Fuzzy, indistinct visual images. Double vision (diplopia) and blurred vision should not be confused. Double vision can occur in one or both eyes, for episodes of varying lengths of time and can develop suddenly or gradually. The common cause of longstanding blurred vision is a refractive error such as astigmatism (unequal curvature of the front of the eye), hypermetropia (long-sightedness) or myopia (short-sightedness), all of which can be put right with contact lenses or glasses. After reaching the age of 40 presbyopia (reduced ability to focus on near objects) becomes more common.
Vision can also be impaired or damaged as a result of disease, damage or abnormalities of parts of the eye or its connections to the brain. Blurred vision as a result of disease is often caused by retinopathy or cataract.