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Related Experiment Videos

Quantifying relative afferent pupillary defects using a Sbisa bar.

A McCormick1, R Bhola, L Brown

  • 1Department of Ophthalmology and Orthoptics, A floor, Outpatients, Royal Hallamshire Hospital, Glossop Road, Sheffield S10 2JF, UK. austin@austinmccormick.demon.co.uk

The British Journal of Ophthalmology
|August 20, 2002
PubMed
Summary

The Sbisa bar effectively quantifies relative afferent pupillary defects (RAPD), showing high correlation with neutral density filters (NDF). This makes the Sbisa bar a practical clinical tool for RAPD measurement.

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Area of Science:

  • Ophthalmology
  • Neuro-ophthalmology

Background:

  • Relative afferent pupillary defect (RAPD) is a key indicator of optic nerve dysfunction.
  • Accurate quantification of RAPD is crucial for diagnosis and monitoring of visual pathway disorders.
  • Neutral density filters (NDF) are commonly used to measure RAPD.

Purpose of the Study:

  • To compare the efficacy of the Sbisa bar (Bagolini filter bar) with traditional neutral density filters (NDF) in quantifying relative afferent pupillary defects (RAPD).

Main Methods:

  • 11 patients with RAPD were assessed using both the Sbisa bar and NDF bar.
  • Luminance values for each filter were measured to allow for direct comparison.
  • Clinical grading of RAPD was performed with each device.

Main Results:

Related Experiment Videos

  • A high correlation (r = 0.95, p < 0.001) was observed between the Sbisa bar and NDF bar in quantifying RAPD.
  • Correlation remained high (r = 0.92, p < 0.001) even when using substituted luminance values.
  • The Sbisa bar demonstrated statistically significant comparability to NDFs.

Conclusions:

  • The Sbisa bar is a comparable and practical instrument for measuring RAPD.
  • Its availability and ease of use make it a viable alternative to NDFs in clinical settings.
  • The findings support the use of the Sbisa bar in routine ophthalmological practice.