 ± 0.38
Habitual Rx with +2-D add	—	1.22 ± 0.25
Lag reduction with add	—	0.33 ± 0.34
12-month visit	n = 43	n = 41
Habitual Rx (no add)	1.54 ± 0.40	1.63 ± 0.41
Habitual Rx with +2-D add	—	1.21 ± 0.27
Lag reduction with add	—	0.42 ± 0.38
Mean lag experienced*	n = 43	n = 41
	1.55 ± 0.37	1.22 ± 0.21†
Year 2 (all wear SVLs)
18-month visit	n = 41	n = 39
Habitual Rx (no add)	1.69 ± 0.62	1.67 ± 0.50
24-month visit	n = 42	n = 41
Habitual Rx (no add)	1.54 ± 0.35	1.70 ± 0.39
Mean lag experienced	n = 42	n = 41
	1.61 ± 0.40†	1.68 ± 0.40 †

Habitual prescription is defined as the prescription in the study spectacles worn to the visit.

^*Mean of the 6-month and 12-month habitual lag values when wearing the assigned spectacle type (SVL [habitual Rx] or PAL [habitual Rx with +2-D add]).

^†For children not seen at the 6-month or 18-month visit, the 12-month or 24-month lag value, respectively, was used as the child's mean value.