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Contact lens electroretinography in preterm infants from 32 weeks after conception: a development in current
H Mactier1, R Hamilton, M S Bradnam
1Department of Child Health, Royal Hospital for Sick Children and Queen Mother's Hospital, Yorkhill NHS Trust and University of Glasgow, Glasgow G3 8SJ, Scotland, UK. HelenMactier@hotmail.com
Aim:
To assess the feasibility of using a contact lens electrode to record the electroretinogram (ERG) in preterm infants less than 35 weeks after conception.
Methods:
The ERG was recorded from seven very low birthweight preterm infants on a total of 14 occasions using an infant monkey contact lens electrode. Age at recording the first ERG ranged from 23 to 51 days (gestational age 32-34 weeks), and weight ranged upwards from 1100 g.
Results:
No complications were observed. With advancing age and maturity the dark adapted rod threshold decreased, indicating increased retinal sensitivity.
Conclusions:
Contact lens recording of the ERG from extremely small immature preterm infants is a practicable and well tolerated procedure. This method of recording the ERG will enable further evaluation of retinal development in this vulnerable population.
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