Pediatric Vision Screener 1: Instrument design and operation

David G. Hunter, Deborah S. Nassif, Nadya V. Piskun, Robert Winsor, Boris I. Gramatikov, David L. Guyton

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


We develop the Pediatric Vision Screener (PVS) to automatically detect ocular misalignment (strabismus) and defocus in human subjects. The PVS utilizes binocular retinal birefringence scanning to determine when both eyes are aligned, with a theoretical accuracy of <1 deg. The device employs an autoconjugate, bull's-eye detector-based system to detect focus. The focus and alignment pathways are separated by both wavelength and data acquisition timing. Binocular focus and alignment are detected in rapid alternating sequence, measuring both parameters in both eyes in <0.5 sec. In this work, the theory and design of the PVS are described in detail. With objective, automated measurement of both alignment and focus, the PVS represents a new approach to screening children for treatable eye disease such as amblyopia.

Original languageEnglish (US)
Pages (from-to)1363-1368
Number of pages6
JournalJournal of biomedical optics
Issue number6
StatePublished - Nov 2004


  • Amblyopia
  • Eye
  • Polarization optics
  • Retinal birefringence
  • Strabismus
  • Vision screening

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering


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