Single PD vs Dual PD A Detailed Comparison | Vision Boutique (2024)

FAQs

Single PD vs Dual PD A Detailed Comparison | Vision Boutique? ›

If it is included, it can be one or two numbers. A single PD number (also called binocular PD) is the total distance between the middle of both your pupils added together. A dual or two PD numbers (called monocular PD) is the measurement of the center of each pupil to the bridge of your nose individually.

Single PD vs.

Some individuals may have a slightly different PD for each eye, and a dual PD can provide a more customized fit. Single PD: Typically used for standard single-vision lenses. Dual PD: Recommended for progressive or bifocal lenses for enhanced precision.

What is the difference between 'single' and 'dual' pupillary distance? A 'single' pupillary distance number is the distance in millimeters between one eye's pupil to the other eye's pupil. A 'dual' pupillary distance number is the distance in millimeters from each eye's pupil to the center of your nose.

DUAL PD, or monocular PD, consists of two numbers and is the distance between the centers of each pupil to the bridge of the nose. Dual PD is usually written in the following notation: 32/30. The first number is always the right eye (OD) measurement, and the second number is the left eye (OS).

The combined measure of monocular pupillary distance of both eyes should give you your total binocular pupillary distance, or "single PD." The monocular PD is taken when you need progressive lenses.

Pupillary Distance (PD) And The Importance Of Having An Accurate Measurement. Did you know that an error of only 2mm can lead to a loss of more than 40% of your clear vision field? PD, or pupillary distance, refers to the distance in millimeters between the center of one pupil to the center of the other.

What Happens If Your Pupillary Distance Is Off? Pupillary distance makes your glasses prescription comfortable and clear. If you have the wrong measurement, it might cause blurriness, headaches, or eye strain. Mistakes can happen whether you measure it manually or your optician does it with a PD meter.

Does pupillary distance have to be exact? The pupillary distance measurement does not have to be 100% precise to be applicable, as it can tolerate a small error range. A PD difference of 1mm is not going to cause too much discomfort, and would not be noticeable.

The average PD measurements for women is 62mm and for men 64mm. Between 58 and 68 is quite normal though.

If you're wearing glasses made using an incorrect PD measurement, you'll probably notice symptoms related to the misalignment. Those include eyestrain, headaches and distortions in your vision. These symptoms aren't dangerous, but they also aren't pleasant.

Can wrong PD cause double vision? ›

Humans have binocular vision, meaning our eyes work together to perceive depth and 3D space. An incorrect PD measurement can lead to visual discomfort, double vision, and issues with depth perception.

Where is my PD on my prescription? PD may or may not be included on your prescription. It's often measured separately by your eye care provider and can be provided upon request (sometimes with an additional fee).

Your eyeglass lenses have an “optical center,” which is the ideal spot for your pupil to look through in order to have optimal vision. Having an accurate PD measurement is the key to getting your lenses to line up with your pupils and provide the best possible results from your eyewear.

Dual 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.

The ideal lens height is between 28 – 34mm. So, if the frame style is too wide, too narrow, or an irregular shape, you will be uncomfortable trying to look through the correct part of the lens. Ignoring the technicalities, frame style can also be influenced by your face shape.

Individuals with strong prescriptions, a high degree of astigmatism, or specific visual needs may not find progressive lenses suitable.

Your optician or eye doctor can measure your PD at your eye exam with an instrument called a pupillometer. Sometimes your PD is included on your prescription, but not always. A PD measurement from a pupillometer will always be the most accurate.

Your prescription lenses are designed to correct refractive errors such as nearsightedness, farsightedness, and astigmatism. An accurate PD measurement ensures the corrective power is placed where it's needed, maximizing the effectiveness of your eyeglasses.

Most adults have a PD between 53 and 70, and children will be between 41-55. You might be given two numbers such as 63/60. This would mean that you use 63 as your PD for distance vision. The smaller number would be used only when converting the prescription to single vision reading glasses and multifocal lenses.

Average pupillary distance for an adult is between 54-68mm, with acceptable measurement deviations generally falling in between 48mm and 73mm. The range for children is approximately 41-55mm.