The proper question is; How did an undirected natural force know how to clear an eye lens up, before knowing clarity is an issue? Did it call a temp enzyme service to check which did the trick?
Nothing "knew" to clear lenses up, and no critter had to think, "Gee, you know, if I only had clearer lenses everything would be better." Those critters with clearer lenses (or, more sharply focussed images, or more light-sensitive retinas) could find food or evade predators better than those with cloudier (or blurrier, or dimmer) images, and they are the ones whose genes propagated to the next generation with greater probability. Lather, rinse, repeat ... for millions if not billions of years.
Flowing water doesn't "know" to make pebbles round, but a sharp corner sticking out is more likely to be rubbed off than a smooth surface. Repeat a million times, and you get wonderful, smooth spheres even without any design or designer. (This is admittedly a poor analogy to natural selection: no reproduction is present.)
The proper question is; How did an undirected natural force know how to clear an eye lens up, before knowing clarity is an issue? Did it call a temp enzyme service to check which did the trick?
Or even another question...how would a cloudy eye tissue survive over a billion years (since it would be useless) and "evolve" into a clear lens? Can't have it both ways, you know