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mayank jain

This document discusses common vision defects and how they can be corrected using lenses. Myopia, or near-sightedness, is corrected using concave lenses, while hypermetropia, or far-sightedness, is corrected using convex lenses. The document also notes differences in eye anatomy between various animals, such as crabs having small eyes that allow wide vision, and owls having large corneas and pupils to let in more light as well as more rod cells in their retinas compared to day birds.

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Defects of Vision Myopia (short- sightedness) can be corrected using concave lens Hypermetropia (long-sightedness) can be corrected using convex lens
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• Eyes of crab are small but it can look all around with those eyes. • The owl has a large cornea and a large pupil to allow more light in its eye. It’s retiŶa has ŵore rods thaŶ cones. The day birds have more cones and less rods.
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  • 8. Defects of Vision Myopia (short- sightedness) can be corrected using concave lens Hypermetropia (long-sightedness) can be corrected using convex lens
  • 10. • Eyes of crab are small but it can look all around with those eyes. • The owl has a large cornea and a large pupil to allow more light in its eye. It’s retiŶa has ŵore rods thaŶ cones. The day birds have more cones and less rods.