Purpose: To evaluate the macular development in preterm infants with spontaneously regressed retinopathy of prematurity (ROP) utilizing handheld spectral domain optical coherence tomography (SD-OCT) during the early postnatal period.
Design: A cross-sectional observational study.
Methods: Using handheld SD-OCT, OCT images were acquired in non-sedated infants ages about 37 weeks(w) post-menstrual-age (PMA = gestational age in weeks + chronological age). Central foveal thickness (CFT), mean parafoveal thickness (PT, mean of the temporal and nasal-lateral retinal thickness 1000 μm from the foveal center), the thickness of inner retina layers (IRL) and outer retina layers (ORL) of the foveal center and parafoveal, the depth of the macular fovea (FD), and the angle of the macular fovea (FA) were measured and analyzed.
Results: In contrast to the infants without ROP (group 1), OCT images of the infants with spontaneously regressed ROP (group 2) were more immature. The FD of Group 2 was shallower than Group 1 (P < 0.05); CFT and the foveal center IRL (FIRL) of Group 2 were thicker than Group 1 (P < 0.05); conversely, PT and the mean parafoveal IRL (PIRL) of Group 2 were thinner than Group 1 (P < 0.05); FA of Group 2 was bigger than Group 1 (P < 0.05); however, there was no significant difference in the foveal center ORL (FORL) and the mean parafoveal ORL (PORL) between Groups 1 and 2 (P > 0.05). Furthermore, in preterm infants, ROP was moderately correlated with FD, CFT, PT, FIRL, and PIRL (P < 0.05).
Conclusions: The spontaneously regressed ROP resulted in immature macular development in the early postnatal period. The inner retinal layers mainly contribute to this but not the outer retinal layers, indicating that the macular fovea's inner and outer retina layers developed asynchronously. ROP is an influential factor in macular development and maturation. This may be associated with the higher probability of visual impairment in children with a history of spontaneous regression of ROP at a prior time.
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