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.