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世界卫生组织(WHO)(1973)制定的低视力与盲的标准中二级低视力是指( )。,最佳矫正视力(双眼中好眼)低于0.3,且等于或优于0.1,最佳矫正视力(双眼中好眼)低于0.1,且等于或优于0.05(1米指数),最佳矫正视力(双眼中好眼)低于0.1,且等于或优于0.05(3米指数),