Week 9: Seeing Light CHAPTER 4, SECTION 4 Page 125 – 128.

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Presentation transcript:

Week 9: Seeing Light CHAPTER 4, SECTION 4 Page 125 – 128

The Human Eye Your eyes allow you to _SENSE_ light. You see objects when a process occurs that involves both your _EYES_ and your __BRAIN__.

Light Enters the Eye The transparent front surface of the eye is called the _CORNEA_. The _PUPIL_ is an opening through which light enters the inside of the eye. To get more light the pupil becomes _LARGER_, in less light the pupil _SMALLER_. The iris is a ring of _MUSCLE_ that contracts and expands the size of the pupil. The _IRIS_ gives the eye color.

An Image Forms The lens in the eye is a _CONVEX_ lens. The _RETINA_ is a layer of cells that lines the inside of the eyeball. Light-sensitive cells are called _RODS_. Rods allow you to see different amounts of _LIGHT_. Cones allow you to see _COLOR_. BrainPop- Eyes (3:46)

A Signal Goes to the Brain The short, thick nerve that connects the eyeball to the brain is called the _OPTIC NERVE_. The Optic Nerve begins at the _BLIND SPOT_. Close your left eye and look at the circle. Move your head and you will find your blind spot by not seeing the +

Correcting Vision To correct vision problems people wear _GLASSES_ and _CONTACTS_. _CONCAVE_ lenses to correct nearsightedness. __CONVEX_ lenses to correct farsightedness. A nearsighted person can see objects _NEARBY_, but distance objects are __BLURRY__. A farsighted person can see _FAR AWAY_ objects, but nearby objects are _BLURRY_. BrainPop – Vision Problems (3:24)