How to Measure Your Pupillary Distance (PD) for Online Glasses
When ordering glasses online, knowing your pupillary distance (PD) is crucial. PD is the distance between the centers of your pupils and ensures that the lenses are correctly aligned with your eyes for optimal vision. Here’s a simple guide to measuring your PD at home.
Your Optometrist or Opticians will measure the PD when you are having your new prescription made up into your glasses. First, they would gather their tools: a special millimeter ruler, a fine tip marker and a mirror. They would sit or stand about 12- inches from you. They would ask you to look straight ahead and hold the ruler against your brow.
They would then ask you to close your right eye and align the zero mark of the ruler with the center of your left pupil. Then, without moving the ruler, close your left eye and open your right eye. Note the measurement to the center of your right pupil. This number is your PD. For most adults, PD ranges between 54-74 mm.
You could do this by placing a mirror in front of you at the same distance and following the same steps as mentioned above.
If you have someone to help, the process can be even easier. Have them stand in front of you and measure the distance between your pupils directly. Ensure you both are looking straight ahead and at the same level.
Some online applications offer digital tools to measure PD. These tools typically involve uploading a photo of yourself holding a card with a known measurement (like a credit card) next to your forehead. The software calculates your PD based on the reference size.
Ensuring an accurate PD measurement is critical. Incorrect PD can lead to eye strain, headaches, and even distorted vision because the optical centers of the lenses won’t align correctly with your pupils.
By taking a few minutes to measure your PD accurately, you can ensure your online glasses will be comfortable and provide the best possible vision correction.
Disclaimer.
The best results are achieved by having an accurately measured PD, by a qualified person. We accept no liability for PD measurements that are inputted into our platform. If possible, you can attend our store for these measurements at a cost (£25 – other, additional charges such as measurements for bifocals and varifocals or consultation advice. These are by appointment only and payment is made on booking).
Can You Use a Contact Lens Prescription to Order Glasses Online?
A common question among those new to buying glasses online is whether they can use their contact lens prescription to order glasses. The short answer is no; you need a specific prescription for glasses. Here’s why.
Contact lens prescriptions and glasses prescriptions differ in several ways. Contact lens prescriptions include measurements for the curvature and diameter of the lenses, which aren’t needed for glasses. They also typically have different sphere (SPH) values because contact lenses sit directly on your eyes, while glasses sit a bit away from your face.
For glasses, you need a prescription that includes sphere (SPH), cylinder (CYL), axis, and possibly an ADD (for multifocal (bifocals and varifocals) lenses). Additionally, you’ll need your pupillary distance (PD), which is not part of a contact lens prescription. This measurement ensures the lenses align correctly with your eyes.
If you only have a contact lens prescription, you’ll need to visit your Optometrist to get a proper glasses prescription. Many eye care providers will provide both prescriptions during a single exam, so be sure to ask for both, next time you have your eyes checked. The eye examination for glasses and the contact lenses assessment and aftercare are all different types of examinations.
Having the correct prescription is essential for optimal vision and comfort. Using an incorrect prescription can lead to headaches, eye strain, and blurred vision. Therefore, always use the specific prescription for glasses when ordering online.
By understanding the differences and ensuring you have the correct prescription, you can successfully order glasses online and enjoy clear, comfortable vision.
How to Determine Your Correct Prescription for Glasses Online
Buying glasses online can be convenient and cost-effective, but knowing your correct prescription is crucial. Here’s a step-by-step guide to ensure you have the right prescription for ordering glasses online.
First, ensure your prescription is up to date. Eye prescriptions typically expire within one to two years, so it’s important to have a recent eye exam. During the exam, your optometrist will measure various aspects of your vision and provide you with a prescription that includes your sphere (SPH), cylinder (CYL), axis, and possibly your ADD (for bifocals or progressives).
Next, you’ll need to measure your pupillary distance (PD), the distance between the centers of your pupils. This measurement is crucial for aligning the lenses correctly with your eyes. You can measure your PD at home using a ruler and a mirror, or virtual tools to help with this process.
When entering your prescription online, be precise. Double-check that all numbers and details are correctly entered. At Smart Eyecare you also have the option to upload your prescription to ensure accuracy. You can also visit us in-store.
If you wear multifocal lenses, such as bifocals or progressives, we will need to carryout extra checks to produce them. Accuracy is even more critical with these complex lenses.
Lastly, consider consulting with customer service if you’re unsure about any part of your prescription or the ordering process. Smart Eyecare was founded by a qualified Optometrist. Our Optometrist team are available to help with questions and ensure your order is accurate.
By following these steps, you can confidently order your prescription glasses online, saving time and money while ensuring you get the correct lenses for your vision needs.