Glaucoma is caused by -

Ans. is 'a' i.e., Raised intraocular pressure The most common risk factor known is increased intraocular pressure (lOP)o Glaucoma is a group of eye diseases causing optic nerve damage i.e., glaucoma is a chronic, progressive optic neuropathy caused by a group of ocular conditions which lead to damage of optic nerveo Optic neuropathy in glaucoma results in a characteristic appearance of optic disc and a specific pattern of irreversible visual field defects, called glaucomatous changes. It is worth noting that raised IOP without optic neuropathy is not referred to as glaucoma, it is simply called ocular hypertension.So, glaucoma is a type of optic neuropathy, which is usually caused by increased IOP.