Preposition "to"

Hello, helpers!

You've been a great help every time I visit. Thank you so much.

I'm in a trouble this time because I want to say the following sentence is grammatically wrong because they used prepositions in the wrong place or in the wrong way. But I'm not a native user of English. So I need your support.

So please help me... Support me... or Correct me!!!

The Neanderthals' low light conditions let the size of a retina be increased more to evolutionary response in low light conditions.