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Retinal vascular patterns in the macula and the perimacular area in premature and full-term infants
Insights
This study examined retinal vessel development in infants, finding that radial peripapillary capillaries and the macular capillary-free zone form at specific gestational ages. Temporal retinal vessels show a V-shape in premature infants.
Area of Science:
- Ophthalmology
- Developmental Biology
- Neonatology
Background:
- Retinal vascularization is crucial for vision.
- Understanding the development of retinal vasculature in premature infants is vital for identifying potential pathologies.
Purpose of the Study:
- To investigate the temporal progression of retinal vascular development in premature and full-term infants.
- To characterize the formation of radial peripapillary capillaries (RPCs) and the macular capillary-free zone.
Main Methods:
- Analysis of 27 infant eyes using trypsin digestion.
- Observation of temporal retinal vessel extension, RPC formation, and macular capillary-free zone development.
- Correlation of vascular patterns with gestational age (23-29 weeks).
Main Results:
- Temporal retinal vessels displayed a V-shaped border in infants aged 23-29 weeks.
- RPCs were observed after 27 weeks of gestation.
- The macular capillary-free zone appeared after 25 weeks of gestation, with some incomplete formations noted.
Conclusions:
- Retinal vascular development, including RPCs and the macular capillary-free zone, follows a predictable timeline in relation to gestational age.
- The macular capillary-free zone likely develops secondary to capillary retraction.
- Vascular anomalies in the macula may result from vessel anastomosis.
Abstract:
27 eyes of 20 premature and full-term infants were subjected to trypsin digestion, and a study was made of the extension of the temporal retinal vessels and of the formation of the radial peripapillary capillaries (RPCs) and the capillary-free zone in the macula. The advancing borders of the temporal retinal vessels exhibited a V-shaped appearance in cases of 23-29 weeks in gestational age. The RPCs were observed in cases after the 27th week of gestation. The capillary-free zone in the macula was observed in cases after the 25th week of gestation. There were two eyes having extremely small and incomplete capillary-free zones: in one eye a vascular network was present in the region corresponding to the center of the macula. It was thought that the vascular network in the temporal horizontal aspect of the macula is formed by anastomosis of the superior and inferior temporal vessels, and that the capillary-free zone in the macula develops secondarily as the result of retraction of the capillaries.