The pupil controls the amount of light entering the eye. We hone examined both the time, cow-se for the development of the light reflex and pupil diameter before and after this reflex development in fifty neonates. The pupil light reflex was absent in all neonates of less than 30 weeks gestational age, but it gradually developed from this age and by 35 weeks it was present in all. Several possible mechanisms that may explain the onset of this reflex are considered.. Before the onset of the pupil reflex the mean pupil diameter was 3.46 mm. compared with 3.02 min. after the reflex development |
