English National Curriculum - Science
Mission Objectives
Describe the causes of long and short-sightedness
Explain how convex and concave lenses are used to correct vision defects
Compare different treatments for vision problems
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Words and meanings to learn
hyperopia (long-sightedness)
a condition where the eye is unable to focus on close objects because the lens focuses light behind the retina
concave lens
a lens that curves inward and diverges light rays, used to correct short-sightedness
cataract
a condition in which the lens of the eye becomes cloudy, preventing light from passing through clearly and causing blurred vision
convex lens
a lens that curves outward and converges light rays, used to correct long-sightedness
myopia (short-sightedness)
a condition where the eye is unable to focus on distant objects because the lens focuses light in front of the retina
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Mission assignment film
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