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Why Does My Contact Lens Solution Evaporate Overnight?

Do you ever keep track of the amount of saline solution you use to soak your contact lens? If you do, you should notice the contact lens solution evaporates overnight. Have you ever wondered why and how is this happening?

Now that we have got your attention, read on to find out why it happens. There are some things you might really want to keep in mind as a contact lens user.

Estimated reading time: 6 minutes

The Whys To Evaporation Process of Contact Lens Solution

contact lens solution evaporated

Let’s face it. Liquid evaporation is inevitable. But why is this happening?

Just like any other liquid element, contact lens solution evaporates when the climate is dry or even when the humidity level is low. These conditions help the changing process from liquid to gas or vapour even quicker. While water evaporation is totally safe, it is another different story for contact lens solutions.

According to a study conducted by Abbot Laboratories, partial evaporation can affect the efficiency of multi-purpose solutions. It means that the leftover solution will not be able to disinfect, moisturize and store your contact lens properly.

Therefore, it is crucial that you always keep your contact lenses in enough solutions in your contact lens cases. Since we mentioned that liquid evaporation is unavoidable, how can we overcome this issue?

4 Precaution Steps That You Can Take To Avoid Evaporation Of Lens Solution

There are a number of ways to deal with this problem. Check out these four prevention methods to minimize the tendency of the contact lens solution from drying up.

1. Be sure to check for lifespan of your opened and unopened lenses.

Firstly, follow the suggested number of days of usage accordingly once you open and use your contact lens. For example, if it is a monthly lens, you can and should use it for 30 days regardless of how many times you have worn them. 

Did you know your unsealed contact lens also has expiry dates? Surprisingly, many wearers might not even know contact lens actually has a limited shelflife. The expiry date of a contact lens is usually four years from the manufacturing date. So, be sure to check on your contact lens packaging for the expiry date. 

Can you wear expired lenses? 

The answer is a strict no. After the expiry date, the contact lens packaging seal tends to degrade. This condition will cause contamination of the solution and the contact lens inside.  

Contaminated contact lenses can cause trouble such as eye infections. You don’t want to end up getting side effects by wearing expired contact lenses, do you? 

So, if you have an expired contact lens in your collection, throw that away immediately. You should never wear it in whatever condition. 

2. Make sure to change your contact lens case.

As an avid contact lens wearer, you should know how often you need to change your contact lens cases. Practically, you have to change your contact lens case at least every three months. However, it would be even better if you could change it every month. 

You may think you have already sanitized and cleaned the case. However, that is not true. In fact, the longer you use the case, the more bacteria can breed in it. An unclean contact lens case may cause it to infect your contact lens and also your eyes. 

Apart from changing the cases, you also need to check for the case condition. Make sure there is no breaking or cracking that may lead to leaking. Other than that, be sure that the caps are closed tightly to avoid spilling while storing your contact lens.   

3. Preventing the evaporation of contact lens solution.

To prevent your contact lens solution from evaporating, you may want to take extra precautions on how you store them. The best way you can do this is by keeping your lens in an appropriate contact lens case. Then, enclose it in a zipper bag. This way you can ensure that there is a barrier between your lens case and the direct open atmosphere.

Lower humidity levels and hot or dry temperatures can dry off the solution from the cases if you don’t close the case cap properly or let it lie in an open atmosphere. Alternatively, keep them in a protected lens kit if you do not have a zipper bag to store them in.

Some wearers usually top off their contact lens cases with fresh solutions. Topping off means you add a fresh solution to the used solution which is already in your contact lens case. Sounds familiar?

It might seem to be cost-effective and time-saving for some. However, this practice actually reduces the effectiveness of disinfection. Hence, it will lead to unwanted eye complications and infections.

4. Do not reuse contact lens in dried-out cases.

Your contact lens can get dried out if you store it in your case for too long. Remember that multi-purpose solutions can evaporate even stored in dedicated contact lens cases. So, if you leave your contact lens in the case for a longer period of time, you may find it in a dried-up condition with not even a single drop of solution left.

Never attempt saving and reusing the contact lens regardless it is still soft to your fingertips or completely dried up. Improper storage of contact lens may the risks of corneal abrasions and scratches.

Be sure to dispose of them right away to avoid continuous exposure to bacteria. Contact lenses are made in a form of thin discs of plastic or glass that sits directly on your cornea. Although contact lens feels like soft materials when we touch them, they could be quite sharp to the surface of your eyes when it dries up.


With all that being said, you should by now, understand why your contact lens solution evaporates and how you can overcome the problem.

Whatever your contact lens wearing routine is, you should always keep in mind that hygiene plays a huge part in keeping your eyes safe and healthy.

Play your part for a better vision. Take good care of your contact lens and your eyes.

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