Good-Lite Company

Elgin,  IL 
United States
  • Booth: 1705

Come see all our new offerings, can't wait to see you!

Manufacturer of the Lea Test System including Lea Symbols, Lea Numbers, and the InfantSEE® Kit. Complete range of vision testing products including the new self-calibrating ETDRS Standardized Viewer. Cortical Vision Assessment, high and low contrast, color vision, and preferential looking tests, will be on display.

Brands: LEA Symbols, Sloan Letters, HOTV, VisuScience, NuEyes, NuCall, Chart2020, EyeSpy20/20, Good-Lite, QuikVue

 Show Specials

  • We already have the best prices in the world, but come see us at the booth and get an additonal 10% off your order! We have a new all digital ordering system, and you can even place your own orders on our newly designed website. We will have plenty of iPads on site for your convenience. Free shipping in the continental USA on all orders over $89. Are you a foreign doctor? No problem! With our new digital ordering system we can have your shipment out and to your hotel on the same day you purchase. We have also minimized our booth design to showcase only our best sellers, as well as our extensive New Product Collections. Don't see what you're loking for? Just ask, if we don't have it, you don't need it! We look forward to seeing you in the booth.

 Press Releases

  • (May 20, 2021)

    Dyop® Vision Test Basics


    Allan Hytowitz

    Vision is a dynamic process which enables us to eat rather than be eaten.  The photoreceptors in the back of the retina use the vibratory motion of the visual saccades to refresh their response which keeps the image autonomic and dynamic.

    An “optotype” is a visual target used for measuring vision.  A Dyop® (short for dynamic optotype) is a spinning segmented ring whose Black/White segments and gaps provides a strobic stimulus to the photoreceptors and can be used as a target for measuring visual acuity and refractions.  The smallest diameter Dyop ring detected as spinning is the 20/20 (or 6/6) visual acuity endpoint optimum.  As a result, a Dyop functions much as a visual equivalent of an audio tuning fork with an optimum photoreceptor stimulus refresh rate of 0.33 arc minutes squared per second.

    Item 1 – the visual angular movement/velocity for the strobic contrast response (40 RPM)

    Item 2 – a moving segmented 0.54 arc minute squared visual arc/area (MAR) for dynamically stimulating 20 retina cell clusters with motion

    Item 3 – retinal cell clusters

    Item 4 – examples of static historical optotypes

    Item 5 – the static minimum 1.0 arc minute squared angle/arc/area (MAR) of resolution/recognition for a historical optotype for 40 retina cell clusters.

    Types of Optotypes

    Dyop Components

    Historically acuity measurement was based on the concept of Resolution Acuity (the ability to detect the separation of two points such as stars) or Recognition Acuity (the ability to identify an array of European letters as devised in 1862 by Dr. Herman Snellen).  However, static optotypes counter the effectiveness of the saccades and deplete the refresh of the photoreceptors.  Because a Dyop resonates with the vibrations of the saccades, it creates a much more precise and consistent concept of Resonance Acuity

    The Adult Dyop Test has two identical diameter Dyop rings near the center of the display with only one ring as spinning.  The Children’s Dyop Test has two peripheral Dyops with only one ring as spinning.  The ring diameters are identical and the visual acuity endpoint is the diameter of the smallest Dyop ring which was detected as spinning.  To detect false positives the subject is asked whether the spinning ring was the left ring or the right ring, or whether that ring was spinning clockwise or counter-clockwise.

    The Infant Dyop Test has only ONE peripheral Black segmented Dyop on a White background which alternates its peripheral location as the Dyop diameter, or spin direction, changes.  Because of the preferential tendency for motion detection, the Infant Test and the Children’s Test can both use the motion of the subjects head and/or eyes to track the far right side or the far left side of the monitor as the peripheral location of the spinning Dyop.

    Adult Dyop Test

    Children’s Dyop Test

    Infant Dyop Test


    Using remote access software such as AnyDesk also allows acuity testing to be done successfully regardless of the differences in the computer operating system or distance between the subject and the examiner.  Color acuity testing may also be done to detect the potential for symptoms of dyslexia, migraines, or epilepsy.

    The net advantage of Dyop acuity is that it is six times as precise as Snellen testing, with one-sixth the variance, and three to four times the efficiency of Snellen testing as to acuity and refraction measurement.  A Dyop retains those advantages regardless of the age, culture, or relative lack of literacy of the subject being evaluated.  A Dyop can be used to measure acuity in color, and a Dyop can be used for measurement of less developed acuity systems such as that of an infant.


  • QuikVue
    A smartphone attachment that allows for magnified anterior segment eye imaging....

  • As imaging plays a more and more important role in ophthalmology diagnosis, the QuikVue Adaptor for smartphones was designed for anterior segment imaging.


    • 15x magnification which meets the basic eye examination demand for optometrists, general practitioners, pediatricians, veterinarians, etc.
    • Optical lens that captures clear anterior images for primary eye care examination and telemedicine.
    • White and blue illumination. The white LED projects warm white light which is similar to the slit lamp’s halogen illumination. There are two levels of white illumination available to meet different brightness demands during examination. The blue illumination can be used to capture fluorescein images to assist the diagnosis with corneal staining and contact lens fitting, etc.
    • An innovative air cushion design enables the adapter to be attached on most smart phones available in the market.
    • Mini Li-ion rechargeable battery that can be recharged through a USB cable. There is one recharging status indicator on the backside of the device. When the power recharging is finished, the indicator light will turn from red to green.
  • Chart2020 Digital Visual Acuity Software w/ DYOP
    Complete Digital VA System w/ the new DYOP...

  • Chart2020® version 10 delivers a new standard for the assessment of visual acuity, binocularity, stereo acuity, contrast sensitivity and other eye performance tests. Chart2020 offers hundreds of test options and strategies yet all easily accessed with the 45 button remote, smart menu docks, the iPad® controller and mini monitor or a click of the mouse.

    Run your exam room efficiently and accurately, adding high-tech appeal, reduce administration time, delegate, with instant reporting database for trends over time.

    Chart2020® is a monthly subscription, with pricing starting at $49 per month. the DYOP is an additional add-on starting at $49 per month. Special pricing for multi-year contracts and for annual lump sum payments.

    Email for more info
    The best way to detect Amblyopia in children...

  • Blinq (pediatric vision scanner) is the first instrument designed for vision screening programs that detect micro-strabismus and amblyopia. Using a novel new technology, Blinq conducts a 2-second Neural Performance Scan of the fovea to accurately detect binocularity associated with as little as 1-degree misalignment.

    Using proprietary retinal polarization scanning to measure bilateral Fixation via fibers of the fovea, NPS precisely measures retinal nerve fiber patterns, instantly determining if fault Fixation is present. NPS is cleared by the FDA for the screening of micro-strabismus and amblyopia (lazy eye).

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