Mars Perceptrix Corporation makes handheld contrast-sensitivity tests for clinical vision care, low-vision assessment, occupational testing, and research. Its letter and numeral charts measure the lowest contrasts a patient can perceive rather than simply testing visual acuity, using 48 gradually declining contrast levels and scoring that generally takes less than a minute per eye. The company’s numeral version also provides a more language-neutral option for people less familiar with the Western alphabet.
VectorVision Ocular Health (DBA: VectorVision)Founded by vision scientist David W. Evans, Ph.D., VectorVision makes standardized vision-testing instruments for measuring visual function in eye-care practices and clinical research. Based in Greenville, Ohio, the company has spent 30 years developing patented systems such as the CSV-1000, CSV-2000 and ESV-3000, which automatically control testing luminance for consistent results. Its equipment is used in more than 60 countries, 5,000 eye-care clinics and more than 50 FDA clinical trials.GREENVILLE, OH
Titmus, LLCSince introducing its OV7 vision screener in 1959, Titmus, LLC has manufactured vision-screening instruments in the USA, including its durable stereoscopic V Series and the tablet-controlled Kaleidos autorefractive screener. Its instruments serve settings ranging from schools and pediatric offices to occupational, aeromedical, and driver testing, with the Kaleidos completing a screening in about three seconds. Titmus says older OV7 and Model 2 screeners remain in use nationwide.FULTON, MD
Accommodata CorporationSince 1994, Accommodata Corporation has made Stimuli computerized vision-testing systems for doctors worldwide. The company is particularly distinctive for its pediatric systems, which use a second operator-facing monitor to help clinicians keep young patients engaged without turning away, and it continues to support Stimuli models across its 30-year history with updates and technical assistance.EUCLID, OH
Diopsys, IncDiopsys, Inc. develops the NOVA™ Vision Testing System, an in-office electrophysiology platform that measures functional activity across the visual and neuro-visual pathways. Based in Middletown, Pennsylvania, the company’s systems provide objective ERG and VEP testing to help clinicians detect disease earlier, monitor retinal function, and inform treatment decisions.MIDDLETOWN, PA