the point where the optic nerve enters the retina; not sensitive to light
双语例句
Funduscopy of the right eye revealed an edematous optic disc and macular star.Detailed diagnostic investigations failed to demonstrate a cause. 发病后一周，再检查病人眼底，发现右眼眼底视神经乳头仍水肿外，此时合并出现了星状黄斑，左眼则仍是正常。
Marked pallor occurs in complete optic atrophy, when there is blindness or severe visual impairment. 在完全性视神经萎缩时，视盘出现明显的苍白色，此时有失明或严重的视力障碍。
Thrombosis of the central vein produces a dramatic picture with massive haemorrhages and exudates radiating out from the optic disc. 中央静脉血栓产生引人注目的眼底像，即可见大量出血和渗出斑从视盘呈放射状排列。
