A bilateral proliferative retinopathy affecting premature babies was originally described by Terry in the US in 1942. It arises from the disruption of the anterior growth of the retinal vasculature in premature infants, normally complete at 32 weeks (nasal retina) to 40-42 weeks (temporal retina).
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Classification and Signs
An international classification of ROP was published in 1984 and 1987. ROP is classified according to the location of involved retina (divided into three zones), the extent of retinal involvement in clock hours, the stage the disease has reached and other changes.
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