According to the Eyecare Trust - which has partnered with Boots to promote National Eye Week - many people do not realise they can get their sight tested without having to pay for it.
As good eye health is also linked to overall body health, they should take advantage of this, they stated.
Common complaints such as age-related macular degeneration, cataracts and glaucoma can be diagnosed and treated during an eye test.
Examining the eyes can also reveal underlying and sometimes unrecognised health problems - some of which are quite serious - including high cholesterol, high blood pressure and diabetes.
The under-16s and those people aged under 19 who are in full-time education can get a free test, as can people aged 60 or over.
People who are receiving state benefits also do not have to pay, or those who have glaucoma or increased risk of glaucoma, plus people who have diabetes.
Some people are also entitled to receive vouchers towards the cost of buying glasses or contact lenses.
People can also buy cheap contact lenses by ordering them online and could get extra savings by purchasing several packs at once.
by Martin Burns