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患者，女性，58岁，右眼视物不清，眼前固定黑影3天。3天前患者无明显诱因晨起后出现右眼视物模糊，眼前黑影，相对固定，1天后未能缓解，黑影逐渐增大，变暗，发展为上半侧黑影。无畏光、流泪，无眼红、眼痛。患者否认心脏病、糖尿病、高血压等全身病史。平时血压偏低。眼科检查：VOD0．3，VOS1．0，双眼前段正常。进一步治疗是（）
A . A.血管扩张药物
B . 视神经营养药物
C . 神经生长因子
D . 观察
E . 改善全身情况
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