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What Do Numbers On Glasses Mean

Measure The Glasses And Sunglasses Size With A Ruler

What Do the Numbers on Glasses Mean? | SportRx

If you cant find any numbers or specifications on your old sunglasses or glasses, dont worry. That just means its time to test your measuring skills.

Take a ruler or a tape measure and carefully measure the size of the glasses, following the graphic below.

Since too many numbers can get a little confusing, the glasses and sunglasses in Lentiamos online shop are labelled S , M or L , according to the lens width.

Once you have the correct measurements, head over to our sunglasses section and find your favourite pair.

A Glossary Of Eye Prescription Abbreviations

  • ADD stands for the additional lens power needed to make it easier for you to read. This number is seen on prescriptions for reading glasses or the lower portion of bifocal or progressive lenses.
  • Axis is a number between 1 and 180. It indicates exactly where the astigmatism appears on your eye.
  • BO, BI, BU, BD stand for base out, base in, base up, and base down. These abbreviations tell the eyeglass manufacturer exactly where to position the prism on eyeglasses that correct double vision.
  • CYL stands for cylinder, or the amount of astigmatism in your eye. The cylinder and axis together help correct astigmatism.
  • DV is an abbreviation for distance vision. This number indicates whether you have nearsightedness or farsightedness.
  • NV stands for near vision, or the amount of power that needs to be added to make reading easier.
  • OD means oculus dexter, or your right eye.
  • OU stands for oculus uterque, or both eyes.
  • OS is oculus sinister, or your left eye.
  • PD means pupillary distance. Monocular PD is the distance from your pupil to the middle of your nose. Binocular PD is the distance from one of your pupils to the other pupil.
  • Prism is used if you have double vision. It indicates the amount of prismatic power your glasses need to correct for differences in the alignment of your eyes.
  • SPH means sphere, or the power of the lens that will correct your eyesight.

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Size Numbers For The Frame And The Lenses

When it comes to the size of the frame and lenses, it is usually represented in the following way 5218. The first number represents the width of the lens in millimeters while the second number represents the distance between the two lenses.

This is true for all glasses have two separate lenses at Rayban. However, if the sunglasses consist of only one lens, then you will find in the temple also only one number. For example, 135. This is again a millimeter, but this now describes the total width of the shield from the right side of the lens to the left.

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Features Of Progressive Lenses

With the proper head position, the wearer can have a clear and continuous vision at all distances from the distal point to myopia through the progressive lens. When the eye moves from one area of vision to another, the eye adjustment process is natural and smooth, without any visual fluctuations. With natural vision and better adaptability, it is in line with physiological optics. The mid and near vision area is relatively small: Some wearers may feel that the gradient area of the progressive lens is smaller, which limits the width of the saccadic eye and requires increased head movement in order to achieve the same reading range. At medium and short distances, the wearer needs to coordinate certain head movements.

Exceptions To The Rule

What do the measurements on glasses and sunglasses mean?  Touch of Modern

While these numbers are usually the most prominent markings found on the interior of the frames of your glasses, there is a chance you will see other numbers listed. In most cases, these are manufacturer markings to denote specific features of the model. You might see numbers meant to highlight the design of the frames or the type of lens colors used. These numbers will usually be easy to differentiate from the dimensions of the glasses because the codes will usually be larger numbers than the measurements.

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Is 20/40 Vision Bad

Although 20/40 vision is less acute than average, that doesnt mean you should think of it as bad. Someone with 20/40 vision just wouldnt be able to see clearly at quite as far of a distance as someone with normal vision.

We keep putting normal in quotes because normal is pretty subjective, dont you think? 20/20 vision is referred to as average or normal because its a reliable benchmark for visual acuity, but it doesnt mean that most people actually have 20/20 vision.

Use A Credit Card To Find Your Frame Width

Most credit cards are the same size, with the shorter edge measuring 54 mm. Place the card on the middle of your nose, with the short end just under your eye.

If the card:

  • Extends past the corner of your eye, narrower frames are right for you.
  • Ends near the corner of your eye, medium frames are your best choice.
  • Ends before the corner of your eye, wide frames are the option for you.

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What Are The 3 Types Of Lenses

What are the 3 types of lenses?

  • Concave lens: The centre of the concave lens is thinner than the edges.
  • Convex lens: The centre of the convex lens is thicker than the edges.
  • Plano lens: One side of the Plano lens is flat and the other side is either concave or convex.

What To Know About Farsighted Prescriptions

Ray-Ban Guide: What Do The Numbers Mean?

Farsightedness, or hyperopia, is a refractive disorder that makes close objects harder to see than distant objects. It happens because the distance from the cornea to the retina is too short or because the cornea of your eye is not curved enough.

