Squinting often occurs when people try to see clearly at a distance, read small text, or use a phone. This behavior can stem from several underlying causes.
Excessive eye strain
According to the American Academy of Ophthalmology, squinting can temporarily improve vision. It reduces the amount of light entering the eyes, limiting light scattering and making images clearer.
Many people squint when viewing whiteboards, reading distant signs, or using phones in dim light. However, if this behavior becomes frequent, it may signal that the eyes are straining to focus.
Verywell Health warns that prolonged squinting can lead to eye fatigue, headaches, or blurred vision by the end of the day.
Refractive errors
Refractive errors, such as nearsightedness, farsightedness, or astigmatism, are among the most common causes. Uncorrected vision forces the eyes to strain for clarity, leading to unconscious squinting.
Dry eyes and eye fatigue
Dry eyes and eye fatigue from prolonged screen time can cause discomfort, blurred vision, or light sensitivity. The Cleveland Clinic notes that continuous computer and phone use for many hours reduces blink frequency, making eyes prone to dryness and strain.
Strabismus (crossed eyes)
In children, frequent squinting can sometimes indicate strabismus, or crossed eyes, which involves issues with binocular coordination. This condition means the two eyes do not look in the same direction or align properly. While common in children, strabismus can also affect adults, manifesting continuously or intermittently.
Ophthalmology experts state that a common cause is the asynchronous operation of eye movement muscles, preventing both eyes from focusing on the same object simultaneously. Strabismus can also result from injuries or brain disorders affecting binocular coordination.
Treatment for strabismus varies by cause, including corrective lenses, eye exercises, or surgery. Parents should watch for signs in children such as head tilting, continuous blinking, or complaints of double vision.
When to see an eye doctor
Adults should have their vision checked if frequent squinting occurs with symptoms like headaches, blurred vision, double vision, or prolonged eye fatigue.
Children also require early examination if their eyes show signs of misalignment or asynchronous movement. Early detection and treatment can limit the risk of amblyopia (lazy eye) and long-term vision impairment.
Doctors recommend regular eye breaks when using electronic devices to reduce squinting and excessive strain. The 20-20-20 rule is often recommended: after every 20 minutes of screen time, look at an object about 6 meters away for 20 seconds to relax your eyes.
Maintaining a reasonable distance from screens, getting enough sleep, and using moisturizing eye drops for dry eyes can also help alleviate this condition.
By Bao Bao (Compiled)
