A Comparison of Keystone and Titmus Vision Screeners for Occupational Health Vision Testing Comparing similarly priced Keystone and Titmus vision screening equipment, the Keystone VS-V vision screener and the Titmus i200 vision tester. Tests. Both the Keystone and Titmus test: binocularity, acuity right, acuity left, depth perception, color perception and vertical balance. Peripheral. The Keystone...
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