Health & Fitness

Important Parameters To Understand Your Contact Lens Prescription

Contact lenses play a prominent role in improving vision. But buying contact lense without ophthalmologist written prescription is not a good deal. Even the best contact lenses will not fit on your eyes and can adversely affect eye health. Because contact lenses detail changes with the wearer’s age. Therefore, every contact lenses wearer needs to understand the important parameters of prescriptions before buying contacts.

What you will read here:

  • Why do you need a Good contact lense Prescription?
  • Knows the Basic Details to Understand Your Contact Lens Prescription
  • Base Curve (BC):
  • Power/Sphere (PWR/SPH/D):
  • Average (DIA)
  • Cylinder (CYL)
  • Addition (ADD)
  • Axis (A/ACH/AXIS/AX)
  • When Your contact lens prescriptions expire?
  • What is the difference between Contact Lens prescription and spectacle prescription?
  • Where you can buy contact lenses?
  • Bottom Line

Why do you need a Good contact lense Prescription?

In some countries, it is illegal to buy and sell contact lenses without an ophthalmologist prescription. This can be due to poor quality and ill-fitted contacts damage wearer’s eyes. Besides this inflammation, infection, discomfort, vision issue, and abrasion are other common issues.

Contact lenses are also not recommended for sharing. Because these can lead to sight-threatening eye infections and diseases to deteriorate eye health

Knows the Basic Details to Understand Your Contact Lens Prescription

There are many codes and figures prescribed by a doctor on your contact lens prescription. follow this guide to read your contact prescription

• Base Curve (BC):

It refers to the back curvature of the contact lens, which lies between 8 to 10 mm. This number is important for contacts to know how much correction your vision needs to function properly. If your prescription does not include BC details, do not worry. There is a possibility that your branded contact lens comes in a single base curve only.

• Power/Sphere (PWR/SPH/D):

This figure indicates your vision correction level. Powe is indicated by + and – sign. + indicates farsighted or hyperopia issue and – show nearsighted or myopia eye trouble. Measure a range of farsighted and nearsighted ranges between 0 to 0.25, higher the level means more vision correction required.

Average (DIA)

DIA indicates lens diameter in mm. Soft and hard lenses have different diameter values. Like 9 to 10 mm value ranges for hard lenses and 13.00 to 15.00 mm is for soft lenses.

Cylinder (CYL)

This value is required for astigmatism contact lenses wearer. It is in negative value that makes curvature of the cornea correction. So, astigmatism patients can see values in prescription with an Axis. E.g. Left eye: -2.25, Right eye: -2.25.

Addition (ADD)

The dioptric value of the far vision and the dioptric value of the near vision difference is called ADD. These values are considered in the form of 1.25 (low), 2.00 (moderate), and 3.00 (high).


The axis describes the exact position of the curvature on the cornea. It ranges from 0 to 180 degrees. 180 degree corresponds to horizontal meridian and is described in 0 range. Whereas 90 means the vertical position of the eye. These directions are added to the contact lens to correct your astigmatism.

When Your contact lens prescriptions expire?

Contact lenses prescriptions are valid for one year, and the doctor writes expiry date on them. Therefore, when it is expired, you will not be eligible to buy contacts without the next prescription. The doctor conducts your complete eye examination and ensures changed lenses will not affect the wearer’s eyes.

Even after complete diagnose, wearer suffering from eye problems. It will be better to discontinue wearing contacts and take suggestions from the doctor. Sometimes, doctor shift contacts from extended lenses to weekly disposable contacts. Frequent replacement in contacts helps you to solve the problem.

What is the difference between Contact Lens prescription and spectacle prescription?

Contact Lens and spectacles prescriptions completely different from each other. Glasses are placed 12 mm away from your eyes and contacts directly inserted into the eyes surface. Therefore, each prescription is determined based on eye reflection power. Also, a contact lens prescription contains special details conducted after complete eye examination like fitting, which is not included on a glasses prescriptions.

NOTE: If you wear glasses and contacts, be careful and do not mix both prescriptions.

Where you can buy contact lenses?

Once you get proper fit contacts from the doctor, you will get the right prescription for your lenses. Then you can buy your favorite brand’s contacts a wide variety of sources. Bear in mind, always use prescription while ordering from online or offline resources. You are not always required to buy contacts from your eye doctor.

Bottom Line

Contact lenses sized varies from brand to brand, just like your shoes and clothes. Therefore, it is essential to show your contact lens prescription to the manufacturer before ordering your size lenses. If you found any issue, you can consult with the doctor for reliable advice.

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