an eye disease that damages the optic nerve and impairs vision (sometimes progressing to blindness); "contrary to popular belief, glaucoma is not always caused by elevated intraocular pressure" 視神経に損傷を与えて、視力を弱める眼の疾患（時に盲目へとつながる）。
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【下位】 glaucoma in which the iris blocks the outflow of aqueous humor; "closed-angle glaucoma can cause a rapid buildup of high intraocular pressure that results in permanent visual damage in a couple of days" 虹彩が水様液の流出を妨げる緑内障。
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【下位】 glaucoma caused by blockage of the canal of Schlemm; produces gradual loss of peripheral vision; "open-angle glaucoma is the most common type of glaucoma" シュレム管の閉塞が原因の緑内障。周辺視力を徐々に失わせる。
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【下位】 glaucoma that results from damage to the optic nerve although the intraocular pressure is normal 眼圧は普通だが、視神経損傷から生じる緑内障。
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