![]() This number represents your PD in millimetres. Read the millimetre line that lines up with the centre of the light reflection in your right pupil. Without moving your head or the ruler, open your right eye,close your left eye and move the light below your right eye.Close your right eye and align the ruler from zero to the centre of the light reflection in the left pupil. ![]() Place your phone below your left eye, shining the light towards the mirror. Hold the ruler directly above your eyes and place it against your brows, making sure you keep your face front on to the mirror.At a distance of about 20cm away, look front on into the mirror.You will need a ruler, a mirror and torch (your phone will suffice).You can measure your own PD using a millimetre ruler and a mirror. Measuring your PD at home really comes in handy when you want to order prescription glasses online and already have your prescription but don’t know your PD. How to read an eyeglasses prescription.How to measure your pupillary distance at home A new technique to determine vertical dimension of occlusion from anthropometric measurement of interpupillary distance. Interpupillary distance measurements among students in the Kumasi Metropolis. The effects of age, refractive status, and luminance on pupil size. You can learn more about how we ensure our content is accurate and current by reading our editorial policy. We link primary sources - including studies, scientific references, and statistics - within each article and also list them in the resources section at the bottom of our articles. Medical News Today has strict sourcing guidelines and draws only from peer-reviewed studies, academic research institutions, and medical journals and associations. Its glasses also come with a 365-day product guarantee that allows customers to claim a one-time replacement pair if the glasses are defective. ![]() EyeBuyDirect offers a 14-day fit and style guarantee with a one-time replacement or refund.
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