Because diopters add, the same prescriptions can have two forms. Cylinder can be always positive {plus-cylinder form}.
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.
4-Medicine-Medical Examination-Eye Exam
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Date Modified: 2022.0225