I could predict that there would be no reliable color perception, which is crucial for face recognition, and that there would be only scotopic vision, which means there would be very little resolution, what we call boundary or edge detection, and that furthermore, because the eyes would have been totally dilated under this light, the depth of field, the distance at which you can focus and see details, would have been less than 18 inches away.
我能断定 当时的光照不足以分辨不同的颜色（视网膜锥状细胞负责感知颜色） 也就不能准确的辨别人脸， 而当只有暗视觉的时候 能看到的清晰度就大打折扣 这个时候只能够看清物体的轮廓， 因为在这样的光照条件下， 眼睛会完全失去焦点，无法对焦， 这个时候你能看到的范围 不会超过18英寸。