Apple's Tier 1 Advisor Practice Exam

Using 'Dark Mode' in iOS is primarily significant for its ability to reduce eye strain in low-light environments. This feature alters the user interface to display darker colors, which not only minimizes the amount of light emitted by the screen but also makes it more comfortable to use the device in dim settings. The softer light from a dark-themed interface can be less harsh on the eyes, making it easier to read and interact with content, especially for extended periods. This is particularly useful in situations like nighttime use or in darker rooms, where bright screens can cause discomfort or even disrupt sleep patterns due to the blue light emitted.

While other options provide additional benefits related to accessibility and potential impacts on visual media, they do not capture the primary purpose of 'Dark Mode' as effectively as its role in reducing eye strain. Specifically, enhancing color contrast can be beneficial for some users, but it relates more to visual clarity and not specifically to the low-light context that 'Dark Mode' aims to address. Similarly, video playback quality and gaming performance are not directly linked to the primary design intention of 'Dark Mode', which focuses on user comfort and health in specific lighting conditions.