Dark Mode and Web Accessibility

A Comprehensive Guide

Light Out, Comfort In

Dark mode has become increasingly popular in recent years, with many websites and apps offering the option to switch from a traditional light background to a dark one. While some users simply prefer the aesthetic of dark mode, there are also a number of accessibility benefits that make it a valuable option for many people.

Benefits of Dark Mode

For Accessibility

Reduced eye strain

Dark mode can help to reduce eye strain, especially in low-light environments. This is because the bright white light emitted from traditional screens can be harsh on the eyes, while dark mode creates a more comfortable viewing experience.

Improved contrast

Dark mode can also improve contrast, making it easier to read text and other content. This is especially beneficial for people with visual impairments, such as low vision or cataracts.

Reduced glare

Dark mode can help to reduce glare, which can be a problem for people with light sensitivity. This is because dark mode reflects less light, making it easier to see the screen without being distracted by reflections.

In Addition to the Benefits listed Above,

Dark Mode can also:

Improve sleep quality

Dark mode can help to suppress the production of melatonin, a hormone that regulates sleep. This can be beneficial for people who have difficulty sleeping, especially those who use their computers or other devices in the evening.

Extend battery life

Dark mode can use less battery power than light mode, especially on OLED screens. This can be beneficial for people who use their laptops or tablets on the go.

Users with Astigmatism


A Closer Look

While dark mode can be beneficial for many people with visual impairments, it is important to note that it may not be suitable for everyone. In particular, people with astigmatism may find that dark mode makes their symptoms worse. This is because astigmatism causes light to focus unevenly on the retina, which can be exacerbated by the contrast of dark mode.

If you have astigmatism, you may want to experiment with different font sizes, line spacing, and color combinations to find a setting that is comfortable for you. You may also want to consider using a light mode theme instead of dark mode.

Overall, dark mode can be a valuable accessibility feature for many people. However, it is important to consider your individual needs and preferences when deciding whether or not to use it.


Finding the Right Balance

Accessibility and Comfort

As we've discussed, dark mode can be a valuable accessibility tool for many people, but it's important to consider individual needs, especially for those with visual impairments like astigmatism. Astigmatism occurs when the cornea or lens of the eye has an irregular curvature, causing light to focus unevenly on the retina, resulting in blurry or distorted vision.

For people with astigmatism, the high contrast between dark text and a bright background can exacerbate these visual distortions. The stark contrast can make it difficult to focus on the text, leading to eye strain, headaches, and fatigue.

To address these challenges, consider adjusting the contrast ratio between the text and background in dark mode settings. A lower contrast ratio can help reduce the strain on your eyes and make the text easier to read. Many websites and apps offer options to customize the contrast ratio, allowing you to find a setting that suits your comfort level.

Here are some additional tips for reducing eye strain when using dark mode with astigmatism:

Increase font size

Larger font sizes can make the text easier to see and reduce the need to strain your eyes.

Adjust line spacing

Increasing the space between lines of text can improve readability and reduce eye fatigue.

Choose a soft, non-distracting font

Avoid fonts with sharp edges or complex designs, as these can be more difficult to read for people with astigmatism.

Take breaks

Regularly give your eyes a break from the screen to prevent eyestrain and headaches.

Additional Tips

Remember, finding the right balance between dark mode settings and your visual needs may take some experimentation. Don't hesitate to adjust the contrast, font size, and other settings until you find a combination that works best for you.

By following these tips and adjusting the settings to your individual needs, you can enjoy the benefits of dark mode while minimizing the impact of astigmatism on your reading experience.

Reading Mode

An Optimized Reading Experience

A Perfect Combination

In addition to the accessibility benefits already discussed, dark mode offers an additional advantage for reading online articles: Reading Mode. Several platforms, including the popular Firefox browser, integrate a Reading Mode that utilizes the principles of dark mode to create an optimized reading environment.

