Upper level: s2 The eye, ear and related structures
Lower livel:
s2200 Conjunctiva, sclera, choroid
s2201 Cornea
s2202 Iris
s2203 Retina
s2204 Lens of eyeball
s2205 Vitreous body
s2208 Structure of eyeball, other specified
s2209 Structure of eyeball, unspecified
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