Mörkt läge är ett digitalt gränssnittsläge där text eller annan viktig information visas i ljusa färger mot en mörk bakgrund. Detta är i kontrast till ljust läge – mörk text på vit bakgrund – som ofta anses som standard. Läsförståelse är förmågan att få en förståelse av en text, och är viktig på grund av den stora användningen av skriftlig information i samhället samt för inhämtningen av ny kunskap. Denna förmåga är särskilt viktig för personer i högre former av utbildning, såsom universitet och högskolor. Denna studie undersöker mörkt läges effekt på läsförståelse. Effekten testades genom att låta deltagarna göra en kortare version av läsförståelsedelen av ett högskoleprov i både mörkt och ljust läge. Totalt deltog 15 personer, och alla var studenter från EECS – skolan för elektroteknik och datavetenskap – på KTH. Denna studie finner endast en obetydlig skillnad mellan läsförståelse i ljust eller mörkt läge, då till fördel för ljust läge. Det måste dock noteras att studien varit mycket liten när det gäller antalet testdeltagare, vilket innebär att resultaten inte är särskilt robusta och kan knappast generaliseras till andra grupper. / Dark mode is a display setting where text or other important information is displayed in light colors on a dark background. This is in contrast to light mode, where dark text is displayed on a white background, which is often considered to be the standard. Reading comprehension is the ability to gain a deeper understanding of a text, and is important for the utilization of written information in society as well as the acquisition of new knowledge. This ability is especially important for people in higher levels of education, such as universities and colleges. This study investigates the effect of dark mode on reading comprehension. The effect was tested by letting participants perform a shorter version of the reading comprehension part of an older Swedish Scholastic Aptitude Test in both dark and light mode. In total 15 people participated, and all were students from the School of Electrical Engineering and Computer Science at KTH. This study finds only an insignificant difference between reading comprehension in light or dark mode, with the difference being in favor of light mode. It should be noted that the study has been very small in regards to the number of participants, meaning that the results are not very robust and can hardly be generalized for other groups of people.

Dark mode, an increasingly popular design trend, is a user interface that uses light text and icons on a dark background. As most social media platforms have adopted this trend it’s important that the interface is also designed with usability in mind. Despite seniors' increasing use of social media their needs are often overlooked in the development of digital products compared to younger users. Seniors' needs and challenges often differ from those of younger users, which emphasizes the importance of adapting technology and design to also meet their needs. By understanding how dark mode affects usability for senior users, developers and designers can create user interfaces that meet the needs of a wider audience. This study therefore examines how dark mode may affect the usability for senior social media users, using Facebook as a case. A survey was conducted based on the five quality components of usability: learnability, efficiency, recognizability, error and satisfaction. The result shows that the respondents had a generally negative attitude towards the usability of dark mode on social media regarding all five usability components. We propose a bigger clarity in how to switch to and from dark mode so that seniors easily themselves can choose which mode they prefer to use.