optica光活性opticadj.视觉的；光学的optic dosimeter光辐射剂量计optic amplifier光电放大器opticopupillary视神经瞳孔的optic radiation视辐线optic disc area视盘面积optic binormals光轴副法线optic sway test视摆动试验optic thickness光学厚度optic scrambler光扰频器optic nervehead视神经乳头, 视神经盘