The image depicts Bitot’s spot, a pathognomonic feature of xerophthalmia.
– Its triangular, silvery-white, foamy patch on the bulbar conjunctiva.
– It is usually bilateral.
– Most common site: Temporal
– Not reversible
The term xerophthalmia is reserved to cover all the ocular manifestations of vitamin A deficiency.
- XN: Night blindness
- X1A: Conjunctival xerosis
- X1B: Bitot’s spots
- X2: Corneal xerosis
- X3A: Keratomalacia involving < 1/3 of the cornea.
- X3B: Keratomalacia involving > 1/3 of the cornea.
- XS: Xerophthalmic scarring.
- XF: Xerophthalmic fundus—white-spotted fundus due to a change in the outer segment of rods.
The first symptom of xerophthalmia is nyctalopia.
The first sign of xerophthalmia is conjunctival xerosis.
The pathognomonic feature of xerophthalmia is the appearance of Bitot’s spot.