Yes.
You must wash your contact lenses in approved cleaning solution. If you want to lose your contact lenses forever, you can put them in the dishwasher and try it out.
Yes They Are.
Many people are not aware about diseases caused by lenses. You can see article about it. http://ezinearticles.com/?Soft-Contact-Lenses---Are-They-Safe?&id=35588 it is really helpful! Also try http://namebrandcontactlens.com/ to purchase cheap contact lenses. if you are in Canada or US.
Contact lenses can be safe as long as the proper steps are followed. There is an article within blog.contactlensking.com/index.php?category=safety titled "Contact Lens Compliance, Necessary for Eye Health" that provides instructions and advice regarding how to safely use contact lenses. I believe this article can provide critical information regarding contact lenses and eye health.
Yes, it's completely safe to buy discount contact lenses but do it through a reputable site. I myself have purchased from 1-800-contacts and had no problems with them.
Under most circumstances, yes. There are millions of contact lens users in the world.
I'm not sure why it wouldn't be.
Yes i think you do because contact lenses are a medical device even if it is just to change your eye colour. If you are going to be selling contacts to people then you need their eye measurements so you have contacts that fit there eyes properly to avoid injury of the eye.
The general answer is no, unless you have contact lenses specifically approved to wear overnight. You will not suffer any consquences dozing off wearing your lenses occasionally but the main reason you would not want to make that a habit is because the lenses restrict the flow of oxygen to the surface of your eye and the longer you wear the lenses, the longer the flow of oxygen is restricted.
They may pose a problem when swimming, but otherwise they pose no problems.
There is no permanent way, but colored contact lenses are a safe way to experiment with different colors