How do colored contact lenses work without tinting your vision?

I've always wondered how colored contact lenses work. Are they completely colored, or is there a clear spot in the center for the pupil?


If they are completely colored, wouldn't blue contact lenses tint your vision blue, like sunglasses? If there is a clear hole for the pupil, how does the fact the pupil changes size affect things? I would think when the pupil got really small you would see a small circle of the original eye color around it, and when it got big it would tint the edge of your vision.|||there is a clear hole in the center for your pupil, so you don;t see the color unless it slides over your pupil [like mine often does]


i wear colored contacts in four shades, and yeah, when my pupil gets smaller, you can see a slight ring of the original color but the color on the contacts sort of fades at the inside edges so it almost blends in with your natural color.





i found this on google, you can see the clear hole: http://www.discount-lenses.com/blog/wp-c鈥?/a>