This can sometimes happen when you forget to keep the contact lenses moist. What happens is your eye is already moistened - when you place something dry (such as non-moistened contact lenses) into the eye, it can form a "dry-seal" which makes it harder to remove.
A more relative experience to this can be - X-mas decorations. When you get window clings you must lick one side to make them stick to the dry surface (window). Removing them is the same as removing a "dry-sealed" contact lense.
Lastly to correct this problem is simple. If your contacts are one time use - throw them away. If they are multiple use then place them back into your small contact case and moisten them using the saline solution your Opthamologist prescribed.
The lens is posterior to the iris in the eye.
Where your iris and pupil are on your eye, there is a slight round bump, as shown in this picture: http://www.retinaaustralia.com.au/images/eye6.gif A contact lens is shaped precisely to the size and shape of that bump, so that when you place a contact lens in your eye, the contact lens tries to find the place that it fits around perfectly, which is over your pupil and iris.
The iris surrounds the lens.
The iris acts like the aperture of a camera lens.
My dad is an eye doctor and the same thing happened to me... you should just wash it out well with your lens solution and it'll be fine.
Anterior
The colored part of the eye is the Iris.
iris and ciliary muscle
iris
Lens does not belong, as it is not part of the structures involved in the formation or regulation of the aqueous humor within the eye like the ciliary body, iris, and suspensory ligaments.
The colored part of the eye is called the iris. The black dot in the middle is the pupil which is covered by the lens.
The structure that anchors the lens in place between the choroid and the iris is the ciliary body. It consists of ciliary muscles and ciliary processes which hold the lens in position and facilitate changes in its shape for focusing on near and distant objects.