新视力表是对数的，5.0是标准视力分辨力，6.0的意思就是角分辨力是正常人的10倍。

估计不是当真实测的，只是文学性的一句感叹：

The day after we arrived, we set out on an early morning safari. Our driver, Patrick, is the foremost guide in this area. His eyesight must be 6.0! He told us, "There's a rhinoceros over there." but we couldn't see a thing, even with binoculars. Then, after moving along in the Jeep through savanna for about 10 minutes, I saw that there really was a rhinoceros there!

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