Table 2.

Comparison of causative factors among four groups

Causative factors	A1 Group(n = 15)	A2 Group(n = 14)	B1 Group(n = 12)	B2 Group(n = 12)
Plant traumab	6(40.00%)	7(50.00%)	4(33.33%)	8(66.67%)
Other causesc	5(33.33%)	6(42.86%)	2(16.67%)	2(16.67%)
No clear cause	4(26.67%)	1(7.14%)	6(50.00%)	2(16.67%)

ᵇIncludes grass debris, tree branches, sugarcane leaves, rice grains, wood chips, chestnut shells, bean sprouts, and bamboo chips

ᶜIncludes insects, eye rubbing, sand, and iron rod injury