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What parameters can you encounter in lenses

Base Curve (BC)

What is Base Curve (BC)?
The base curve (BC) is the curvature of the back surface of a contact lens. It is measured in millimeters and typically ranges from 8.0 to 10.0. The BC ensures that the lens fits your eye properly for optimal comfort and vision.

How Do I Know My BC?
Your eye care professional will measure your eye's curvature during an eye exam to determine your correct BC. It’s important to follow their prescription to ensure the lenses fit correctly.


Diameter (DIA)

What is Diameter (DIA)?
The diameter (DIA) of a contact lens is the distance across the lens, measured in millimeters. This measurement affects how the lens sits on your eye and is crucial for ensuring a comfortable fit and clear vision.

Why is DIA Important?
A correct DIA ensures that the lens covers the correct area of your eye without shifting or causing discomfort. Your eye care professional will provide the appropriate DIA for your lenses.


Power (PWR) / Sphere (SPH)

What is Power (PWR) or Sphere (SPH)?
Power (PWR) or Sphere (SPH) indicates the lens's prescription strength, measured in diopters (D). It corrects refractive errors such as myopia (nearsightedness) or hyperopia (farsightedness).

How is Power Measured?
During an eye exam, your eye care professional will determine your prescription, which includes the power needed to correct your vision. Positive values (+) are for farsightedness, and negative values (-) are for nearsightedness.


Cylinder (CYL) and Axis

What are Cylinder (CYL) and Axis?
Cylinder (CYL) and Axis are parameters for toric lenses, used to correct astigmatism. CYL indicates the lens power for astigmatism, while Axis specifies the orientation of the astigmatism correction.

How Do I Know My CYL and Axis?
Your eye care professional will measure the degree and orientation of your astigmatism during an eye exam to provide the correct CYL and Axis values for your lenses.


Add Power (ADD)

What is Add Power (ADD)?
Add Power (ADD) is used in multifocal lenses for presbyopia correction. It indicates the additional magnifying power in the lower part of the lens to help with near vision tasks.

Do I Need Add Power?
If you have presbyopia, your eye care professional will determine the appropriate Add Power during your eye exam.


Contact Lens Material

Why is Contact Lens Material Important?
Contact lens material affects comfort, oxygen permeability, and moisture retention. Common materials include hydrogel and silicone hydrogel. Your eye care professional can recommend the best material for your needs.

How Do I Choose the Right Material?
Your eye care professional will consider your eye health, lifestyle, and comfort preferences when recommending a contact lens material.


If you have any additional questions about these parameters or need further assistance, please reach out to our customer support team!