Because diopters add, the same prescriptions can have two forms. Cylinder can be always negative {minus-cylinder form}. For minus-cylinder form, Sphere is higher, and Axis is 90 degrees less or more than plus-cylinder form.
Biological Sciences>Medicine>Medical Examination>Eye Exam>Cylinder
4-Medicine-Medical Examination-Eye Exam-Cylinder
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224