Table 2.

Comparison of image sharpness by field of view

Phase-plate adjustment	Area	On-axis	Nasal	Temporal	Inferior	Superior
Phase-plate adjustment	Full	1.07 ± 0.03	1.09 ± 0.03	0.99 ± 0.04	1.09 ± 0.06	0.97 ± 0.03
	Peripheral	0.99 ± 0.03	1.02 ± 0.03	0.93 ± 0.04	0.98 ± 0.05	0.88 ± 0.03
	Full-peripheral difference (%)	−7.0 ± 0.5	−6.9 ± 0.5	−6.0 ± 1.5	−10.5 ± 0.6	−10.0 ± 0.7
	p-Value (full vs peripheral)	<0.001	<0.001	<0.001	<0.001	<0.001
Without phase-plate adjustment	Full	0.89 ± 0.05	0.90 ± 0.05	1.38 ± 0.08	0.94 ± 0.05	1.25 ± 0.06
	Peripheral	0.613 ± 0.04	0.610 ± 0.04	1.124 ± 0.10	0.761 ± 0.05	1.083 ± 0.06
	Full-peripheral difference (%)	−31.8 ± 1.3	−32.7 ± 1.5	−20.7 ± 2.7	−20.2 ± 1.9	−14.2 ± 1.3
	p-Value (full vs peripheral)	<0.001	<0.001	<0.001	<0.001	<0.001
Increase in “Full-peripheral difference” phase-plate adjustment included (%)		25.1 ± 1.4	26.0 ± 1.5	15.6 ± 1.9	9.8 ± 1.8	4.2 ± 1.2
p-Value (full-peripheral difference, phase-plate vs without phase-plate		<0.001	<0.001	<0.001	<0.001	<0.001

Data presented as means or % ± standard error. p-Value was determined using t-test.