Here's a diagram between a 15 pixel camera and that the normal eye goes for 574 megapixels. The 15 pixel security camera has a creator proving that it does not come by accident. Yet for the atheist, they would believe that nature and eye has an accident. It just reminds me of a stubborn atheist who said, "Well the camera didn't have a magic wand, it was not magically created like you creationists claim that we were magically created." That has to be plain double standard considering that they claim they don't believe in hocus pocus yet it requires hocus pocus before the eye can be so fantastically well-assembled with all its complex networks. If the camera requires a blueprint and some careful assemblage before it comes a functional camera, how much more would the eye require an Intelligent Designer.
Take a look at the parts of the human eye. If you had to study for a biology exam that requires you to label each part of the eye, don't you need to systematically memorize the eye before you know how it functions? Even every part of the human eye has a function. To fully understand the human eye requires diligent study of its magnificently complex structure. Even studying just one part of the body shows that life is not a mere accident as many people want to believe. All these parts would have not been in their place by accident.
Even if God gave them more signs than just the wonders of nature, they will still continue to harden their hearts because they know God exists but they hate Him. If atheists even want to say that the eye was just a random process, perhaps they should try making a camera without any proper blueprints. That way, they can easily convince me that life is just an accident better than just boycotting Christians from speaking about scientific facts.