Which of the following is one of the most common and serious ocular disorders, characterized by increased ocular pressure, and causes blindness if left untreated?

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One of the most common and serious ocular disorders is a group of diseases known as glaucoma. Glaucoma is characterized by increased intraocular pressure (IOP), which damages the optic nerve and causes blindness if left untreated. Symptoms of corneal abrasion include pain, inflammation, tearing, and photophobia. The abrasion usually is caused by a foreign body in the eye or by direct trauma, such as from poorly fitting or dirty contact lenses. A cataract is a cloudy or opaque area in the normally clear lens of the eye that blocks the passage of light into the retina, causing impaired vision. This condition may result from injury to the eye, exposure to extreme heat or radiation, or inherited factors. However, most cataracts develop slowly and progressively as a result of the natural aging deterioration of the lens of the eye and typically occur after age 60. Macular degeneration is progressive deterioration of the macula lutea, which causes loss of central vision; the patient can see only the edges of the visual field. It affects more than 10 million Americans and is a leading cause of blindness in those older than 50.

Which of the Following Is One of the Most Common