1What is a defect of vision? Name its two types.
2Why do distant objects look blurred to a myopic person? Give two causes of myopia.
3How is short-sightedness corrected? Describe the path of the rays.
4Write four differences between myopia and hypermetropia.
5Why does an elderly person hold a newspaper at arm's length to read it? How is this corrected?
6Give the advantages and disadvantages of contact lenses compared with spectacles.
7What precautions should be taken when using contact lenses?
8How does laser eye surgery correct myopia and hypermetropia? What is LASIK?
9A student's far point is 3 m away. Which defect does the student have, which lens is needed, and roughly what should its focal length be?