Reading Mode typically darkens the page background, removes images and other distracting elements, and adjusts the contrast and font for better readability. This minimalist environment reduces eye strain and improves focus on the text, making it ideal for extended reading of articles, posts, or digital books.

How Reading Mode Works

Reading Mode takes advantage of dark mode principles to create a more comfortable and engaging reading experience. Here are some of the ways dark mode is applied in Reading Mode:

Dark background

A dark background reduces light emission from the display, minimizing eye strain, especially in low-light environments.

High contrast

High contrast between text and background improves readability, making the text sharper and more distinguishable.

Customizable fonts

Reading Mode often allows you to customize the font, choosing from different typography options and sizes to optimize reading.

Distraction removal

Reading Mode removes non-essential elements such as images, ads, and navigation bars, reducing visual distractions and allowing you to focus on the text.

Benefits of Reading Mode with Dark Mode

The combination of Reading Mode and dark mode offers numerous advantages for online reading:

Reduces eye strain

The dark background and high contrast minimize eye strain, making reading more comfortable for extended sessions.

Improves focus

Removing visual distractions and presenting the text in a minimalist way helps maintain focus and comprehension of the content.

Personalized reading

The ability to customize font, size, and spacing allows you to optimize the reading experience for your visual needs.

Accessibility for all

Reading Mode with dark mode is particularly useful for people with visual impairments or light sensitivity, improving the accessibility of online content.


Reading Mode, in combination with dark mode, is a powerful tool for optimizing the online reading experience. By providing a minimalist, customizable, and accessible reading environment, Reading Mode with dark mode allows you to read articles, posts, and digital books with greater comfort, focus, and enjoyment.

If you are an avid reader of online content, I encourage you to try Reading Mode with dark mode to discover its benefits and enhance your reading experience.

Respecting System and Browser Preferences

The Importance of Light and Dark Mode Options

Benefits of Providing Light and Dark Mode Options

While dark mode offers many advantages, it's crucial to approach its implementation with a user-centric mindset. Forcing users into a single mode, whether light or dark, can override their system or browser preferences and potentially hinder their experience.

A more considerate approach involves respecting user choices and providing both light and dark mode options within each website or app. This allows users to seamlessly switch between modes based on their personal preferences and environmental conditions.

User Preference and Comfort

Users should have the autonomy to choose the mode that aligns with their visual comfort and personal taste. Some may prefer the contrast and brightness of light mode, while others may find dark mode more relaxing and suitable for low-light environments.


Dark mode can significantly benefit users with visual impairments or sensitivities to light. However, some users with visual conditions may find light mode more suitable. Providing both options ensures accessibility for a wider range of users.

System and Browser Integration

Respecting system and browser preferences fosters a consistent and intuitive user experience. When a user has chosen a system-wide or browser-specific mode, websites and apps should adhere to that preference unless the user explicitly overrides it within the app or website settings.

Environmental Awareness

Dark mode can reduce power consumption on devices with OLED screens, contributing to energy conservation. However, it's important to note that the impact on overall energy usage is relatively small. Providing both modes allows users to make informed choices based on their preferences and environmental considerations.

Implementing Light and Dark Mode Options


User-Friendly Settings

Provide clear and easily accessible settings for users to switch between light and dark modes. Consider placing the option in a prominent location, such as the header or menu bar.

Intelligent Mode Switching

Implement intelligent mode switching that detects the user's system or browser preference and applies the corresponding mode by default. Allow users to override this default and choose their preferred mode within the app or website settings.

Consistent Design and Functionality

Ensure that both light and dark mode versions of the website or app offer consistent design elements, functionality, and user experience. Avoid introducing significant visual or usability differences between the modes.

Thorough Testing

Conduct thorough testing on both light and dark mode versions to identify and address any potential usability issues, visual inconsistencies, or accessibility barriers.


By providing both light and dark mode options and respecting user preferences, websites and apps can create a more inclusive, accessible, and user-friendly experience. This approach empowers users to choose the mode that best suits their needs and preferences, ensuring a comfortable and enjoyable experience across diverse environments and devices.