Table 1.

Clinical features of ARC and HMC patients during December 2014 and November 2017.

Category	ARC group	HMC group
Number of eyes	8850	4605
Ages (yrs)***	68.19 ± 7.93	63.26 ± 6.87
Gender (M/F)	2975/5875	1602/3003
Axial length (mm)***	23.30 ± 0.63	29.84 ± 2.39
LOCS III nuclear color grading***	2.66 ± 0.60	3.46 ± 1.00
Dark nucleus***	114 (1.3%)	434 (9.4%)
Vitreous liquefaction***	5112 (57.8%)	4104 (89.1%)

Values are presented as the mean ± SD (standard deviation). LOCS III: Lens Opacities Classification System III; NC: nuclear color. For ages, axial length and LOCSIII grading, *** P < 0.001, Student's t-test; for dark nucleus and vitreous liquefaction, ***P < 0.001, Chi-square test.