Never forget to change your contact lenses

It depends on the replacement schedule: daily lenses are replaced every day, two-week lenses after 14 days, monthly lenses after 30 days and quarterly lenses after 90 days. The countdown starts when you open the blister pack, not by the number of days you actually wore them. Check the manufacturer’s instructions for your exact schedule. LensPing counts the days for you and reminds you when it’s time for a new pair.

Two-week (biweekly) contacts are worn for 14 days from the moment you open the pack, even if you didn’t wear them every day. Take them out at night and store them in a case with fresh solution. Wearing them past their schedule lets deposits build up on the lenses and raises the risk of irritation.

No. Daily lenses are designed for a single use: they aren’t meant to be disinfected or stored in solution, so wearing them again increases the risk of infection. Throw them away at night and put in a fresh pair in the morning. LensPing tracks how many lenses you have left and reminds you to reorder in advance.

Most people are advised to wear contacts for no more than 8–12 hours a day, and less during the first few days, gradually increasing the time. Your eye doctor can tell you the right limit for your lenses. Wearing contacts around the clock, including overnight, is only okay if your lenses are approved for extended wear.

Usually not, even for a short nap: your eyes get less oxygen while you sleep, which raises the risk of inflammation. The exception is extended-wear lenses, and only if your eye doctor approves. If you fall asleep in your contacts by accident, take them out when you wake up and give your eyes a rest.

Overworn lenses let less oxygen through and collect deposits. This can cause dryness, redness, irritation and, in serious cases, inflammation of the cornea. If your eyes feel uncomfortable, take the lenses out and see an eye doctor. LensPing reminders help you never miss a replacement date.

Use fresh solution every time you store your lenses: never top off or reuse old solution. Replace the case itself at least every three months, and don’t rinse it with tap water.

Contact lens wearers are usually advised to get an eye exam once a year, or more often if your eye doctor recommends it. In the US, contact lens prescriptions are typically valid for one year. With LensPing you can schedule your next visit with a reminder, save your prescription after each exam and see how your vision changes on a chart.

LensPing is free and has no ads. No account is required: use guest mode, or sign in with Apple to move your data to another iPhone.

On your phone. The app works offline and syncs your data in the background. You can delete your account and all your data in Settings.

Not yet — LensPing is currently available for iPhone only.