Article Figures & Data
Figures
- FIGURE 1
Scheme of retina of the right and left eyes showing zone borders and clock hours used to describe the location and extent of ROP. Diagrammatic representation of the potential total area of the premature retina, with zone I (the most posterior) symmetrically surrounding the optic nerve head (the earliest to develop) is shown. A larger retinal area is present temporally (laterally) rather than nasally (medially) (zone III). Only zones I and II are present nasally. The retinal changes discussed in recommendation 4 are usually recorded on a diagram such as this one.
Tables
Gestational Age at Birth, wk Age at Initial Examination, wk Postmenstrual Chronologic 22a 31 9 23a 31 8 24 31 7 25 31 6 26 31 5 27 31 4 28 32 4 29 33 4 30 34 4 Older gestational age, high-risk factorsb — 4 Shown is a schedule for detecting prethreshold ROP with 99% confidence, usually before any required treatment. —, not applicable.
↵a This guideline should be considered tentative rather than evidence based for infants with a gestational age of 22 to 23 wk because of the small number of survivors in these postmenstrual age categories.
↵b Consider timing on the basis of the severity of comorbidities.
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