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Related Experiment Videos

Low vision magnifiers--their optical parameters and methods for prescribing

I L Bailey1, M A Bullimore, R B Greer

  • 1School of Optometry, University of California, Berkeley.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|November 1, 1994
PubMed
Summary

Clinicians can now accurately predict low vision magnifier performance using new optical parameter tables. These tables detail stand and hand-held magnifiers, aiding selection for improved patient visual resolution.

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Optometrist or specialist?

Optometry and vision science : official publication of the American Academy of Optometry·2001

Area of Science:

  • Ophthalmology
  • Optometry
  • Low Vision Rehabilitation

Background:

  • Manufacturer data for low vision magnifiers often lacks detail for accurate clinical prediction of resolution improvement.
  • Objective optical parameter measurement is needed to guide magnifier selection for patients with low vision.

Purpose of the Study:

  • To measure and tabulate key optical parameters for a range of stand and hand-held magnifiers.
  • To provide clinicians with data for predicting patient resolution improvement and optimizing magnifier choice.

Main Methods:

  • Measured and tabulated optical parameters for 92 stand and 53 hand-held magnifiers.
  • Calculated Equivalent Viewing Distance (EVD), image location, and field width for stand magnifiers at various eye-to-lens distances.
  • Measured equivalent powers for hand-held magnifiers.

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Main Results:

  • Provided detailed optical data, including EVD, for 92 stand and 53 hand-held magnifiers.
  • Stand magnifiers are listed by EVD at a 10 cm eye distance.
  • Hand-held magnifier EVD is equivalent to focal length when the image is at infinity.

Conclusions:

  • The generated tables offer crucial data for clinicians to predict magnifier performance and select appropriate devices for individual low vision patients.
  • Equivalent Viewing Distance (EVD) is a key metric for predicting visual resolution capabilities.
  • Supplementary data on size and lighting aids in comprehensive magnifier selection.