
The sight test is the most important and effective way of ensuring your eyes are healthy. Everyone should have there eye tested at least once every 2 years irrespective of whether you wear glasses or not. There have been many occasions where I have tested someone with perfect sight who has had an eye health condition that needed treating. So actually the most important role of the sight test is to assess, professionally, the health and condition of your eyes. So even if you are 20/20 go and get them tested. http://www.healthyeyes.org.uk/index.php?id=4
All children under 16 are entitled to a free sight test on the NHS. There are many other people who are also entitled and don’t realise it. Follow this link to see who qualifies for an NHS test. http://www.twcsa.nhs.uk/how_to/sight_test.htm
If you are not entitled and pay for a ‘private’ test you can be tested as often as you want. Always choose a reputable Optician or one that has been recommended to you. If you want to buy glasses on-line or for instance reglaze with us you will have to have a prescription that is less than 2 years old.