Eye strain

Eye strain's symptoms can be broken into two groups: Internal Symptom Factors (ISF) and External Symptom Factors (ESF). Symptoms of eye strain can include: • ocular surface (dryness, irritation, redness) • accommodative (difficulty focusing on near objects) • vergence (misalignment when turning eyes inward or outward) • extra-ocular (muscle discomfort around the eyes, neck, and shoulders) The recognition of these categories helps describe eye strain presentations and guide potential interventions. == Causes ==

Asthenopia can result from various factors. These causes can be categorized as ocular issues, digital use patterns, environmental factors, or underlying health conditions, including: • Uncorrected refractive errors (astigmatism, hyperopia, anisometropia, etc.) • Eye movement coordination • Accommodative and vergence stress • Glare • Flickering lights • Allergy • Close viewing distance • Dry-eye • Fatigue • Upward gaze • Prolonged reading from smartphone ==Diagnosis==

Given that asthenopia is caused by different factors, treatment may involve the work environment or visual conditions. Often found in connection to Digital Eye Strain (DES), eye strain can be reduced by following the 20–20–20 rule, which consists of looking at something 20 feet away for 20 seconds every 20 minutes. Short, frequent breaks have been found to reduce visual fatigue more effectively than longer, less frequent ones. This makes scheduled breaks a useful strategy to mitigate eye strain. In addition to break regimens, environmental adjustments and ergonomics can help reduce eye strain. Adjusting screen brightness and contrast, optimizing ambient lighting, and changing the color of text further improves comfort during prolonged tasks. == See also ==