At that point, it can be too late to improve or restore vision.

到那时可能为时已晚，无法改善或恢复视力了。

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The investigators will also be looking for signs that the cells helped restore vision.

研究人员也在寻找迹象表明这些细胞帮助恢复视力。

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They have grown tiny sheets of RPE cells in the lab and have shown these can restore vision in rats and pigs.

他们已经在实验室中培育出rpe细胞薄片，而且证明这可以使白鼠和猪恢复视力。他们希望明年初可以进行第一次的人体试验。

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So there are a lot of researchers working to restore vision in these patients by developing an artificial implant that can take the place of those lost cells.

FORBES: Second Test Of Retinal Implant Shows Restored Vision To The Blind

Previous research has shown it is possible to restore some vision by stimulating these nerve cells with electric implants.

BBC: NEWS | Health | Spinach may hold blindness cure

In March 2013, the Argus 2 was approved by the FDA for use in the United States and has the capacity to restore functional vision from people suffering from blindness.

FORBES: Artificial Retina From A Photovoltaic Polymer