However, he warned anyone thinking of photographing bubbles to take care if using an optical viewfinder, as the reflected sun could potentially damage the retinas.

但是他提醒那些想拍摄肥皂泡的爱好者，如果使用光学反光镜，太阳光的反射可能会损害视网膜。

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WHO, its Member States and partners are working to find ways to provide local, affordable corrective optical services to people in need, especially in poor areas with limited eye care services.

世卫组织、各会员国和合作伙伴正在努力寻找解决办法，为有所需要的人提供就地、收费适宜的眼科矫正服务，尤其在那些贫困、缺乏眼科治疗服务的地区。

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