Cataracts are a clouding of the lens of the eye, which can lead to blurred vision, glare, and difficulty seeing at night.

Cataracts are the leading cause of blindness in the world, affecting over 20 million people.

Glaucoma is a condition that damages the optic nerve, which can lead to vision loss and blindness.

Macular degeneration is a condition that damages the macula, which is the part of the eye responsible for central vision.

Diabetic retinopathy is a condition that damages the retina, which is the light-sensitive tissue at the back of the eye.

The symptoms of cataracts include blurred vision, glare, difficulty seeing at night, and double vision.

The symptoms of glaucoma include pain in the eye, redness in the eye, blurred vision, and halos around lights.

The symptoms of macular degeneration include blurred vision, difficulty reading, difficulty seeing colors, and a dark spot in the center of vision.

The symptoms of diabetic retinopathy include blurred vision, floaters, dark spots in vision, and difficulty seeing colors.

Cataracts are treated with surgery, which involves removing the cloudy lens of the eye and replacing it with an artificial lens.

Glaucoma is treated with medication, surgery, laser therapy, or a combination of these treatments.

Macular degeneration is treated with medication, such as anti-VEGF drugs, which can help to slow the progression of the disease.

Diabetic retinopathy is treated with medication, surgery, laser therapy, or a combination of these treatments.

The risk factors for cataracts include age, diabetes, smoking, and prolonged exposure to ultraviolet radiation.

The risk factors for glaucoma include age, family history of glaucoma, African American race, and certain medical conditions, such as diabetes and high blood pressure.

The risk factors for macular degeneration include age, smoking, obesity, and a family history of the disease.

The risk factors for diabetic retinopathy include diabetes, high blood pressure, high cholesterol, and a long duration of diabetes.