eye disorders
Overview of Refractive Error
Symptoms and Signs of Refractive Error
The primary symptom of refractive errors is blurred vision for distant objects, near objects, or both. Headache may result from excessive compensatory ciliary muscle tone or prolonged squinting and frowning. Refractive error can contribute to eyestrain (eye discomfort and fatigue), in which excessive staring (eg, at a computer screen) can lead to ocular surface desiccation, causing eye irritation, itching, visual fatigue, foreign body sensation, and redness. Frowning and squinting when reading and excessive blinking or rubbing of the eyes are symptoms of refractive error in children. 