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Related Experiment Videos

Screening for refractive errors with the Topcon PR2000 Pediatric Refractometer.

C Williams1, R Lumb, I Harvey

  • 1Dept. of Ophthalmology, Bristol Eye Hospital, United Kingdom. cathy.williams@bristol.ac.uk

Investigative Ophthalmology & Visual Science
|February 7, 2001
PubMed
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The PR2000 photorefractor accurately screens preschool children for refractive errors like anisometropia, though it underestimates hypermetropia without cycloplegia. Its repeatability is good for sphere and acceptable for astigmatism.

Area of Science:

  • Ophthalmology
  • Pediatric Optometry
  • Vision Science

Background:

  • The PR2000 is a photorefractor used for screening preschool children's vision.
  • Previous studies have compared different screening methods in this age group.

Purpose of the Study:

  • To evaluate the accuracy of the PR2000 photorefractor in a clinical setting with children under 8 years old.
  • To compare the PR2000's performance against cycloplegic retinoscopy.

Main Methods:

  • 222 children under 8 years underwent PR2000 examination without cycloplegia.
  • All participants subsequently had retinoscopy performed with cycloplegia by an independent examiner.

Main Results:

  • The PR2000 provided readings for 90% of eyes, with 5% out of range.

Related Experiment Videos

  • It underestimated hyperopic refractive errors and astigmatism compared to retinoscopy.
  • Sensitivity and specificity for anisometropia detection were 91% and 92%, respectively.
  • Repeatability was good for sphere (ICC=0.74) and moderate for astigmatism (ICC=0.59).

    • Conclusions:

    • The PR2000 is a valuable screening tool, particularly for detecting anisometropia.
    • It demonstrates good repeatability for refractive error measurements.
    • The device underestimates hyperopic errors when cycloplegia is not used.