There are two main forms of glaucoma: open-angle (the most common form, affecting approximately 70-90% of individuals); and angle-closure. There are also several other forms of glaucoma, including normal-tension, congenital, juvenile, and secondary OPEN ANGLE GLAUCOMA: This is the most common form of glaucoma which is progressive and causes optic nerve damage. The most significant risk factor for the development and progression of this form is high intra ocular pressure. Initially, there are usually no symptoms, but as eye pressure gradually builds, at some point the optic nerve is impaired and peripheral vision is lost. Without treatment, an individual can become totally blind. ANGLE CLOSURE GLAUCOMA: It occurs due to the closure of anterior chamber angle. Angle-closure glaucoma may be acute or chronic. In acute angle closure (also called closed angle) glaucoma, the normal flow of eye fluid (aqueous humor) between the iris and the lens is suddenly blocked. Symptoms may include severe pain, nausea, vomiting, blurred vision, and seeing a rainbow halo around lights. Acute angle-closure glaucoma is a medical emergency and must be treated immediately, or blindness could result in one or two days. Chronic angle-closure glaucoma progresses more slowly and can damage the eye without symptoms, similar to open-angle glaucoma Normal-tension glaucoma: Normal-tension glaucoma occurs when eye pressure is normal, yet the optic nerve is damaged and peripheral vision is lost. Lowering eye pressure through medication sometimes slows the progress of the disease, but this type of glaucoma may worsen despite low pressure.It is advisable to rule out cardiac problems. The treatment is generally the same as for open-angle glaucoma. Congenital Glaucoma: This affects infants born with defect in the normal drainage of fluid from the eye Juvenile Glaucoma: Juvenile glaucoma is open-angle glaucoma that affects children, adolscents, and young adults Secondary glaucoma: This form of glaucoma occurs due to pre-existing ocular diseases like trauma to eye or any inflammation of eye or any degenerative changes in eye.