Defects of Vision

Myopia (short-sightedness) can

be corrected using concave lens

Hypermetropia (long-sightedness) can be corrected using convex lens

• 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 retina has more rods than cones. The day birds have more cones and less rods.