Phoropter GD8704 is a wrapped model, offers a traditional Topcon similar design
Digital phoropter GD8800 offers keyboard control refraction test
GD8702A: A grade lens and components; GD8702: AB grade lens and components;
Grey & Black outside color for option
GD8802: Digital Vision Tester; GD8601: LCD Visual Chart.
GD8700A: High quality, with A grade lens and parts; GD8700: Economic design, with AB grade lens and parts; Grey & Black outside color for option