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Here are some of the common symptoms of glaucoma that occur in mild, moderate, to severe conditions:

• Severe headache
• Severe eye pain
• Nausea or vomiting
• Blurred vision
• Eye redness
• Halos or colored rings around lights
• Difficulty seeing objects in central vision
• Patchy blind spots in side vision (peripheral vision)

Glaucoma in children

• Worsening nearsightedness
• Tears without crying
• Dull or cloudy eye
• Increased blinking
• Blurred vision
• Headache

Glaucoma is caused due to the deterioration of the optic nerve, generating blind spots in vision for uncertain reasons but often tied to elevated eye pressure. Increased pressure results from excess fluid or impaired drainage. Here are different types caused by different reasons:

• Open-angle glaucoma: A slow pressure rise despite the open drainage angle. 
• Angle-closure glaucoma: The iris obstructs drainage, causing pressure increase.
• Normal-tension glaucoma: Damage despite normal eye pressure due to poor blood flow. 
• Glaucoma also affects children due to blocked drainage or underlying conditions. 
• Pigmentary glaucoma: Involves pigment granules hindering fluid drainage
• Genetic factors: Genes linked to high eye pressure and nerve damage.