Fig. 4

a SD-OCT machine: a low-coherence near-infrared beam is split such that it is directed at both the sample and a reference mirror. The beam is reflected from reflective surfaces (cellular interfaces) in the sample and from the reference mirror. b In the spectrometer, the recombined beams undergo Fourier transformation, and the resulting interference is detected by the detector array. Signals are processed to form OCT images. c) OCT scan of the left eye of a child aged 15 months. Hyperreflective capillaries (pale yellow arrows), hyperreflective areas (long white arrows) and haemorrhage (black asterisk) are visible