Parents in NSW are being urged to book their four-year-olds in for free eyesight testing so any vision problems can be detected before they start school.
More than 800,000 NSW preschoolers have benefited from a free screening program provided to four-year-olds since 2008.
On World Sight Day, Associate Professor Elisabeth Murphy, a senior clinical advisor to the NSW health department, urged more people to take advantage of the Statewide Eyesight Preschooler Screening program.
"Because children rarely complain of eye problems and often don't realise they can't see properly, the only way to tell if a child has vision problems is to have their eyesight tested one eye at a time," Associate Professor Murphy said in a statement on Thursday.
The program identified any vision problems early so children could receive appropriate treatment.
"The earlier the vision problem is detected, the better the chances of preventing permanent vision problems," she said.