Either way they cannot and should not be ignored. They don't see the big picture. Too many times I feel parents are patronized when they express their concerns or ask questions. Professionals in the small field of vision impairments are immersed in the world of blindness. They tend to forget sometimes that parents don't know the basics.
Most parents have little, if any, experience with blindness.
Often they are too scared to think about their child becoming an adult. But these parents are just like us. We all need dreams, even unrealistic ones, to motivate and challenge us each day. I'm sure I am not the only parent who told her children they could be rocket scientists. I have also been known to buy a lottery ticket or two, even though the odds of winning are ridiculous.