There are some major differences between the EyeQue Personal Vision Tracker and the EyeQue VisionCheck:
Built-in Motor: When using the Personal Vision Tracker, you need to move the device away from your eyes between each of the nine measurements to rotate the dial. With the built-in motor, you would not need to remove the device from your eye until you switch from testing the right eye to the left eye.
Bluetooth and Touch Sensor Enabled: Unlike the PVT, VisionCheck has touch sensors on the device to move the lines on the screen. The touch sensors will allow you to move the lines to overlap them and continue to the next step of the vision test. With the PVT, the buttons are on your phone screen instead and do not have tactile feedback.
Improved Internal Infrastructure: With new aspheric lenses inside of the VisionCheck device, the lines on the screen are longer and thicker. This increases visibility of the lines and makes it easier to perform the test. This will help create greater accuracy and a much faster test experience.