Question

The decrease of the focal length of the eye-lens causes ______.

Answer 1

1. When the ciliary muscle contracts, the eye lens thickens and the focus length shortens.
2. It allows us to perceive items that are close by but not distant objects.
3. Myopia is caused by an excessive curvature of the eye lens, which affects the focal length of the eye lens.
4. Before reaching the retina, light from a distant object produces a picture.
5. This is due to the eyeball being too big or the cornea or crystalline lens being overly strong.
6. The focal length of the eye lens decreases.
7. As a result, the image forms in front of the retina rather than on its surface, it is called myopia or nearsightedness.