Contact lens replacement schedule: how often to change each type

Replacement schedules at a glance

Every soft contact lens is approved for a specific replacement interval. The number is printed on the box and on the prescription your eye doctor gives you. The common schedules look like this:

Lens type	Replace after	Cleaning between wears
Daily disposable	One day of wear	None, the lens goes in the bin
Weekly	7 days	Rub, rinse and store in fresh solution every night
Two-week (biweekly)	14 days	Rub, rinse and store in fresh solution every night
Monthly	30 days	Rub, rinse and store in fresh solution every night
Quarterly, six-month, yearly	90, 180 or 365 days	Strict nightly cleaning; often used for specialty or tinted lenses

Rigid gas permeable (RGP) and scleral lenses follow their own schedules, often a year or more. Your eye doctor sets those individually.

When does the clock start?

This is the most common point of confusion on forums like r/contacts. The short answer: for most reusable soft lenses, the countdown starts on the day you open the blister, not after a certain number of wears. Bausch + Lomb, for example, describes its monthly lenses as worn each day, cleaned each night and used "for up to 30 days", and says unworn lenses can sit in the case for a maximum of 30 days as well.

The reason is the material. Once a lens has been in your eye and in solution, it collects protein and lipid deposits and slowly loses the properties it was designed with. Skipping a few days of wear does not pause that. So a pair of monthlies opened on March 3 is due on April 2, even if you wore glasses for a week in between. If your lens instructions say something different, follow them.

Why stretching the schedule is risky

Most people who overwear lenses are not reckless. They lose track of the date, or the lenses still feel fine, so another week seems harmless. It is extremely common: in a 2015 CDC survey of about 1,000 US wearers, 49.9% admitted extending the recommended replacement frequency of their lenses, and 82.3% did the same with their lens case. The American Optometric Association has reported that 59% of wearers keep disposable lenses longer than they should.

The problem is that comfort lags behind the risk. Deposits reduce how much oxygen gets through the lens and give bacteria something to cling to. According to the CDC, there are nearly one million US health care visits a year for keratitis or contact lens complications. A lens that feels fine on day 40 can still be the one that ends with a red, painful eye and a course of antibiotic drops.

• Daily lenses are designed for a single wear. Putting one back in after a night in solution is not a smaller version of a monthly; it is a lens that was never meant to be disinfected.
• Two-week lenses are the easiest to stretch, because 14 days pass quickly and the box often holds six pairs. Many wearers drift to three or four weeks without noticing.
• Monthlies are easy to lose track of because "the start of the month" is rarely the day you actually opened them.

How to actually stick to the schedule

Write the date down the moment you open a pair

The single most useful habit. Use whatever you will see again: the lens case lid, a note on the bathroom mirror, a calendar event, or an app. What matters is that the date is recorded at the moment of opening, not reconstructed from memory two weeks later.

Line up the schedule with something regular

Some wearers of monthlies start every new pair on the 1st. That works if you are disciplined about it, but it means either throwing away days or wearing an old pair to the 1st. A reminder tied to the actual opening date is more honest.

Track each eye if your prescriptions differ

If your left and right lenses have different powers, it is common to tear a lens or lose one and replace only that side. From then on, the two eyes are on different dates. One shared countdown no longer works.

Change the case and solution on their own schedules

The lenses are only part of the system. The FDA advises replacing the storage case every 3 months or as your eye care professional directs, and never using solution past its expiration or discard date. We cover that in a separate guide on how often to replace your contact lens case.

Keep a spare pair and watch the box

Overwearing often happens because the box is empty and the new order has not arrived. Count what is left and reorder while you still have at least one or two replacement cycles in stock.

What if you already went past the date?

If you have just noticed that your lenses are overdue and your eyes feel normal, take them out and start a fresh pair. Do not try to "finish the week". If you notice redness, pain, light sensitivity, discharge or blurred vision, remove the lenses, do not put in a new pair, and contact an eye care professional promptly. Those can be signs of an infection that needs treatment.

This article is general information and does not replace advice from your optometrist or ophthalmologist, or the instructions that come with your lenses.

A simple way to never guess again

We built Wink for exactly this problem. You pick your schedule (daily, weekly, two-week, monthly, quarterly, six-month, yearly or a custom number of days), tap "Replaced today" when you open a new pair, and the home screen shows one big number: days left. Wink sends a heads-up a few days before, a reminder on the day and a nudge if you are late. With Wink Pro you can track the left and right eye separately, follow your solution and lens case, and keep count of the lenses left in the box.