Eye Strain: Causes, Symptoms, and Treatment

Overview

Eye strain, also known as asthenopia, is a common condition that occurs when your eyes get tired from intense use, such as driving long distances or staring at digital screens. While eye strain can be annoying, it usually isn’t serious and goes away once you rest your eyes or take other steps to reduce your eye discomfort. However, in some cases, eye strain can be a sign of an underlying eye condition that needs treatment.

According to the American Optometric Association, about 50% to 90% of people who work at a computer screen have at least some symptoms of eye strain. With the increasing use of digital devices, this condition is becoming more prevalent across all age groups, though it is particularly common among adults aged 18 to 34 who spend significant time on screens.

Symptoms

Eye strain can cause a variety of symptoms, which may include:

• Sore, tired, burning, or itching eyes: Your eyes may feel uncomfortable, as if they are being pulled or weighed down.
• Watery or dry eyes: You might experience excessive tearing or a sensation of dryness.
• Blurred or double vision: Your vision may become temporarily unclear or you may see two images instead of one.
• Headache: Often felt around the temples or behind the eyes.
• Sore neck, shoulders, or back: Poor posture while using screens can contribute to muscle tension.
• Increased sensitivity to light: Bright lights may become more bothersome than usual.
• Difficulty concentrating: You may find it hard to focus on tasks, especially those requiring visual attention.
• A sensation of having something in your eyes: This can feel like grit or sand in your eyes.

These symptoms can range from mild to severe and may worsen throughout the day, especially with prolonged screen use or other visually demanding tasks.

Causes and Risk Factors

Eye strain is often caused by prolonged use of digital devices, reading, driving, or other activities that require extended focus. Common causes include:

• Prolonged screen time: Staring at computers, smartphones, tablets, or other digital screens for long periods is a leading cause. The blue light emitted by these devices can contribute to eye strain.
• Poor lighting: Glare from bright lights or reflections on your screen can force your eyes to work harder.
• Improper viewing distances: Sitting too close to or too far from a screen can strain your eyes.
• Poor posture: Slouching or holding your body in an awkward position while using a screen can contribute to eye and muscle strain.
• Uncorrected vision problems: If you have refractive errors like nearsightedness (myopia), farsightedness (hyperopia), or astigmatism, and you’re not wearing corrective lenses, your eyes have to work harder to focus.
• Dry eyes: Blinking less frequently while using screens can lead to dry eyes, which exacerbates strain.
• Stress and fatigue: General tiredness or stress can make it harder for your eyes to focus and increase susceptibility to strain.

Risk Factors

Certain factors can increase your risk of developing eye strain, including:

• Working in jobs that require long hours of screen use, such as office work, graphic design, or programming.
• Spending excessive time on digital devices for entertainment, such as gaming, watching videos, or scrolling through social media.
• Having an underlying eye condition, such as dry eye syndrome or uncorrected refractive errors.
• Poor ergonomics at your workspace, such as improper chair height, screen position, or lighting.
• Not taking regular breaks during visually demanding tasks.

Diagnosis

Eye strain is typically diagnosed based on your symptoms and a review of your daily habits, particularly those related to screen use. Your eye doctor may perform the following during an examination:

• Medical history: Your doctor will ask about your symptoms, how long you’ve had them, and your daily activities, especially screen time.
• Eye examination: This may include tests to check your visual acuity (sharpness), refractive error, and how well your eyes focus, move, and work together.
• Slit-lamp examination: A microscope is used to examine the front and back of your eyes for signs of dryness, inflammation, or other issues.
• Tear film evaluation: If dry eyes are suspected, your doctor may measure the quantity or quality of your tears.

In most cases, no specialized tests are needed. However, if your doctor suspects an underlying condition, further testing may be recommended.

