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At Lensmakers Optical we provide friendly, professional, and individualized service to all our customers. We believe that good service should be available to everyone at an affordable price that represents the products and services offered. With competitive offers and a genuine passion for the business, Lensmakers Optical is a one-stop shop for all your eyewear needs.

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Frenzelglasses nystagmus

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Objective: To develop and evaluate new thin and light glasses for the examination of patients with nystagmus and to compare them with Frenzel goggles.

(A) Frenzel goggles, a commercially available tool for the examination of nystagmus: magnification by glass spectacle lenses about 16 diopters, dimensions approximately 20 × 13 × 7 cm, and weight approximately 500 g. (B) The takeaway Frenzel goggles, a Fresnel-based device, is a newly designed tool for the bedside examination of nystagmus: magnification by Fresnel plastic lenses about 16 diopters, dimensions 12 × 8 × 0.3 cm, and weight 6 g. (C) Schematic drawing showing comparison of Fresnel lenses (left) and regular lenses (right) to illustrate the basic principle of Fresnel lenses, which leads to the smaller dimensions.

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Frenzel lensesvestibular

Inspired by the need for well-priced eyewear for everyone, Lensmakers Optical has always maintained a passion for optics and housed a family of eyeglass experts. Founded in 1994 in Kamloops, British Columbia, Lensmakers Optical has provided the community with friendly, professional, and individualized service for 25 years.

At Lensmakers Optical we provide fittings for eyewear and contact lenses. We also carry a large range of the latest styles of eyeglass frames and sunglasses. Our onsite lab means that we offer one-hour service on a limited selection of single vision lenses.

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Results: The Fresnel-based device weighs 6 g (dimensions 12 × 8 × 0.3 cm). There was no significant difference in the intensity of postrotatory nystagmus between the Fresnel-based device with 4-fold magnification (37.3 ± 17.9°/s) and the Frenzel goggles (39.0 ± 18.3°/s). There was also no significant difference between the intensity of peripheral vestibular spontaneous nystagmus in the patients with acute vestibular neuritis. The Fresnel-based device can be easily applied.

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It has always been our business to bring the best vision to all our customers with competitive offers and great service for everyone. With a full selection of lens products and a wide range of prices, Lensmakers Optical has the perfect eyewear solution for everyone!

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Plotting the mean peak slow-phase velocity (mSPV) measured with the Fresnel-based device with the 4-fold magnification (y) and Frenzel goggles in 6 patients with spontaneous peripheral nystagmus suggests a linear relation. This indicates that the fixation suppression achieved by the Fresnel-based device is constantly 0.69 times that of the Frenzel goggles, irrespective of the intensity (mSPV) of the spontaneous nystagmus.

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We believe in going the extra mile with professional and individualized service. When you purchase eyeglasses for the first time, we give you a free bottle of cleaning spray that we will refill, at no cost, whenever needed. We also offer free cleaning, adjustments, and minor repairs for all our customers and their families.

Methods: First, we designed new examination glasses: a Fresnel-based device with a short focal length that is not as heavy or bulky as Frenzel goggles. Second, visual-fixation suppression of postrotatory nystagmus with Frenzel goggles and the Fresnel-based device, the latter with 2 different magnifications (2- and 4-fold), was compared in 13 healthy subjects. Third, the intensity of the peripheral vestibular spontaneous nystagmus–in 6 patients with acute vestibular neuritis–with the Frenzel goggles and the Fresnel-based device with the 4-fold magnification was compared. Fourth, the visibility and clinical applicability were evaluated.

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Conclusion: For suppression of nystagmus, the new Fresnel-based device or so-called M glasses is not inferior to Frenzel goggles. Doctors can carry it in their pocket, it is inexpensive, and easy to handle and to fix to the patient’s nose so that it can be used in daily practice for the bedside examination.