Cataracts are a common disease in ophthalmology, and the most important symptom of this disease is a varying degree of vision loss. Complications of this disease are usually seen in the over-ripe stage of the disease and are of two types: the first is the uveitis reaction, which is due to an overly cloudy lens with cortical liquefaction, so the liquefied cortex has the potential to cause a uveitis reaction in the eye. This reaction is a sterile inflammation, so it manifests as blurred vision, eye pain, and oozing in the eye. The second type of complication is secondary glaucoma, which is also seen in the overmaturity stage, where the liquefied cortex leaks from the anterior chamber and may block the atrial angle, causing an increase in intraocular pressure and manifesting as eye distention, headache, and nausea. Both of these conditions require early treatment.