Treatment Options

Treatment for eye strain usually involves a combination of lifestyle changes, home remedies, and, in some cases, medical interventions. Here are the most common approaches:

Lifestyle and Home Remedies

• Follow the 20-20-20 rule: Every 20 minutes, look at something 20 feet away for 20 seconds. This helps relax the focusing muscle in your eyes.
• Adjust your workspace:
  • Position your screen about 20 to 30 inches away from your eyes and slightly below eye level.
  • Use an anti-glare screen or adjust lighting to reduce reflections.
  • Ensure your chair is comfortable and supports good posture.
• Take regular breaks: Follow the Pomodoro Technique or similar methods to take short breaks every 30 to 60 minutes.
• Blink frequently: This helps keep your eyes moist and reduces dryness.
• Use artificial tears: Over-the-counter lubricating eye drops can help relieve dryness and irritation.
• Adjust screen settings:
  • Increase text size for easier reading.
  • Adjust brightness and contrast to comfortable levels.
  • Use "night mode" or blue light filters to reduce exposure to blue light.

Medical Treatments

If lifestyle changes aren’t enough, your doctor may recommend:

• Prescription glasses or contact lenses: If you have an uncorrected refractive error, corrective lenses can significantly reduce eye strain.
• Specialized computer glasses: These glasses are designed to optimize your vision for screen distances and may include blue light filtering.
• Treatment for dry eyes: If dry eyes are contributing to your symptoms, your doctor may prescribe medicated eye drops, such as cyclosporine (Restasis) or lifitegrast (Xiidra).
• Vision therapy: In some cases, especially if eye strain is related to problems with eye focusing or coordination, vision therapy (a type of physical therapy for the eyes) may be recommended.

Living with Eye Strain

If you experience frequent eye strain, making long-term adjustments to your habits and environment can help you manage symptoms effectively. Here are some practical tips:

• Optimize your workspace:
  • Invest in an ergonomic chair and desk setup.
  • Use a monitor stand to position your screen at the correct height.
  • Consider using a document holder if you frequently refer to printed materials while working.
• Stay hydrated: Drinking enough water helps maintain moisture in your eyes.
• Eat a balanced diet: Foods rich in omega-3 fatty acids (like fish), vitamins A, C, and E, and zinc can support eye health.
• Limit screen time before bed: Reducing screen use in the evening can improve sleep quality and reduce eye strain.
• Use humidifiers: If you work in a dry environment, a humidifier can help prevent dry eyes.
• Practice good sleep hygiene: Ensure you get enough rest, as fatigue can worsen eye strain.

Prevention

Preventing eye strain involves adopting healthy habits and making adjustments to your environment. Here are key strategies:

• Take regular screen breaks: Follow the 20-20-20 rule and take longer breaks every hour.
• Adjust lighting: Ensure your workspace is well-lit but free from glare. Use curtains or blinds to control natural light.
• Use proper eyewear: If you need glasses or contacts, wear them as prescribed. Consider computer glasses if you spend a lot of time on screens.
• Maintain good posture: Sit with your back straight, shoulders relaxed, and feet flat on the floor. Your screen should be at or slightly below eye level.
• Stay hydrated and blink often: Keep your eyes moist by drinking water and reminding yourself to blink, especially while using screens.
• Get regular eye exams: Visit your eye doctor at least once a year, or more often if you have existing vision problems.
• Limit screen time for children: Encourage kids to take breaks and engage in outdoor activities to reduce their risk of eye strain.

Complications

While eye strain itself is not a serious condition, chronic or untreated eye strain can lead to several complications, including:

• Chronic headaches: Frequent eye strain can contribute to tension headaches or migraines.
• Worsening vision problems: Straining your eyes over time can exacerbate underlying refractive errors or other eye conditions.
• Dry eye syndrome: Prolonged screen use without adequate blinking can lead to chronic dry eyes, which may require ongoing treatment.
• Reduced productivity: Difficulty concentrating and discomfort can affect your performance at work or school.
• Increased risk of myopia (nearsightedness): Some studies suggest that excessive near work, such as screen time, may contribute to the development or progression of myopia, especially in children.

Addressing eye strain early can help prevent these complications and improve your overall quality of life.

When to Seek Emergency Care

References

• Mayo Clinic
• American Optometric Association
• National Eye Institute (NIH)
• Centers for Disease Control and Prevention (CDC)
• Cleveland Clinic