Moneysavingexpert Martin Lewis has said buying contact lenses online - rather than the high street - can save around £100 a year.
On his website, he said discount traders - such as websites - can sell their products cheaper because they buy in bulk from the supplier.
In addition, he noted after an eye test and fitting, opticians are "bound by law" to hand over a prescription, which can then be used to order contact lenses online.
Mr Lewis also recommended buying more than one pack at a time to save more money and beat the credit crunch.
"The longer the supply you buy, the cheaper - three, six or preferably 12 months is usual and order your new supply at least a month beforehand, to make sure they arrive on time," he wrote.
His advice came as part of a feature on things people could do to save their money in the current economic downturn.
by Adrian Galbreth