Vision is an absolute marvel of Divine Engineering.
It requires a minimum of 3 systems working together from the start, or we don't see.
1. Eyes to capture light & convert into signals
2. Pathways to transport the signal
3. A brain to process it
Evolution can't build it one step at a time, because there is no vision until all those systems exist and function together.
Compounding the complexity further, each of those 3 systems themselves require a minimum number of more complex subsystems to function properly.
For instance, all eyes require opsin proteins.
Opsin is a highly complex protein that holds a special light-sensitive molecule called retinal; when a single photon hits the retinal, it instantly flips shape, triggering the opsin to change its 3D shape and trigger a precise cascade which converts the light into an electrical signal to be sent to the brain where it can be understood as vision.
Opsin alone, is useless. It needs the retinal molecule plus the full cascade, or it does nothing.
This is the case with ALL vision systems, confirmed over and over again the lab.
No partially formed system produces any vision, or any other function for that matter.
Many uninformed Evolutionists attempt to argue that we see different levels of complexity in vision systems, which they say is evidence that vision evolved gradually from simpler systems.
But the evolutionary scientists themselves refute this.
Even the very simplest possible system of vision - the infamous "light sensitive cell" - still relies on a similar highly complex, interconnected network of proteins and other molecules.
Mainstream evolutionary science even teaches that vision systems evolved independently, from scratch, at least 40 different times.
The reason is because many vision systems are so different, operating with such unique parts, that one simply could not have evolved from another.
The fossil record itself refutes the concept of step by step construction of vision systems.
Complex eyes appear early in the fossil record, fully formed & functional.
There is no increasing complexity in the fossil record - it's a complete contradiction of evolutionary predictions.
The vision system has all the Hallmark evidence of design.
A complex, interconnected web of information processing systems with incomprehensibly precise timing & coordination between them all to produce a highly specialized function.
Nature does not, and cannot, produce such a system, not with all the time and resources in the entire universe.
Everything you see is a testament to the Power of our Creator.