If youre farsighted, light focuses behind your retina instead of squarely on it.

For a farsighted prescription, the strength of the lenses will be marked with a plus sign. The more farsighted you are, the higher the numbers will be. For instance, a lens prescription of +4.50 is a stronger prescription than one thats +2.00.

Correcting your vision with glasses or contact lenses, for both nearsightedness and farsightedness, may also help prevent:

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Should Glasses Be Tight Behind Ears

The reason your frames might hurt behind your ears is that the frame size is simply too small for the size of your head. If you feel a niggling pain or uncomfortable pressure where the temple tips meet the area behind your ears, chances are your frames are just too tight.

Glasses Measurements: How To Find Your Frame Size

If you have them, take a look along the inside of your eyeglasses. Youll likely find a series of numbers. These are the measurements of your glasses frames. Along with your eye prescription, glasses measurements are essential to helping you see clearly and comfortably.

In this guide, we cover everything you need to know about glasses measurements and finding the right frame size.

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The Meaning Behind 20/40 Vision

20/40 is a measurement of your visual acuity , which is determined during the refraction portion of an eye exam.

During a refraction test, you read letters off a Snellen chartit has rows of letters decreasing in size with the smallest letters at the bottom of the chart. You do this without any vision correction . The eye doctor has you read the row with the smallest letters you can see clearly while seated 20 feet away. Sound familiar?

The numbers in your visual acuity measurement have to do with distance. It might be easiest to explain if you imagine the Snellen chart: When you have a Snellen test score of 20/40, that means youd see the chart as clearly at 20 feet away as someone with normal vision would see it from 40 feet away.

In other words, the top number is the distance you are from the chartthe 20 represents 20 feet .

The eye doctor determines the smallest set of letters you can read clearly, and the bottom number of your score represents the distance at which someone with normal vision would be able to clearly read the letters in that row.

Is Your Pd Written On Your Glasses

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Your pupillary distance is a facial measurement unique to you, therefore will never be printed on your glasses. Your PD or dual PD is the total or combined distance between your pupils and is not determined by the size of a spectacle or sunglasses frame. The same goes for your ocular heights which the vertical component of your lens centration.

For instructions on how to measure your PD,

For instructions on how to measure your OC heights,

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How To Read Eyeglasses Size

This article was co-authored by Alexander Knezevic, MD. Dr. Alexander Knezevic is an Ophthalmologist at the Macy Eye Center in Los Angeles, California. He also is Medical Staff at Cedars-Sinai Medical Center and is a Clinical Instructor of Ophthalmology at UCLA. He graduated with his Doctor of Medicine degree from the University of Nebraska Medical Center, and he completed his Residency at the McGaw Medical Center of Northwestern University. Dr. Knezevic did his Fellowship at the University of California-Irvine, and hes board certified by the American Board of Ophthalmology. Additionally, Healthgrades has awarded him their Honor Roll award. This article has been viewed 89,933 times.

Knowing how to read your eyeglasses size will help you find the best fit, especially when shopping for glasses online. Your glasses size is made up of 3 numbers that indicate measurements in millimeters, such as 45 20-135. The first number will be the eye size, which measures the width of 1 lens. The second number indicates the bridge width, or the distance between the lenses. The third number, or the temple length, tells you how long the arms of the glasses are. To find the perfect fit, you can take your own measurements or have them taken by an optician. Use your measurements to find a comfortable and flattering pair of eyeglasses with the perfect fit!

Reading Frame Size And Dimensions

Before we review what these numbers mean, lets first understand how to read frame measurements. You read the numbers from left to the right in the following order:

  • 1st Number Is the lens width
  • 2nd Number Is the bridge width
  • 3rd Number Is the temple length

Finally, these measurements are expressed in millimeters . You can see this illustrated below with a pair of Oakley sunglasses.

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How Do You Measure Glasses At Home

Measure your glasses at home easily by following these simple steps.

Remember: You need to measure in millimeters.

  • Lens Width

    Measure horizontally at the widest point of the lens. Do not include the rim that holds your lens in place in the measurement.

  • Bridge Width

    Measure from the innermost top corner of each lens where the bridge of your eyeglasses is located. For this measurement, remember to measure from lens to lens and include the rim of your frame.

  • Temple Length

    Measure from the screw that holds the temple arm in place to the point where the arm curves behind your ear. Next, measure the distance from the curve to the temple arms tip. Add these two numbers together to find the temple length.

  • Lens Height

    Measure your lenses inside the rim of your frame. This is similar to Lens Width, only this time youre measuring vertically .

