Seeing isn't the issue, knowledge is. When there is an object there are 5 ways we can gain knowledge about it which can be 100 different things for just a single thing. Instruments allow us to see that they are really vibrating at a certain frequency causing certain color to hit us. Other instruments can help us see the heat of an object, invisible chemicals, sound waves, cells etc., and we know all these things through forms of observation, none of which is wrong. The more knowledge we can gain the better our understanding. How much knowledge makes a person realized? The only criteria is knowing what we see is not as it appears, science pretty much confirmed that for everyone that we can see it with our own eyes. We know most everything is mostly empty space, we know, our bodies are something like 99% empty space but there are forces involved.