For extra bases (no, not really) adjust the "Angle of Descent" to see how a little curve becomes a big one in your peripheral vision.
对于额外基地(没有，不真正地)调整“下降角”看小的曲线怎么成为一个在您的周边视觉。
2
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。
3
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?