In some instances, your optometrist may have written your CYL and AXIS freehand which can be separated by an “X”.įor example: CYL 1.50 x 060. These digits can be anywhere between 0 and 180 degrees such as 020, 090, 120 or 170 etc. These digits are inter-related and are both used to correct your astigmatism in either or both of your eyes.ĪXIS refers to the angle of the astigmatism in your eye and has nothing to do with the severity of your prescription. If your prescription CYL box contains a value, so will your AXIS box. However, this condition is extremely common and it’s likely you’ll have slight astigmatism in at least one of your eyes.Ĭylindrical power is written as a positive (+) or negative (-) value which refers to the dioptres requires to correct myopic or hyperopic astigmatism.Įxample of right eye Axis prescription | 180 degrees from meridian If your CYL boxes are empty for either of your eyes, this means you have no astigmatism and therefore no requirement for any AXIS either. This is shorthand for cylinder where numerical digits are only required if you have astigmatism in either or both of your eyes. Ultra thin: SPH +/-7.00-9.00 &/or CYL +/-2.25-6.00Įxample of right eye Cyl prescription | Minus Cyl | -0.25įollowing the SPH box on your prescription will be CYL.To calculate the cost of your prescription lenses, click here.įor aesthetics and for weight, here’s a guide on what thickness of lenses to choose based on your prescription. If your SPH is stronger than +/-4.00, you should consider using high index lenses as they can be very thick and protrude from the rim of your glasses frame. Regardless of the (+) or (-), the higher the number, the stronger the power of your lenses. Zero SPH (0.00) means you have no refractive error. Negative SPH means you have myopic (near-sighted) when you can see objects near to you clearly, but objects far away are blurry. Positive SPH means you're hyperopic (far-sighted) when you can see objects far away clearly, but close objects are blurry. SPH is measured in dioptres and can be written as positive (+) or negative (-) values for each of your eyes. SPH is shorthand for sphere and refers to the required power of your lenses to correct either short or long sightedness. I’ve deciphered and explained each of them for you in the correct order, listed in the sections below.Įxample of right eye Sphere prescription | Positive SPH | +2.50 On your prescription paper you’ll see various shorthand terminologies. SPH | CYL | Axis | Add | Prism | Plano | OD | OS | OU | Prescription enititlement | Missing your PD To fast track, click a terminology in the link-box below. In this handy article, I wanted to explain what this all means. Understanding your eye test results can seem borderline foreign.Īll those digits and details have so much importance but so little meaning when you see unfathomable terms like Sph, Cyl, Axis or Prism.īut on your prescription paper, it’s these digits that inform how your lenses are shaped, angled and cut they’re visually vital.
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