Or if you need vision correction, you might get an extra pair of prescription eyeglasses.

如果你需要校正视力，你可能需要一副有度数的眼睛。

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But was an extra photopigment all that was needed to evolve trichromatic vision? Or does seeing the world in all its colourful splendour require extra brain power too?

但是是否另一种感光色素必须完全进化成三色视觉？或者要看到世界所有颜色需要特别的脑部功能？

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ResultsAfter extra PRP, vision was improved in 12 eyes (18.4%), unchanged in 36 eyes (55.4%) and decreased in 17 eyes (26.2%).

结果超全视网膜光凝术后视力提高12眼(18.4%)，视力不变36眼(55.4%)，视力下降17眼(26.2%)。

youdao

Under the Merida Initiative, the United States will provide extra kit (such as night-vision gear and metal detectors) and training.

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