1.   The story is that slightly better eyesight will enable animals to avoid death and find food slightly more effectively.

2.   Intermediates could see even less well than their imperfect ancestors, and it is no consolation that they are building better eyesight for their remote descendants!

3.   If I were younger, with more patience and better eyesight, I might install a vise on the workbench for tying flies.

4.   Improved techniques for corrective laser eye surgery could give people much better eyesight than those with so-called normal vision, say researchers in the United States.