No significant cell surface stains, white spots, if obvious, single area of <0.4mm2, in the central region, not more than 1, edge does not exceed 3, number less than 1, the same component allows up to 2
Cell surface without obvious stain, white, if obvious, single area <0.4mm2, when the center area is not more than one, the edge area is not more than three, the number of ≤1 months, with a maximum of two components
Cell surface no obvious stains, white spot, if clear, monolithic area < 0.4mm2, in the central region of not more than 1, edge area not more than 3, a number less than or equal to 1, a single component allows up to 2