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Related Experiment Videos

Visolett magnifier without and with bifocal.

G E Fonda1

  • 1Saint Barnabas Low Vision Center, West Orange, NJ 07052.

Ophthalmology
|September 1, 1989
PubMed
Summary
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Visolett magnifiers offer enhanced vision with simple, binocular use. These optically designed paperweights provide significant magnification, making them a preferred alternative to stand magnifiers for improved visual clarity.

Area of Science:

  • Ophthalmology
  • Optics

Background:

  • Visolett magnifiers are unique, optically designed paperweights.
  • They function as non-focusable magnifiers with specific optical properties.

Purpose of the Study:

  • To describe the optical characteristics and advantages of Visolett magnifiers.
  • To compare Visolett magnifiers with traditional hand-held and stand magnifiers.

Main Methods:

  • Analysis of the optical design of Visolett magnifiers.
  • Comparison of magnification properties with varying dioptric power and object distance.
  • Evaluation of user benefits such as ease of use and binocular vision.

Main Results:

  • General magnification is 1.8X (2.47X with glass index 1.806), with bifocal magnification up to 4X.

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  • Magnification does not increase with dioptric power, unlike other magnifiers.
  • Bifocal magnification increases with dioptric power and decreased object distance.

    • Conclusions:

    • Visoletts offer advantages like simplicity, binocular vision, and illumination concentration.
    • They are considered superior to stand magnifiers and useful for augmenting spectacle magnifiers.