  • Frame Width

    This is the entire width of your glasses frames, including any hinges or decorative pieces that stick out.

  • Why Is This Important To Know

    What The Numbers On Your Glasses Prescription Mean (Close Up Look At Sphere Power)

    A common misconception among patients is that their eye size is fixed and that if the eye size of their current glasses is, say, 54 , then they need their new glasses to be a 54 as well, says Wolfe. This is not necessarily the case, since the AA and BB values interact with each other.

    Everyone comes in different shapes and sizes, and that includes the dimensions of your face. A pair of glasses that works well for one person may not fit comfortably for another. These simple facial measurements make finding a pair of snug glasses easier for the patient.

    For example, you may have a very rectangular frame with an eye size of 56, and a 16mm distance between lenses, explains Wolfe. If you wanted to switch to a rounder look, you may get a similar fit with a frame that has an eye size of 50, but an 18mm distance between the lenses. This is why its important to try frames on in person, rather than simply going by the eye size number of your current glasses.

    Especially when looking to purchase a new pair of glasses online, most people focus on the optical prescription. Dont get us wrong, the prescription is essential, but making sure the glasses sit correctly on your face is just as important. While you can use these sizes as a guide, every pair of glasses is different, so if youre looking for the best fit, definitely seek the guidance of a professional. Next, see if you can use FSA or HSA for glasses before you check out.

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    What Do The Numbers On Ray Bans Mean

    Here in this article you will learn what exactly the numbers in the temple of Ray Ban glasses and sunglasses mean. The numbers contain the following information:

    • The color of the frame
    • The size of the frame
    • The type of lenses

    With this information it will be easier for you to check what you have and what you may need to reorder if something is broken. Lets look at it directly with an example. At the bottom of the photo you can see a typical row of numbers in combination with letters, which you typically find on Ray Ban sunglasses.

    First you see the letters RB which tells it is a Ray Ban sunglasses model. Other models which are made for prescription lenses begin with the letters RX. Next comes a four digit number. In our example it is 2132 which stands for the very popular new wayfarer model. In this case you do not only have the model printed on the temple in numbers but also in letters which is not the case with every Ray Ban.

    Next follows the number 901 which stands for the color of the frame. In our example it is black. After that a L follows which stands for the color of the lenses. After the color code the size of the frame is described. Here 5218 is printed on the temple.

    The N behind it stands for the type of solar glass. So in our case we have glasses with normal tint without polarization.

    What Do The Numbers On Glasses Mean

    In this section, we will show you the glasses numbers meaning. These numbers on glasses frames are the measurements that indicate and describe the size of your eyeglasses frames, specifically:

  • The eye size number .
  • The bridge size number .
  • The temple length number .
  • The three numbers mentioned above are the key measurements that describe the glasses measurements of the frames in eyeglasses. For example, you will see three numbers like 51-17-145 at the temple of your glasses. These numbers help the optician to choose the best-fitted frame for your head size and facial features.

    All of these three numbers are measured in millimeters. These variations in frame numbers are fitted by a skilled optician so that it should be best fitted, be comfortable and look good on the appearance. Now, lets look at the meaning of numbers on glasses frames.

    The first number on glasses frames is the eye size. It is the horizontal width of the lenses. In general, the number of eye sizes varies from 40 mm to 62 mm in most of the spectacle frames.

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    The second number is the bridge size. It is the distance between the lenses. Also, it is the bridge that rests upon your nose. Mostly, the size of the bridge on glasses frames would be from 14 mm to 24 mm.

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    What Does 20/40 Vision Mean

    20/40 vision is a measurement of visual acuity, and while this vision test score may represent a less-than-perfect result, that doesnt mean you should consider it bad.

    Most people have heard of 20/20 vision, and some might know that 20/40 vision would be considered less sharp than thatbut far fewer people actually understand what these vision measurements truly mean. Its our hope that this guide will help you see this topic a little more clearly.

    What Do The Little Numbers On Your Glasses Mean

    Reading Your Eyeglass Prescription

    On a typical pair of glasses, youre going to find three measurement numbers, usually in the form of AA-BB-CCC , explains optometrist Jonathan Wolfe from Ardsley, NY. He explains that the numbers represented by AA correspond to the measurement of your eye size. This would be the width horizontally of the opening on one eye. This number typically ranges from 42-58mm. The larger the value, the larger the frame.

    The second number represented by BB measures the distance between the right and left lens, which usually ranges from 16-24mm.

    Lastly, the CCC value is the length of the arms, usually between 130-150mm. The larger your head, the greater that number is so your glasses can sit comfortably on your face. Find out more secrets your eye doctor wont tell you.

    rd.com, Getty Images

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