How long can you wear contact lenses?

Around 10 to 12 hours, for one day only. Throw them away after wearing; never reuse daily disposables. 

You can wear them for up to 30 days from opening, but they must be cleaned and stored in solution every night, not worn continuously. 

Only in silicone hydrogel lenses specifically approved for extended or continuous wear, and only with your optometrist's sign-off. Sleeping in daily or standard monthly lenses raises your infection risk. 

Wearing lenses beyond their recommended time reduces oxygen flow to the cornea, which can cause dryness, discomfort and, in more serious cases, keratitis or corneal ulcers. 

Watch for dry, gritty eyes, redness, blurry vision or reduced comfort compared to normal. Any of these means it's time to remove your lenses and speak to your optometrist. 

Replace it regularly, generally every one to three months, and always clean it with fresh solution rather than tap water. 

Unopened daily and monthly contact lenses typically last two to four years in their sealed blister pack. Once you open a pack, follow the wear times above: one day for dailies, up to 30 days for monthlies. 

Some are approved for up to 30 days of continuous wear, but not every eye tolerates this well. Always check with your optometrist first.