Eyes that look healthy could still conceal an underlying condition and it is important that people look after them, according to the Royal National Institute of Blind People (RNIB).
It notes on its website that sight-threatening conditions, such as glaucoma, have no symptoms and can cause people to lose up to 40 per cent of their sight before something is detected.
An eye test could pick up these conditions and save people"s sight, so regular eye examinations - at least once every two years - are vital.
Some behaviours and habits can affect the health of the eyes - such as smoking, which can double the risk of age-related mascular degeneration.
Sunlight contains harmful rays so eyes should be protected by glasses or special contact lenses - check for those with a British Standard, such as Purevision contact lenses.
Healthy eating and keeping fit are also ways of keeping eyes in tip-top condition - especially foods such as oranges, kiwi fruits, broccoli and oily fish - the latter which contains high amounts of omega 3 oils.
by Alexa Kaczka