Defects of Sight
Cards (13)
- Defects of Sight = Short-sightedness, Long-sightedness, Astigmatism
- Short-sightedness = myopia
- Long-sightedness = hypermetropia
- Short-sightedness = inability to see distant objects clearly because the light rays are focused in front of the retina
- Eye lens too thick
- Eyeball too long
- How to correct short-sightedness = concave lens
- Long-sightedness = inability to see near objects clearly because the image is focused behind the retina
- Eye lens too thin or eyeball too short
- Astigmatism = seeing part of an object clearer than the rest of the object
- Uneven curvature of the cornea or eye lens
- How to correct long-sightedness = convex lens
- How to correct astigmatism = cylindrical lenses