Those are the exceptions to the rule. And even those can prevent you from a normal life. I could see the eyes affecting the ability to drive (or at least obtain a license), and if you aren't a swimmer, webbed feet or hands doesn't sound very fun.
Cel: I was only saying how people might have an advantage from those disorders. What if the man with webbed hands was a swimmer? He can still have an advantage. How about a runner who was born with long legs?