Loupes Measurements Explained
These are IPD, WD, and VPP. VPP photos are only for Prism Loupes.
If you're looking for instructions on how to obtain these measurements, head over to our Measurements Guide page.
What is IPD?IPD stands for inter-pupillary distance. Interpupillary distance is the distance measured in millimeters between the centers of the pupils of the eyes. This measurement is different from person to person and also depends on whether they are looking at near objects or far away.
Why do we need an IPD photo from you?Your IPD is very important to our custom Loupes production process. Without it, we cannot effectively create your custom-made loupes. All TTL Loupes require an IPD photo. Flip-up Loupes sometimes do not require an IPD photo as the telescopes on flip-up Loupes can be adjusted. If you wish to have a prescription filled on your flip-up Loupes then you will need to submit an IPD photo with your order. Without knowing your IPD, we cannot effectively custom build your Loupes!
What is working distance?Working distance is the distance between your eyes and the working area. This distance varies from person to person depending on your height, working style and other factors.
Why do we need your working distance?Working distance is crucial to having good ergonomics and functionality with your Loupes. If the working distance on your Loupes is too far or too near then you will likely experience discomfort or difficulty effectively working. There are also several issues with vision that can occur with your Loupes if they are not designed at the proper working distance, so it is very important to know this information.
What is VPP?VPP stands for vertical-pupillary-position. It is a measurement of where your line of sight will intersect with the frame of your loupes while in use. It should be noted that VPP photos are only needed for the production of our Prism Loupes.
Why do we need VPP photos?Loupes with Prism telescopes provide several benefits when compared to those with traditional Galilean telescopes. Prism Loupes have an expanded field of view and superior image clarity if they are designed and worn properly. Galilean telescopes may have inferior performance but they are more forgiving in terms of where they can be worn on the face and still function effectively. Prism Loupes are more intricate, however, and your line of sight needs to be directly through the center of the telescopes in order to take advantage of the benefits they can provide.
VPP photos are taken using our ErgoFit Kit. When you place an order online for Prism Loupes, you will be sent our ErgoFit Kit with your frame of choice and a prepaid return label. After taking and submitting your VPP photos, you will send your frame and ErgoFit back to us and we will custom make your Prism Loupes.