Permanent dark mode may not be good for the eyes

The dark mode of the Play Store reaches mobile phones with Android 9 Pie

The dark mode has been gaining a lot of presence for over a year in the market. Android and the customization layers are incorporating it, something that also moves to applications (Google has been introducing it in most of its applications already). So it has become very familiar and that we probably use on a day-to-day basis.

One of the most used arguments when speaking in the dark way is that this mode is less aggressive to the eyes. It allows to read the screen better in many situations, generating a minor impact on the eyes of the users. To what extent is this argument really true? Luckily, we already have some answers.

Why is it good to use dark mode?

The dark mode of the Play Store reaches mobile phones with Android 9 Pie

There are a number of arguments in favor of using dark mode on Android These are arguments that we have been hearing for a long time, but that are true and justify that both manufacturers and Google are promoting the use of this mode in phones and applications in general. What main advantages does it have?

Energy saving

This mode is ideal for OLED and AMOLED screens, in which each pixel works independently. In these cases, since each pixel is independent, if the screen is mostly black, the pixel is off, preventing it from consuming energy. You get a lower power consumption of the screen, which is precisely the part of a smartphone that consumes more energy.

Unfortunately this it is not something that users with an LCD panel benefit from. So it is an advantage for a specific group of users. Although the amount of OLED and AMOLED panels on the market increases with the passage of time, so more and more users benefit from this dark way.

Less impact on the eyes

Android blue light filter

This is a well known argument: Dark mode reduces the impact of blue light, and the negative effects it can have for users. It acts as a filter in some way in this case, which allows a more comfortable use of the phone, also reducing the impact that the phone screen has on the eyes.

Various studies have been conducted on the impact blue light has About people. One of them is Harvard Health, which showed that excessive exposure to blue light can mean that the secretion of melatonin is reduced, which is a hormone of great importance to be able to sleep properly at night. Although this is something that has to be given in large quantities, excessive exposure.

Reading facility

Related to the previous point is the argument that allows read more easily what you see on the screen. Especially on occasions as if the sun is giving directly to the screen, the dark mode can make it much more comfortable to read everything. Although this is something that also depends on each person, it is not something on which everyone agrees completely.

Why not use or it is not recommended to use the dark mode?

Xiaomi adds dark mode to its file manager

Just as there are a number of arguments in favor of this dark mode on Android, we also find certain arguments that make us see that maybe it's not as beneficial as it is argued. Especially in the field that is beneficial to the eyes of users we can see that new studies show that it is not as it was thought.

If you have astigmatism

Many people, surely many of you too, have astigmatism. According to various studies, about 30 of the population suffers from this condition, to varying degrees. Due to this problem, people can see blurry, because one of the eyes (or both in some cases) has an irregular shape. This makes it difficult for some people to read in dark backgrounds. Therefore, the dark mode would be just harmful to them.

Another 2014 study stated that people with astigmatism experience more difficulties when reading about a black or dark background, compared to a light background. This is something that has to do with the light levels, since a clear screen with a white background causes the iris to close a little more, allowing the deformation effect to be reduced. While if a dark black background is used, the iris receives more light and the deformation of the lens creates a more blurry effect.

If your eyes get used

This is an effect called Brightburn in English. If you get used to or use your eyes to use the dark mode on your phone for a while (weeks or months), when you use a screen that does not have such a mode, you will probably go to notice some discomfort and it might even be annoying in the eyes. It takes time to get used to that screen again.

This is normal, in the end, when a certain mode is used (either light or dark), it may later be difficult to adapt to the other mode. So it might be convenient do not abuse the use of such dark mode on Android, or use it only at certain times of the day, so that something like this does not happen.


A dark text on a white background makes reading a text easier, in addition to understanding it. It also helps to be able to retain or memorize more easily what we are reading. When we look at a screen with a white background, the iris does not have to be opened anymore, which allows us to focus better on that text.

As we mentioned above, in the case of the dark mode with a black or dark background, the pupil has to expand. Therefore, a greater effort has to be made to read the screen, which finally makes it less easy to read the text therein. By having to make more effort to read correctly, it is prevented that we will remember that text better or concentrate.