Eye Fatigue: Myths and Facts About Corneal Health

Thank you once again?

Thank you for your response, Doctor.
I am concerned that every time my eyes feel very fatigued and dry, it might affect the hardness of the cornea and sclera, thereby weakening their support.
This worry makes my eyes even more fatigued.
So, you mentioned that eye fatigue and dryness do not affect the hardness of the cornea and sclera, which means it won't impact their support, right? Also, could you please explain what causes the sensation of heaviness and pressure in my eyes? Thank you for your assistance.

A-Zai, 30~39 year old female. Ask Date: 2015/05/01

Dr. Gao Pilin reply Ophthalmology

Hello,
Eye fatigue and dryness do not affect the hardness of the cornea and sclera, and therefore do not impact their structural support.
A common sensation of soreness and pressure in the eyes is usually due to excessive use, leading to eye fatigue.
This condition is referred to as Computer Vision Syndrome (CVS).
In addition to eye symptoms, there are various other manifestations, such as:
1.
Eye discomfort, dryness, blurred vision, and tearing.

2.
Neck, shoulder, and wrist pain.

3.
Psychological symptoms and general fatigue, including hypertension.

The underlying cause is prolonged near-work, which leads to excessive convergence and ciliary muscle contraction, resulting in overstimulation of the parasympathetic nervous system and the aforementioned symptoms.
Additionally, don't forget to blink; when focusing on a task, the frequency of blinking often decreases, leading to dryness.

In modern times, heavy use of smartphones and computers makes these symptoms quite common.
Furthermore, extended periods of near work or reading can also lead to these issues, indicating that your eyes need more rest and should not be overworked!
Taiwan E-Hospital Puzi Hospital Ophthalmology:
Monday to Friday: 8:00 AM – 12:00 PM
Monday Evening: 6:00 PM – 8:00 PM
Wednesday Afternoon: 1:00 PM – 4:30 PM
I hope to have the opportunity to serve you.

Best regards,
Gao Pilin

Reply Date: 2015/05/01

More Info

Eye fatigue, often referred to as asthenopia, is a common condition that many people experience, especially in our modern world where screen time is prevalent. Understanding the myths and facts surrounding eye fatigue and its impact on corneal health is crucial for maintaining optimal eye health.

Firstly, it is important to clarify that while eye fatigue can lead to discomfort, it does not directly affect the structural integrity of the cornea or sclera (the white part of the eye). The cornea is a transparent layer that covers the front of the eye, and the sclera provides structural support. Both are composed of collagen and other proteins that maintain their strength and shape. Eye fatigue primarily results from prolonged use of the eyes, particularly when focusing on screens or reading materials for extended periods. This can lead to symptoms such as dryness, discomfort, and a feeling of heaviness or pressure around the eyes.

The sensation of "eye strain" or feeling "heavy" in the eyes is often due to the overuse of the eye muscles, particularly the ciliary muscles that control the lens's shape for focusing. When you stare at a screen or read for long periods without breaks, these muscles can become fatigued, leading to discomfort. Additionally, reduced blinking during screen time can contribute to dryness, as blinking is essential for spreading tears over the surface of the eye, keeping it moist and comfortable.

Regarding your concern about whether eye fatigue can weaken the cornea or sclera, the answer is no. Eye fatigue does not compromise the hardness or structural support of these tissues. However, chronic eye strain can lead to other issues, such as dry eye syndrome, which can cause discomfort and may require treatment, such as artificial tears or other lubricating eye drops.

The feeling of "soreness" or "pressure" in the eyes can also be attributed to several factors. One common cause is digital eye strain, which occurs when the eyes are overworked from looking at screens. Symptoms can include blurred vision, headaches, and discomfort. Another factor could be uncorrected vision problems, such as refractive errors (myopia, hyperopia, or astigmatism), which can lead to additional strain as the eyes work harder to focus.

To alleviate eye fatigue, consider the following strategies:
1. The 20-20-20 Rule: Every 20 minutes, take a 20-second break to look at something 20 feet away. This helps relax the eye muscles.

2. Proper Lighting: Ensure that your workspace is well-lit to reduce glare on screens and minimize strain.

3. Blink Regularly: Make a conscious effort to blink more often, especially when using screens, to keep your eyes moist.

4. Use Artificial Tears: If you experience dryness, lubricating eye drops can help relieve discomfort.

5. Regular Eye Exams: Ensure that your vision is regularly checked and that you have the correct prescription for glasses or contact lenses if needed.

6. Adjust Screen Settings: Increase text size, adjust brightness, and use blue light filters to reduce strain.

In conclusion, while eye fatigue can be uncomfortable and lead to symptoms like dryness and soreness, it does not weaken the cornea or sclera. By understanding the causes of eye fatigue and implementing preventive measures, you can help maintain your eye health and comfort. If symptoms persist or worsen, it is advisable to consult an eye care professional for a comprehensive evaluation and tailored recommendations.

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