Blurred vision is not a diagnosis—it is a shared alarm signal with many possible causes. One common, relatively benign mechanism is dryness-related fluctuating blur: during prolonged screen focus the tear film destabilizes, vision intermittently hazes, and blinking temporarily improves clarity. Other frequent causes include refractive changes (myopia/hyperopia/astigmatism), incorrect glasses, contact lens mismatch, allergic irritation, and poor sleep. Management depends on the driver: for dryness-related fluctuation, screen hygiene plus suitable artificial tears and environmental adjustments can be effective. If a prescription change is involved, expecting “eye exercises” to fix it is unrealistic; accurate refraction is needed. If allergy is the cause, trigger reduction and an appropriate treatment plan matter. More serious causes (cataract, glaucoma, retinal disease, diabetic eye involvement) may not be obvious without an exam. Urgent red flags include sudden one-sided blur or vision loss, flashes with a “curtain” sensation, severe eye pain with nausea, trauma or chemical exposure, and marked redness with discharge. In these cases, waiting at home is risky. If blur is new or worsening—especially in people over 40 or with diabetes/hypertension—prompt eye evaluation can prevent permanent damage.