What Is Computer Vision Syndrome?
Computer Vision Syndrome (CVS), also called digital eye strain, affects up to 90% of people who use screens for two or more hours daily. Whether you work at a desk, attend school remotely, or scroll your phone throughout the day, your eyes are working harder than you think.
El Sindrome de Vision por Computadora, tambien llamado fatiga visual digital, afecta hasta el 90% de las personas que usan pantallas por dos o mas horas al dia.
Symptoms of Digital Eye Strain / Sintomas
- Headaches during or after screen use
- Blurred vision at the computer or when looking away
- Dry, irritated, or watery eyes
- Neck and shoulder pain from poor posture
- Difficulty focusing between screen and distance
- Increased light sensitivity
Why Screens Strain Your Eyes
Your eyes weren't designed for prolonged close-up digital work. Here's what happens:
- Reduced blinking: You blink up to 66% less while looking at screens, causing dry eye
- Focusing fatigue: Your eye muscles stay contracted to focus at screen distance, leading to strain
- Blue light exposure: High-energy visible light from screens can contribute to eye fatigue (though the science on blue light blocking is nuanced)
- Poor ergonomics: Screen position, lighting, and posture all affect eye comfort
- Glare: Reflections on screens force your eyes to work harder
The 20-20-20 Rule / La Regla 20-20-20
The simplest and most effective habit for preventing digital eye strain:
Every 20 minutes, look at something 20 feet away for at least 20 seconds.
This relaxes your focusing muscles and encourages natural blinking. Set a timer if you tend to lose track of time at the computer.
Cada 20 minutos, mire algo a 20 pies de distancia por al menos 20 segundos.
Workspace Setup Tips
- Screen distance: Position your monitor 20-26 inches from your eyes (about arm's length)
- Screen height: Top of the screen should be at or slightly below eye level
- Lighting: Reduce overhead glare; position your screen perpendicular to windows
- Text size: Increase font size so you don't lean forward to read
- Screen brightness: Match your screen brightness to the surrounding environment
- Anti-glare screen: Consider a matte screen protector to reduce reflections
Glasses for Screen Use
Even if you have 20/20 distance vision, you may benefit from computer glasses:
- Anti-reflective coating: Reduces glare from screens and overhead lights
- Blue light filtering: May help reduce eye fatigue for some people (read our blue light guide)
- Computer-distance prescription: Optimized for the 20-26 inch range where screens sit
- Progressive lenses: For those over 40, progressives with a wide intermediate zone make screen work more comfortable
Children and Screen Time / Ninos y Pantallas
Kids are especially vulnerable to digital eye strain because they often don't recognize or report symptoms. Signs to watch for:
- Rubbing eyes frequently during homework or tablet use
- Complaining of headaches after school
- Holding devices very close to face
- Squinting at screens
The American Academy of Ophthalmology recommends children take frequent breaks and spend time outdoors daily, which may also help prevent myopia progression.
When to Get an Eye Exam
If digital eye strain persists despite trying these tips, you may need a comprehensive eye exam. Undiagnosed vision problems -- even mild ones -- can make screen use significantly more uncomfortable.
At Reyes Vision, we evaluate your vision at all distances including computer range and can prescribe glasses optimized for your screen setup.
Walk-in eye exams available. We accept Medicaid, Medicare, and most insurance plans. Se habla espanol.