A guide to
Your prescription
After an eye exam, your optician gives you a prescription for you to use when ordering your unique opticals. Understanding this prescription helps you get the perfect lenses for clear vision. Here\'s a guide to help you decode it:
Sphere (SPH):
Negative (-): You are nearsighted, meaning you see things better up close.
Positive (+): You are farsighted, meaning you see things better far away.
Cylinder (CYL): If you have astigmatism, this number shows how much correction your lenses need to make your vision sharp and clear.
Axis: This number (from 1 to 180) tells you the direction to place the astigmatism correction in your lenses.
Pupillary Distance (PD): This is the distance between your pupils, measured in millimeters. It ensures your lenses are perfectly aligned with your eyes for the best vision.
Your prescription is unique to you. It\'s like a special recipe that helps create lenses just for your eyes, giving you the clearest vision possible. When you order opticals online at BERTA, these numbers help us make sure your lenses fit your needs perfectly.
If you have any questions or need help, our customer support team is always here for you. We want to make sure you have the best experience and the clearest vision with your new opticals!

Our lenses
The lenses significantly impact not just aesthetics but, more importantly, the quality of vision
Your Pupillary Distance (PD)
Why we need your Pupillary Distance (PD)
Your Pupillary Distance (PD) is crucial for making your opticals perfect. It is the measurement between your pupils and helps us align the lenses correctly with your eyes. Without your unique PD, we can’t ensure your lenses will give you the best vision. Knowing your PD means we can craft lenses that fit you perfectly and provide the clearest, most comfortable vision possible.
How to Measure Your PD at home:
If you don\'t have your PD, don\'t worry, measuring your PD at home is easy with these simple steps:
What You’ll Need:
- A millimeter ruler
- A mirror
- A friend (optional but helpful)

Your Pupillary Distance (PD)
Steps to Measure Your PD:
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Stand in front of a mirror:
Hold the ruler:
Align the zero:
Measure the distance:
Repeat to confirm
Knowing your PD helps us create lenses that are perfectly tailored to your eyes, giving you the best vision experience. If you have any questions or need further assistance, our customer support team is here to help!