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Reichert® Introduces LEA SYMBOLS® and LEA NUMBERS® on ClearChart® 4X/4P

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July 15,2019

Reichert® is pleased to announce that ClearChart® 4X Enhanced Digital Acuity System and ClearChart® 4P Polarized Digital Acuity System now contain LEA SYMBOLS® and LEA NUMBERS® optotypes. These optotypes are considered the standard for pediatric acuity testing and are calibrated in accordance with the Landolt C optotype series. LEA SYMBOLS are easier for children to identify and both new sets of optotypes blur equally when presented to the patient. 

Effective immediately, all ClearChart 4X and ClearChart 4P Digital Acuity Systems will feature LEA SYMBOLS and LEA NUMBERS.

Compatibility with existing Reichert Phoroptor® VRx Digital Refraction System and SightChek™ Digital Phoroptor® is possible with a software update. Please contact Reichert Technical Support or your local Reichert Authorized Distributor to arrange a software update for your digital refraction system.

To learn more about Reichert’s ClearChart 4X and ClearChart 4P with LEA SYMBOLS and LEA NUMBERS visit or email

About Reichert Technologies

Reichert Technologies of Buffalo, New York, is a global leader in designing, engineering, and manufacturing high-quality diagnostic devices and equipment for ophthalmologists, optometrists, opticians, and retail eye centers.

Inventor of the Phoroptor®, Lensometer®, and Non-Contact Tonometer, Reichert continues its 150 year tradition of providing innovative products, with the digital Phoroptor® VRx, Tono-Pen® Tonometer, ClearChart® Digital Acuity Systems, and the break-though in glaucoma diagnosis and management, Ocular Response Analyzer® featuring Corneal Hysteresis and IOPcc. 

Reichert Technologies is a unit of AMETEK Ultra Precision Technologies, a division of AMETEK Inc., which a leading global manufacturer of electronic instruments and electromechanical devices, with annual sales of approximately $5.0 billion.

LEA SYMBOLS and LEA NUMBERS are registered trademarks of LEA Test, Intl, LLC.

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