
CHF35.90 CHF1.20/1Piece
Dailies Total1 for Astigmatism
Dailies Total1 for Astigmatism
The question is whether the cylinder values should not be negative, dioptres always go in both directions... Thank you
According to our supplier, the cylinder values are positive. For spectacle prescriptions, the cylinder values (CYL) are normally negative. With contact lenses, however, the cylinder values can be both positive and negative. This is because contact lenses sit directly on the eye and are therefore constructed differently to spectacles. Some contact lens manufacturers use negative cylinder values, while others use positive values, depending on which notation system is used.