Pupil responses to near visual demand during human visual development.

Shrikant R. Bharadwaj, Jingyun Wang, T. Rowan Candy

Research output: Contribution to journalArticlepeer-review


Pupil responses of adults to near visual demands are well characterized but those of typically developing infants and children are not. This study determined the following pupil characteristics of infants, children and adults using a PowerRefractor (25 Hz): i) binocular and monocular responses to a cartoon movie that ramped between 80 and 33 cm (20 infants, 20 2-4-yr-olds and 20 adults participated) ii) binocular and monocular response threshold for 0.1 Hz sinusoidal stimuli of 0.25 D, 0.5 D or 0.75 D amplitude (33 infants and 8 adults participated) iii) steady-state stability of pupil responses at 80 cms (8 infants and 8 adults participated). The change in pupil diameter with viewing distance (Δpd) was significantly smaller in infants and 2-4-yr-olds than in adults (p <0.001) and significantly smaller under monocular than binocular conditions (p

Original languageEnglish (US)
Pages (from-to)6
Number of pages1
JournalJournal of Vision
Issue number4
StatePublished - 2011
Externally publishedYes

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

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