2.87 understand the function of the eye in focusing near and distant objects, and in responding to changes in light intensity

Key Points
1. When light enters your eye, it passes through the cornea and lens, and then is focussed onto the retina. There are cells which are sensitive to light and these are called rods and cones.
2. When light stimulates them, they send information to the brain.
3. When you are looking at a distant object:
-Your ciliary muscles relax
-The suspensory ligaments tighten
-the lens becomes THIN, and the distant object is focussed.
4. When you are looking at a near object,
-Ciliary muscles contract
- Suspensory ligaments slack
-the lens becomes fat or thicker, and the near object is focussed.
5. The image which goes into the eye is actually inverted, but the brain corrects the inversion.