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Articles, Learning Materials
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To facilitate reliable visual acuity screening for clinical trials and exchange of patient data between doctors, clinics and researchers throughout Europe and beyond, researchers at the University of Crete (Dr. Sotiris Plainis, Prof. Miltiadis Tsilimbaris and Prof. Ioannis Pallikaris), have developed modified ETDRS charts that contain only capital letters that are common to all three European alphabets (Latin, Greek, Cyrillic), and are thus recognizable for a much wider population as indicated in the map below.
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Learn More about MassVAT®
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Since the 1970’s Precision Vision has built a reputation of producing the most accurate and most durable vision testing tools available. In the 1980’s they printed the first ETDRS cards and produced the standard ETDRS illuminator cabinet. Since the early 1990’s they have carried a variety of Low Vision and pediatric testing tools.
by August Colenbrander, MD - San Francisco
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What Dr. Herman Snellen did for the field of vision testing is comparable to what the first automobile engineers did to revolutionize the car industry. These pioneers saw a need for change and additional resources at a time when people were yearning for better quality and higher standards of living in their day-to-day experiences.
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When Dr. Herman Snellen developed the famous, ground-breaking Snellen visual acuity test in 1862, he launched a defining movement in the vision testing field that would be followed by eye care practitioners to this day. Snellen’s innovations were critical.
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Snellen designed his optotypes on a 5x5 grid, on which the line thickness is one unit and the letter width and height are five units. This system is followed for most letter and number charts. For children’s tests (such as Allen pictures and other test symbols), it is often abandoned and much thinner lines are used. Precision Vision offers stylized pictures, called Patti Pics, for which Snellen’s 5x5 principle is followed.
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Learn about the Patti Pics™ Vision Testing System
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PVVAT™ is a state-of-the-art computerized visual acuity software program designed and built by experts with uncompromised attention to detail.
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Our team at Precision Vision® has pioneered cutting-edge tools for vision testing for nearly 40 years. We continue to be the undoubted market leader in the field of new product development. Our focus on Contrast Sensitivity is making industry professionals take note of our accomplishments. We are recognized as the top manufacturer of low-contrast products.
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