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How to Measure Your Pupillary Distance
What is Horizontal Pupillary Distance (HPD)?
Horizontal Pupillary Distance (HPD) is the measurement in millimeters between the centers of your pupils, crucial for accurately aligning eyeglass lenses with your eyes to ensure optimal visual clarity and comfort. It’s essential to get an accurate HPD measurement as it affects how the light entering the lenses aligns with your pupils. If the lenses are not centered properly over your pupils, it can lead to issues like eye strain, visual distortion, and discomfort.
How to measure Horizontal Pupillary Distance (HPD) for your ONA RX eyewear
To determine your Horizontal Pupillary Distance (HPD), you have a couple of options:
- Contact your eye care provider: If you’ve received prescription glasses from an optician before, reaching out to them directly is a good choice for assistance. This measurement must be taken wearing your ONA frame with the blank lens provided.
- Measure at home with assistance: Put on your Ona frame with the temporary lens provided. Face the person helping you and look straight ahead with both eyes open.
Have your helper use a black marker to mark the center of each pupil directly on the temporary lens. Remove the frame and use a small ruler (with millimeter markings) to measure the distance between the two marks. This is your HPD.
What is Vertical Pupillary Distance (VPD)?
Vertical Pupillary Distance (VPD) is the measurement of the distance between the center of your pupil and the bottom edge of an eyeglass. It ensures proper alignment for clear vision and comfort, especially in multifocal lenses. Accurate VPD measurements are crucial for optimal eyewear fitting and visual performance.
How to measure Vertical Pupillary Distance (VPD) for your ONA RX eyewear
For Ona RX lenses, the Vertical Pupillary Distance (VPD) refers to the measurement from the center of the pupil to the bottom edge of the lens (NOT the frame). This measurement ensures precise alignment for clear vision and optimal visual performance.
To determine your Vertical Pupillary Distance (VPD), you have a couple of options:
- Contact your eye care provider: If you’ve received prescription glasses from an optician before, reaching out to them directly is a good choice for assistance. This measurement must be taken wearing your ONA frame with the blank lens provided.
- Measure at home with assistance: Put on your Ona frame with the temporary lens provided. Face the person helping you and look straight ahead with both eyes open.
Have your helper use a black marker to mark the center of each pupil directly on the temporary lens. Remove the frame and use a small ruler (with millimeter markings) to measure the distance from the bottom edge of the lens to the marked dot on each pupil.
Remember, for precise measurements, consulting a professional is recommended.