Xerophthalmia WHO Grading
World Health Organization classified xerophthalmia into following stages:
XN-Night blindness
X1A-Conjunctival xerosis
X1B-Bitot spots
X2-Corneal xerosis
X3A-Corneal ulceration/keratomalacia, involving less than one-third of the cornea
X3B-Corneal ulceration/keratomalacia, involving more than one-third of the cornea
XS-Corneal scar due to xerophthalmia
XF-Xerophthalmic fundus
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