Abstract: A refraction device includes a main body, a spherical power lens coupled to the main body, an astigmatic power lens movably coupled to the main body, and a visual display coupled to the main body and oriented toward an optical pathway extending through the spherical power lens and the astigmatic power lens. The visual display is configured to display an image for testing visual acuity.
October 17, 2017
Date of Patent:
February 18, 2020
Richard James Mackool, Richard Jonathan Mackool, Brice Kaleski, Robert R. Towle, Evan Rittenhouse Jones, Christopher Dean Smith