How do blind dolphins become blind?

No Dolphins are not blind. However they use sonar to judge what and where objects and other animals are from far away. They also use this same sonar to communicate with other dolphins.

yes,because these days kids and childern stare at the t.v too much or if you dont think that is true it is ok because every year your eye sight gets bad so you might want to get some new glasses

you eat popcorn...

There is so many ways but here are some. Cataract - its the opacity of the lens inside your eyes, opacity may be caused by UV radiation, diabetes, trauma, or mediacation / toxicity. Macular...

I know lots of people who are coulour blind, but that means that they can't see certain coulours like other people. But that doesn't mean that they become blind completly. Yes they can become coulour...