Table 6. Comparison of quantitative visual quality using the HD analyzer (OQAS) between the presbyopia correction group and the normal control group.

OQAS measurements	Presbyopia correction group	Normal control group	P
MTF cutoff frequency (cpd)	37.152±8.018 (17.101-54.91)	36.467±9.977 (19.005-54.731)	0.551
Strehl ratio	0.186±0.040 (0.1-0.271)	0.198±0.063 (0.095-0.399)	0.466
OSI	1.026±0.473 (0.3-2.2)	1.007±0.789 (0.2-3.3)	0.202
Accommodation, range (D)	1.182±0.305 (0.344-1.854)	0.984±0.254 (0.357-1.542)	0.004

OQAS: Optical quality analysis system; MTF: Modulation transfer function; cpd: Cycle per degree; OSI: Objective scattering index; D: Diopters. Independent t-test was used for statistical analysis. P values <0.05 were considered statistically significant.

mean±SD (range)