[A variable cross cylinder with extended scale].
The graduation of the scale on the Stoke's Cylinder lens can be influenced by using an additional spherocylindrical lens for improved readability of lower-strength corrections. Furthermore, it is possible to spread the scale graduation to show a double-angle marking, again by using an appropriate spherocylindrical combination.
D002138:Calibration; D006801:Humans; D009885:Ophthalmology / Q000295:instrumentation*; D012029:Refraction, Ocular
Variabler Kreuzzylinder mit gespreizter Skala.