Blurred Vision After Phone Use: Causes and Solutions Explained - Ophthalmology

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After looking at a mobile phone, the eyes may become blurry and unable to focus?


Hello, doctor.
After using my phone, I experience blurriness and difficulty focusing, and things seem to spread out and appear double.
This does not happen when I use the computer or watch TV.
Could you please tell me what this issue might be? Additionally, recently when I turn my head in the dark, I occasionally see a faint white line in the lower left part of my vision, but there has been no increase in floaters.
Should I be concerned about this?

Ray, 20~29 year old female. Ask Date: 2021/04/16

Dr. Gao Pilin reply Ophthalmology


Hello Ray: Due to the small screen size of your mobile phone, the small text, and the close viewing distance, prolonged use can lead to these symptoms.
When you turn your head and see a dim white line, it's hard to determine what it is.
I recommend getting a dilated eye exam.
In Taiwan, the ophthalmology department at Puzi Hospital is available on Monday, Tuesday, Thursday, and Friday mornings from 8:00 AM to 12:00 PM, and Wednesday afternoons from 2:00 PM to 4:30 PM.
Please note that online responses can only serve as a reference; it is essential to seek medical attention at a healthcare facility if necessary.
I hope to have the opportunity to assist you.
Best regards, Gao Pi-Lin.

Reply Date: 2021/04/16

More Info


Blurred vision after using a smartphone is a common complaint, and it can be attributed to several factors related to how we use our devices. The symptoms you describe—difficulty focusing, a sensation of images spreading out, and seeing double—are often linked to digital eye strain, also known as computer vision syndrome. This condition arises from prolonged use of screens, particularly smaller ones like smartphones, which require more effort to focus on due to their size and proximity to the eyes.

When you use your smartphone, you tend to hold it closer than you would a computer or television screen. This close distance can lead to increased strain on the eye muscles, particularly the ciliary muscles, which are responsible for adjusting the lens of the eye to focus on objects at varying distances. Over time, this strain can result in temporary blurred vision, difficulty focusing, and even headaches. The phenomenon of seeing double or images appearing to spread out may be due to a temporary misalignment of the eyes or fatigue of the eye muscles.

The appearance of a faint white line in your peripheral vision when turning your head in the dark could be related to several factors as well. It might be a form of visual afterimage, which occurs when the photoreceptors in your eyes become overstimulated and continue to send signals to your brain even after the stimulus has been removed. This is particularly common in low-light conditions where your eyes are adjusting to darkness after being exposed to bright screens.

While these symptoms can be concerning, they are often not indicative of serious underlying conditions, especially if they are temporary and resolve after a short period. However, it is essential to monitor your symptoms. If they persist, worsen, or are accompanied by other symptoms such as significant vision changes, pain, or headaches, it would be prudent to seek a comprehensive eye examination from an eye care professional.

To alleviate your symptoms and prevent further discomfort, consider the following strategies:
1. Follow the 20-20-20 Rule: Every 20 minutes, take a 20-second break to look at something 20 feet away. This helps to relax the eye muscles and reduce strain.

2. Adjust Screen Settings: Ensure that your screen brightness is appropriate for your environment. Reducing blue light exposure, especially in the evening, can also help minimize eye strain.

3. Maintain Proper Distance: Hold your smartphone at a comfortable distance (about 16-18 inches from your eyes) and try to avoid using it in dark environments without adequate lighting.

4. Blink Regularly: When staring at screens, people tend to blink less, which can lead to dry eyes. Make a conscious effort to blink more often to keep your eyes moist.

5. Consider Eye Exercises: Simple eye exercises can help strengthen the eye muscles and improve focus.
6. Stay Hydrated: Proper hydration can help maintain eye moisture and overall eye health.

If you continue to experience these symptoms despite making adjustments, or if you notice any new or concerning changes in your vision, it is essential to consult with an eye care professional for a thorough evaluation. They can provide personalized advice and determine if any further action is necessary.

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