Correcting sight problems

Question 1

What is a way of correcting long and short sightedness?

Answer 1

Spectacles are a simple way of correcting these conditions

Question 2

State some advantages and disadvantages of wearing contact lenses

Answer 2

Advantages- contact lenses are safe when playing sport because they can not be knocked off or broken; and people may prefer not to wear glasses
Disadvantages- contact lenses must be kept very clean otherwise they can cause eye infections; some people find them uncomfortable to wear

Question 3

Laser surgery is an alternative to wearing glasses or contact lenses. Explain how laser treatment is used to correct problems like long and short sightedness

Answer 3

The patient is given a local anaesthetic. lasers are used to make small, precise cuts in the cornea. These permanently change the shape of the cornea. Shaping the cornea in this way can make it acts like a diverging or converging lens, as required by the patients condition.