they both can see very far or very close and both can see things
The iris acts like the aperture of a camera lens.
If you have photographic memory then your eye functions like a camera in a way
Actually, the lens on your eye moves just like the lens of a camera to focus light. People who are nearsighted or farsighted have trouble focusing on objects that are very close or very far away. Since the lens on your eye isn't as big as the lens on a camera, it's just harder to observe it moving.
The aperature can control the amount of light that comes into the camera just like the pupil of the eye.
focusing lens of the eye....
A camera eye is an eye with a crystalline lens that focuses light. It is found in squid, octopi, and vertebrates. This is similar to the lens arrangement of a camera.
The focusing lens of the camera
a lens
In a camera the following parts could be considered equivalent to the parts of a human eye:Optical diaphragm = IrisAperture in optical diaphragm = PupilOuter lens element / lens glass = CorneaInner lens element = Eye lensCCD Sensor (in a digital camera) = RetinaThis is a huge simplification of a very complex topic. Please see the related links for more information.
the lens
Yes it is a convex lens just like the one in your eye! A convex lens goes outwards but a concave lens goes inwards (like a cave). Simple! :-) xoxo
iris