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This is your main power and is a + or - number or 0
It is an additional plus power in the lower portion of a bifocal/progressive lens that is required for near vision. It is usually a + power (like +1.5, +2.5 etc.)
Not all powers have a cylinder(CYL) component, in which case leave it blank
If you have Cylindrical power, You will have an axis i.e. angle view (between 1 and 180)
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