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Automated solid-state refracting device with spherical and cylindrical power range, range of Snellen charts for binocular exams needed to determine if candidates meet aviation standards. Refractor mus... Automated solid-state refracting device with spherical and cylindrical power range, range of Snellen charts for binocular exams needed to determine if candidates meet aviation standards. Refractor must have capability that offers prism in increments suited for aviation standards. LCD Acuity Chart System. RT-6100 Digital Refractor (3 units)