But really think about it, and now think that there could be things in the Universe just like light which we simply do not have organs to perceive. How can we understand it?
Every thing that exists leaves some sort of trace or has some sort of effect on something else.
Take light for example: Without eyes, we would still know that it exists.
Why? Because when the photons impact atoms, it can be released as heat. We would discover the heat and ask why it was there. We would eventually discover light even without eyes.
Would we understand light in the same way as we understand it now if we had no eyes? Maybe not... but maybe our eyes limit our understanding of light in ways that a being with no eyes would not experience.
We could always ask someone who was born blind...