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Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes
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Modified bell retinoscopy: measuring accommodative lag in children.

Kristina Tarczy-Hornoch1

  • 1Division of Ophthalmology, Childrens Hospital Los Angeles, Los Angeles, California 90027, USA. ktarczyhornoch@chla.usc.edu

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|October 3, 2009
PubMed
Summary

Modified Bell Retinoscopy (MBR) effectively quantifies accommodative lag in children, showing good repeatability and comparability with other methods. This technique offers a valuable tool for assessing accommodation in young patients.

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Area of Science:

  • Ophthalmology
  • Pediatric Optometry
  • Vision Science

Background:

  • Accurate assessment of accommodative lag is crucial for understanding visual development in children.
  • Existing methods for measuring accommodative lag may have limitations in repeatability and comparability.

Purpose of the Study:

  • To introduce and describe the Modified Bell Retinoscopy (MBR) method for quantifying accommodative lag in pediatric populations.
  • To evaluate the repeatability and comparability of MBR with established techniques like Nott Retinoscopy (NR) and the Monocular Estimate Method (MEM).

Main Methods:

  • MBR involves advancing a target until the retinoscopic reflex is neutralized, with lag estimated using a standardized 40-cm target.
  • Repeatability was assessed within-visit and between-visit in normal children, clinic patients, and children with Down syndrome.
  • Comparisons were made with NR and MEM in a subset of clinic patients.

Main Results:

  • MBR demonstrated strong correlations with NR (r=0.84) and MEM (r=0.82).
  • Repeatability varied with the amount of accommodative lag, with a repeatability index of 0.49 D for 0.50 D lag and 0.80 D for 1.00 D lag.
  • Repeatability was consistent across different age groups and refractive errors, and similar in children with Down syndrome.

Conclusions:

  • MBR provides reliable estimates of accommodative lag, correlating well with traditional dynamic retinoscopy measures.
  • The method exhibits comparable repeatability to existing techniques, making it a potentially valuable clinical tool.
  • MBR may enhance the assessment of accommodation in young children, aiding in early detection and management of visual issues.