Light and Sight EQ: How do we use our eyes to see?

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Presentation transcript:

Light and Sight EQ: How do we use our eyes to see?

Detecting Light Visible light – electromagnetic waves that our eyes can detect EQ: How do we use our eyes to see?

How Your Eye Works Muscles around the lens change the thickness of the lens so that objects can be seen in focus Rods – detect very dim light Cones-detect colors in bright light EQ: How do we use our eyes to see?

Common Vision Problems Nearsightedness –Occurs when light is not focused on the retina –Eye is too long, a person can only see things that are close to them Farsightedness –Occurs when light is not focused on the retina –Eye is too short and the person can only see things that are far away EQ: How do we use our eyes to see?

Color Deficiency About 5%-8% of men and 0.5% of women in the world have color deficiency Most cannot tell the difference between shades of red and green or can’t tell red and green apart EQ: How do we use our eyes to see?

Color Deficiency Cannot be corrected Occurs when cones and rods do not work properly Three cones are names for the colors they detect most-red, green or blue-but each can detect many colors EQ: How do we use our eyes to see?

Surgical Eye Correction Use lasers to reshape a person’s cornea Some dangers –Some patients report glares or double vision –Have trouble seeing at night –Can go blind EQ: How do we use our eyes to see?

Class Work and Homework EQ: How do we use our eyes to see? Fill in What did I learn Confused Say Make a diagram of the eye Read text online and answer Questions