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Many ready-made reading spectacles fail the required standards.

David B Elliott1, Alison Green

  • 1Bradford School of Optometry and Vision Science, University of Bradford, Bradford, United Kingdom. d.elliott1@bradford.ac.uk

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|February 14, 2012
PubMed
Summary
This summary is machine-generated.

Many ready-made spectacles (RMS) fail international optical quality standards, particularly higher-powered ones. This study found significant induced prism in RMS, suggesting a need for stricter manufacturing and sales regulations for improved vision correction.

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Area of Science:

  • Optometry
  • Ophthalmology
  • Optical Engineering

Background:

  • Ready-made spectacles (RMS) offer accessible vision correction for presbyopia.
  • International standards, such as ISO 16034:2002, aim to ensure the optical quality of RMS.
  • Previous assessments have indicated variability in the quality of available RMS.

Purpose of the Study:

  • To evaluate the optical quality of near-vision RMS against ISO 16034:2002 standards.
  • To identify specific optical defects in RMS that may compromise visual performance.
  • To compare RMS quality against both international and more lenient standards.

Main Methods:

  • A random sample of 322 near-vision RMS with powers of +2.50, +3.00, and +3.50 DS was collected from retail stores.
  • Optical quality assessments were performed on each RMS.
  • Results were benchmarked against ISO 16034:2002 and standards used in low-resource settings.

Main Results:

  • 48% of tested RMS failed to meet international optical quality requirements.
  • Higher power spectacles (+3.50 DS) showed a higher failure rate (62%).
  • Induced horizontal (60%) and vertical prism (32%) were the primary reasons for non-compliance, often due to excessive centration distances.

Conclusions:

  • A significant prevalence of induced prism exists in higher-power near-vision RMS, impacting optical quality.
  • Restricting the sale of RMS to lower powers (+1.00 to +2.50 DS) could reduce error rates.
  • Manufacturers should adopt near interpupillary distances for RMS centration to improve accuracy.