Eye Function

Introduction:My project is how each part of the eye works.

How the eye functions

The best way to understand function of the eye is to compare it to a camera. A camera creates images by focusing on an object and allowing specific amounts of light to pass through a hole to create a visual impression on film. The eye functions in much the same way.

When light enters the eye, it passes through the cornea (camera lens) where 2/3 of focus is achieved. The light then passes through the pupil where the iris (aperture) adjusts the amount of light that is allowed to enter. The remaining 1/3 of focus is then achieved when the light passes through the lens (camera lens). The shape of the lens can adjust (either thinner or thicker) by tensing or relaxing the muscles of the eye. The focused light finally reaches the retina (film) where it is converted by the rods and cones into a signal that can travel to the brain (film development). Once the image reaches the brain, you have sight.

Materials:Flashlight,and eye model

Procedures:The eye model shows you how to produces a picture in the yellow spot and and where the blind spot is.When you make the eye longer, you could see that it is nearsighted and the picture has become unclear.So then you move the eye model closer it has become long-sighted and unclear.

Scientific Priciple:The shape of the eye and what you project to determine of what you see.

Saftey Regulation:Wear goggles