In advanced stages, scar tissue forms, causing additional distortion and blurred vision. Retinal detachment may then follow. Laser and other surgical procedures that may reduce the progression of the disease and decrease the risk of vision loss can treat diabetic retinopathy. Not every person with diabetes develops retinopathy, but the likelihood of retinopathy increases after having diabetes for several years. Infection, drugs, chemical or physical injury to the eye and exposure to intense heat or radiation can cause cataracts.
Cataracts typically occur with advancing age, but can occur at birth.
The specific causes of cataracts are uncertain. Blurred vision is an early symptom of cataracts. A brighter light may be required for reading. Glare can cause hazy vision particularly on bright sunny days. A person with cataracts may have to hold reading material closer than usual and may experience double vision especially when looking at lights.