Effect of Pupil Size on Optical Quality Parameters in Astigmatic Eyes Using a Double-Pass Instrument

Table 2

Optical quality parameters of different pupil sizes in astigmatic eyes.

Parameters	Astigmatism	Artificial pupil size
		2 mm	4 mm	6 mm
MTF cutoff frequency (c/deg)	0 D	48.4±4.7	40.8±8.0	32.2±7.3
	1 D	38.7±7.5	26.6±6.3	21.4±5.8
	2 D	29.8±8.0	20.7±5.1	16.0±4.6
	3 D	27.2±8.8	17.3±6.2	12.6±6.5
Strehl2D ratio	0 D	0.30±0.10	0.26±0.07	0.17±0.05
	1 D	0.21±0.04	0.16±0.03	0.12±0.03
	2 D	0.16±0.05	0.12±0.04	0.09±0.01
	3 D	0.13±0.04	0.11±0.04	0.08±0.02

ANOVA: analysis of variance, MTF: modulation transfer function, D: diopters.