In Reply.
—Dr Solomon raises interesting points, and, in my limited capacity as chairman of the group responsible for the new classification, I will do my best to answer them. In due course, individual members of the group may like to make further responses reflecting their personal experiences.
A principal objective of this classification is to provide staging criteria that have wide acceptance, are reasonably well defined, and can be observed by ophthalmologists and pediatricians not having recourse to special investigative techniques. The collective experience of the group members was insufficient to permit angiographic findings in a generally agreed upon classification, and it is my impression that most observers would be reluctant to undertake fluorescein angiography as a routine procedure in premature infants.
The timing of the examination is clearly important, but opinions as to the most appropriate intervals vary considerably. We did not feel able to make a general
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