![]() It will show how the lens will refract the light, a correction number for astigmatism, and the diopters, which are the measurement units for the optical power of your lens. Each eye will have a number indicating how weak it is separately. However, an eye test is important to find the prescription for your left and right eyes. If there are any medical issues with your eyes that eyeglasses cannot solve, they will refer you to an ophthalmologist. They have the equipment to photograph the back of your eyes, test for eye pressure, and see if you have any defects such as cataracts. Most optometrists have the necessary tools and equipment to do your eye test for you as accurately as possible. It is also important to be able to read your own prescription. This will also be helpful when you need prescription sunglasses. The numbers are necessary to provide you with the correct prescription eyeglasses. It is especially the numbers indicated on it that are important. There are a number of elements that are necessary for your prescription. Only progressive prescriptions require segment height. Learn more about segment height and how to measure it here.Having your eyes tested is the first step to getting a prescription. PD is the horizontal distance between your pupils, while segment height is the vertical distance between the bottom of your lens to the center of your pupil for progressive lenses. What's the difference between PD and segment height? To find your PD for reading glasses, subtract 3 mm from your single PD or 1.5 mm from your right and left dual PD measurements.įor example, if your single PD for regular glasses is 63, it is 60 for reading glasses, and if your dual PD measurements are 33 and 30 for regular glasses, they are 31.5 and 28.5 for reading glasses. Yes, PD is widest when looking into the distance and narrowest when looking at closer objects, like reading a book. ![]() Single PD is the total horizontal distance between the centres of your pupils, whereas dual PD refers to the individual measurements between your nose bridge to the center of each eye.įor example, your right PD is the distance between the centre of your nose bridge to the centre of your right pupil, and your left PD is the distance between the centre of your nose bridge to the centre of your left pupil.ĭual PD measurements offer greater accuracy because most of us don't have symmetrical faces where your left and right pupils are equidistant from your nose. Sometimes, your prescription may indicate a single PD or a dual PD. The average PD for adult males is slightly larger at 64 mm, which is about 2.52 inches What is the average pupillary distance (PD) for male? The average PD for adult females is 62 mm, which is about 2.44 inches. What is the average pupillary distance (PD) for females? Repeat the process three times to ensure a consistent measurement. Look straight, close your left eye and open your right eye.ĥ. The difference between the measurement values aligned with your left and right pupils is your PD.Ħ. Close your right eye and align the ruler’s mm-line over the centre of your left pupil.Ĥ. Stand about eight inches (20 cm) away from a mirror.ģ. You can measure your PD at home with a ruler and mirror.ġ. How do you measure pupillary distance at home? Here are two apps you can use to measure your PD with your mobile device: Your optometrist should be able to share your PD with you, but you can also measure it yourself with a ruler and a mirror or use a PD measurement mobile app.Īre there apps to measure pupillary distance (PD)? This measurement enables the optical lab to align the focus of the lenses with the pupils of your eyes, ensuring maximum clarity. Your pupillary distance (PD) refers to the horizontal distance between the centers of your pupils. What is your pupillary distance and why does it matter?
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