Causes of blurred vision include astigmatism, hyperopia, myopia, cataracts, presbyopia, medications, dry eyes and ocular migraines or migraine headaches, as reported by MedicineNet. Other life and medical states, such as pregnancy, age-related macular degeneration, blurred vision after LASIK and over-wearing disposable contact lenses, can cause blurred vision, claims AllAboutVision.com.
Refractive errors such as myopia, hyperopia and astigmatism are the main causes of blurred vision. These refractive errors can manifest in one or both eyes and require an eye exam to determine the precise cause, claims the All About Vision website. Myopia, or nearsightedness, is the most commonly occurring refractive error. Myopia causes objects at a distance appear blurred as opposed to hyperopia where close objects appear blurred. In astigmatism objects at all distances appear blurred. All these refractive errors can be corrected using refractive eye surgery or contact lenses.
Dry-eye syndrome is another cause of blurred vision; lubricating eye drops are used to correct this symptom. Some prescribed drugs, supplements and over-the-counter drugs also cause blurred vision. Notable examples of such drugs include psychotropic drugs, oral contraceptives, antihypertensives, cortisone, antidepressants, anticholinergics and heart medications, reports EyeHealthWeb.com.
Patients are advised to avoid such medications, as well as alcoholic drinks known to alter vision.