‘Blue-light filtering spectacle lenses’, or ‘blue-light blocking glasses’, aim to filter ultraviolet radiation and varying portions of short-wavelength visible light. They thus are considered to protect the eyes from digital strain.
A systemic metanalysis of several randomised controlled trials (Cochrane Database Syst Rev, 2023) has revealed that blue-light filtering spectacle lenses or Computer Vision Glasses don’t really decrease the symptoms of eye strain with computer use, over a short-term follow-up period.
Also, contrary to popular belief, blue-light filtering spectacle lenses probably do not improve sleep quality, contrast sensitivity, colour discrimination either. Very few patients report an improvement in glare discomfort, or overall visual satisfaction. There is no significant impact on macular health, or serum melatonin levels either.
Using computer glasses, however, doesn’t really have any damaging effects on the eye.
In fact, what you can do to decrease digital eye strain or computer vision syndrome is:
- Adjust Screen Settings: Adjust your screen’s brightness ( apps can change the colour of your monitor over the day: warm at night and like sunlight during the day, and decrease sleep-wake disturbances), contrast, and font size can further enhance your viewing experience. Larger screens cause less strain.
- Ensure proper lighting to reduce glare and use an anti-glare screen if necessary.
- Take Regular Breaks: Remember the 20-20-20 rule – every 20 minutes, close your eyes for 20-seconds. Open your eyes and focus on something at least 20 feet away to give your eyes a chance to relax.
- Remember to blink more often. This helps prevent dry eyes.
- Decrease Screen Time: Whenever possible, decrease your screen time. No screens two hours before bedtime.
- Maintain an ergonomic setup with the screen about 20-24 inches from your eyes and the top of the screen at or just below eye level.
- Use artificial tears to prevent dryness and take regular breaks to rest your eyes.
- Regular eye check-ups can help detect and prevent any potential issues.
