How dangerous are contacts?

Very Safe. When properly fitted by a professional and used according to the recommendations -- extremely safe. I have been wearing "hard" lenses (gas permeable) for 46 years without a problem. Rest of family similar experience, many patients -- same result. They can greatly improve the convenience factor of vision. Good Luck.
Contact Lens Risks. Including eye infections and corneal ulcers. While most people can wear contact lenses, not all lens types are appropriate for everyone. Your ophthalmologist can help you decide which type of lens is right for you.