Drivers should have compulsory eye tests every 10 years, the Association of Optometrists has said.
One in three optometrists say they have seen patients in the last month who continue to drive with vision below the legal standard, their association said.
Motorists must read a number plate from 20m (65ft) in the practical driving test, but there is no follow-up check.
The Department for Transport said changes to eyesight should be reported by motorists to the DVLA.
"All drivers are required by law to make sure their eyesight is good enough to drive," a spokeswoman said.
Data from the Department for Transport shows seven people were killed and 63 were seriously injured in accidents on Britain's roads last year when "uncorrected, defective eyesight" was a contributory factor.
'Outdated laws'
Nine out of 10 optometrists believed the existing rule - that put the onus on motorists to report themselves to the DVLA if they develop eyesight problems - is insufficient.
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