Do blue-light blocking corrective lenses reduce symptoms of digital eye strain, including dry eyes and asthenopia, associated with prolonged screen use?

From the Guidelines

Blue-light blockers in corrective lenses are unlikely to reduce symptoms related to high screen use such as dry eyes and eye strain, as evidenced by low certainty evidence suggesting their ineffectiveness in reducing symptoms of visual fatigue. The most recent and highest quality study, a systematic review and meta-analysis published in 2022 in the journal Ophthalmology 1, found that blue light-blocking lenses were ineffective in reducing symptoms of visual fatigue. This study highlights the importance of considering the quality of evidence when making recommendations for managing computer vision syndrome (CVS).

When considering ways to reduce symptoms related to high screen use, it's essential to focus on evidence-based methods. Some strategies that may help alleviate digital eye strain include:

• Following the 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds
• Using artificial tears for dry eyes as needed
• Ensuring proper screen positioning (arm's length away, slightly below eye level)
• Maintaining proper lighting in the workspace to reduce glare

It's also important to note that the primary causes of digital eye strain are likely reduced blinking when using screens and poor ergonomics, rather than blue light emission alone. If you're experiencing persistent eye discomfort, it's best to consult an eye care professional for personalized recommendations rather than relying solely on blue-light blocking technology. The use of omega-3 fatty acid supplementation may have a possible role in managing dry eyes symptoms associated with CVS, as suggested by the same systematic review and meta-analysis 1. However, the evidence for this is still considered low certainty, and more research is needed to fully understand its effectiveness.

From the Research

Effectiveness of Blue-Light Blockers

• The use of blue-light blockers in corrective lenses has been studied for its potential to reduce symptoms related to high screen use, such as dry eyes and eye strain 2, 3, 4.
• Research suggests that blue-light blockers may not be effective in reducing eye strain or improving sleep quality 2, 3, 5.
• A double-blind test of blue-blocking filters on symptoms of digital eye strain found no significant difference in symptoms between the blue-blocking filter lens and the control lens 2.
• A double-masked randomized controlled trial also found that blue-blocking lenses did not alter signs or symptoms of eye strain with computer use relative to standard clear lenses 3.

Alternative Management Strategies

• Management of digital eye strain may involve a holistic approach, including appropriate correction of refractive error, management of vergence anomalies, blinking exercises, and use of lubricating eye drops 6.
• Prevention is the main strategy for management of digital eye strain, which involves ensuring an ergonomic work environment and practice, as well as visual examination and eye care to treat visual disorders 6.
• Special consideration is needed for people at a high risk of digital eye strain, such as computer workers and contact lens wearers 6.

Limitations of Current Evidence

• There is a lack of consistent evidence to support the use of blue-blocking lenses as a clinical treatment for digital eye strain 4.
• Many studies have limitations in study design and/or implementation, and there is a need for high-quality evidence to support the use of blue-blocking lenses for the general population 5.