Understanding your glasses prescription may seem confusing at first, but once you know what each term means, it becomes much easier to choose the right lenses, especially when ordering glasses online.
In this guide, we’ll break down the most important parts of your prescription: SPH, CYL, and AXIS.
What Does SPH (Sphere) Mean?
SPH, or Sphere, indicates the strength of your lens needed to correct your vision.
- A minus (-) value means you are nearsighted (myopia), which makes distant objects appear blurry.
- A plus (+) value means you are farsighted (hyperopia), making close objects harder to see.
For example:
- SPH -2.00: mild nearsightedness
- SPH +1.50: mild farsightedness
The higher the number, the stronger the prescription you need.
What Is CYL (Cylinder)?
CYL refers to astigmatism, a common condition where the eye does not focus light evenly.
If your prescription includes a CYL value, it means you need additional correction for blurred or distorted vision.
- CYL values can be either minus (-) or plus (+)
- If CYL is blank or zero, you likely don’t have astigmatism
Example:
- CYL -1.25: moderate astigmatism correction
What Is AXIS?
AXIS works together with CYL to correct astigmatism. It indicates the orientation (angle) of the correction needed.
- AXIS is measured from 0 to 180 degrees
- It does not exist without a CYL value
For example:
- CYL -1.00 AXIS 90: correction is applied at a 90-degree angle
Why This Matters When Buying Glasses and Contact Lens Online
Knowing how to read your prescription helps you:
- Choose the correct lenses confidently
- Avoid ordering the wrong prescription
- Understand your vision needs better
When shopping for glasses online, you’ll usually be asked to input SPH, CYL, and AXIS values exactly as written on your prescription.
Not sure which frame to choose? Try a classic style like:
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Quick Tips Before Ordering
- Always double-check your prescription values
- Make sure your prescription is up to date
- Ask your optician if anything is unclear
Understanding your glasses prescription doesn’t have to be complicated. Once you know what SPH, CYL, and AXIS mean, you can shop for eyewear with confidence and get the clear vision you need.
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FAQ
What does SPH mean in a prescription?
SPH indicates whether you are nearsighted (-) or farsighted (+) and the strength of correction needed.
What is CYL in glasses?
CYL measures astigmatism and shows how much lens power is needed to correct it.
What is AXIS in eye prescription?
AXIS defines the angle of astigmatism correction, ranging from 0 to 180 degrees.
Can I buy glasses online with my prescription?
Yes, as long as you correctly input your SPH, CYL, and AXIS values, you can safely order glasses online.