Doctors followed the patients for up to 21 months,and preliminary evidence hints that the device is working: All six had substantial improvement in their vision,says Chow.

• 医生对这些患者进行了为期21个月的跟踪研究。初步迹象表明人造视网膜发挥了作用。周说，所有6名患者的视力都有实质性的改进。