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Dark Mode vs. Light Mode: Which Is Better

Published by Slashdot on Mon, 17 Feb 2020


Recently a well-respected UI consulting firm (the Nielsen Norman Group) published their analysis of academic studies on the question of whether Dark Mode or Light Mode was better for reading'Cosima Piepenbrock and her colleagues at the Institut fr Experimentelle Psychologie in Dsseldorf, Germany studied two groups of adults with normal (or corrected-to-normal) vision: young adults (18 to 33 years old) and older adults (60 to 85 years old). None of the participants suffered from any eye diseases (e.g., cataract)... Their results showed that light mode won across all dimensions: irrespective of age, the positive contrast polarity was better for both visual-acuity tasks and for proofreading tasks... Another study, published in the journal Human Factors by the same research group, looked at how text size interacts with contrast polarity in a proofreading task. It found that the positive-polarity advantage increased linearly as the font size was decreased: namely, the smaller the font, the better it is for users to see the text in light mode. Interestingly, even though their performance was better in the light mode, participants in the study did not report any difference in their perception of text readability (e.g., their ability to focus on text) in light versus dark modewhich only reinforces the first rule of usability: don't listen to users... While dark mode may present some advantages for some low-vision usersin particular, those with cloudy ocular media such as cataract, the research evidence points in the direction of an advantage of positive polarity for normal-vision users. In other words, in users with normal vision, light mode leads to better performance most of the time... These findings are best explained by the fact that, with positive contrast polarity, there is more overall light and so the pupil contracts more. As a result, there are fewer spherical aberrations, greater depth of field, and overall better ability to focus on details without tiring the eyes... That being said, we strongly recommend that designers allow users to switch to dark mode if they want tofor three reasons: (1) there may be long-term effects associated with light mode; (2) some people with visual impairments will do better with dark mode; and (3) some users simply like dark mode better. The long-term effects associated with light mode come from an "intriguing" 2018 study they found which argued that reading white text from a black screen or tablet "may be a way to inhibit myopia, while conventional black text on white background may stimulate myopia..." The researchers wrote that myopia "is tightly linked to the educational status and is on the rise worldwide."Read more of this story at Slashdot.
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