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What Markings Must Be On Lenses and What is Spectacle Frame Markings

What is +0.00 in reading glasses?

Generally, if your glasses prescription indicates that there is no need for focusing power, you will have good vision. On the other hand, the further you go from zero (whether that number is positive or negative), the worse your vision becomes and the more you need to have your eyesight corrected. Therefore, +1.00 and -1.00 are quite modest; your eyesight is not too bad; you only require 1 diopter of correction. However, if your prescription is +4.50 or -4.50, you will require more clearness. A stronger prescription will be needed, at 4.5 diopters of correction.

What markings must be on the lenses and frames of your safety glasses?

Lenses Marking

There must be a manufacturer or supplier certification mark on all safety lenses, frames (front and temple), removable side shields, and other parts of the glasses, goggles, or helmet which are deemed suitable for use in hazardous conditions.

In the same way that plano safety frames must be stamped with the manufacturer’s logo or mark, prescription safety glasses must also be stamped with the standards that they comply with – such as “Z87-2” for prescription safety glasses or “Z87-2+” for safety glasses that meet impact standards.

What does spectacle frame markings mean?

Frame Markings

The lens width, the bridge width, and the temple length are all measured on the inside of one arm of glasses frames, and these numbers stand for the lens width, bridge width, and temple length. The lens width and the bridge width are often distinguished by a small square shape that is placed on the inside of the arm and may be separated by spaces or dashes.

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Do Progressive Lenses Have Markings on Them? How To Check It

Do progressive lenses have markings on them?

Most of the time, yes. The markings are necessary for the optician or laboratory to be able to identify the major fitting reference points on the lenses so that they can be properly placed in the frame. It is also possible to determine fit issues after the glasses have been dispersed if the wearer experiences a visual problem.

Although it is possible to have lenses made without markings, no major manufacturer offers lenses without the markings. They are ergonomically designed so that they do not interfere with vision and are not visible to the observer. They require magnification of at least 2X in a laboratory setting to be located. It is possible, however, that some high myopes can see them without glasses even when not wearing them.

Typically, progressive lenses have the following markings. They are commonly marked with waterproof ink when they are sent from the laboratory, which speeds up the fabrication process. Upon dispensing the lens, the ink is removed, however the microengraved markings underneath are permanent. These markings indicate that it is for the right side, the reading addition is +2.00, and the lens manufacturer is Essilor.

progressive markings

Do varifocal lenses have numbers on them?

It is true that these numbers indicate and describe the size of your eyeglass frames, specifically: 1) the eye size number (which represents the diameter of the lenses on your frame); 2) the bridge size number (which indicates the distance between the lenses on your frame).

How do you check lens markings?

lens markings

You’ll find up to three numbers on glasses frames, and they stand for the lens width, bridge width, and temple length. These numbers are written on the inside of one arm and may be separated by spaces or dashes. Often, a small square shape separates the lens width from the bridge width.

You may see other letters or numbers on the arm, and these could refer to the frame model, color, brand, or manufacturer. Usually, the glasses measurements are easy to spot, as they follow the same order and have standard ranges, all expressed in millimeters. Here’s how to read them.

Lens Width

As the first measurement of glasses, lens width, often referred to as eye size, is always the first in the series. In millimeters, it tells you how wide each lens is. This measurement only refers to the clear lens you are looking through, meaning it does not include any of the surrounding frames.

40-60 mm is a typical range

Bridge Width

In your frames, the bridge width indicates the shortest distance between the lenses. (Contrary to what you might expect, this is not simply a measurement of the bridge on your glasses.) A narrower bridge width accommodates a narrower nose, whereas a wider bridge width is best suited to a wider nose.

14-24 mm is a typical range

Temple Length

Approximately the length of each temple (or arm) of your glasses begins at the screw that attaches to the frame’s main body and continues to the tip that sits behind the ear. A common standard for this measurement is 135, 140, 145, and 150, which usually ends with a zero or five.

A properly fitted temple length will ensure that your frame extends far enough behind your ear without protruding too far.

120-150 mm is a typical range

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How To Remove Markings from Progressive Lenses and What Are The Levels of Progressive Lenses

Can you remove markings from progressive lenses?


Markaway is a leading product that removes permanent markers, dissolves inks, body oils, grease, glue and sticky labels. Markaway safely removes lens ink markings from all lens materials, including polycarbonate and high index, including polycarbonate and high index. Neither Acetone nor any other solvent that damages frames or lenses is contained in Markaway. Dissolves and removes progressive ink markings instantly, and because it does not contain acetone, it is safer to use than other lens ink removers that contain caustic acetone that can ruin polycarbonate lenses.


  • Free of acetone

  • The product is safe for use on polycarbonate lenses, high index lenses, including edges, as well as AR coated lenses.

  • This product does not contain any solvents that may damage frames or lenses.

  • In seconds, the lens marker paint and permanent marker markings can be removed.

  • Removes markings on progressive lenses that are difficult to remove.

  • The product dissolves inks, body oils, grease, glue, and sticky labels.

  • Enhances the efficiency and safety of laboratories

  • Reducing the need for lens remakes

  • Micro scratches are eliminated without scrubbing

  • The product dries instantly without leaving an oily residue

It is also possible to remove graffiti with Markaway!

Neither the eyeglass frame nor the lens will be damaged by Markaway’s solution.

N and D in multifocal lenses

What does the N and D mean in multifocal lenses?

A “D” lens is applied to the dominant eye, while an “N” lens is applied to the non-dominant eye.

What are the three levels of progressive lenses?

There are three prescription strengths in progressive lenses, or no-line bifocals, that are blended at each transition point in order to make it easy to switch between them. Unlike traditional bifocals or trifocals that have two or three strengths, respectively, that abruptly change in each lens, this lens does not have any lines.

Standard progressive lenses

In addition to being affordable and suitable for most people, standard progressive lenses will fit a vast range of budgets.

Depending on the brand name, the price of these lenses ranges between $175 and $250 for the base lenses, which is more expensive than the standard flat-top bifocal or trifocal lenses.

Short corridor progressive lenses

It is possible to use short corridor progressive lenses with smaller frames, providing both a fashionable and functional option for eyewear.

In view of their size, the fitting of these glasses requires the expertise of an optician.

A pair of progressive lenses is slightly more expensive than a standard progressive lens, ranging from $250 to $400.

Computer progressive lenses

The computer progressive lens is also referred to as an office lens or near variable focus lens. It is designed for short range use and provides clear vision between around 16 inches and 6 feet in height.

These lenses are perfect for those who spend more than four hours at their computers each day. They help reduce visual fatigue and computer vision syndrome.

The cost of computer progressive lenses generally ranges from $150 to $250. They are great for people who work at near and intermediate distances, as well as for allowing for better posture.

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What Are The Markings on Glasses Lenses?

What are the markings on glasses lenses?

You may have been wearing eyeglasses for quite some time now and are finding it difficult to choose the right frame? You are in the right place to receive all the acknowledgement you need to choose the perfect frame. You may have been wearing glasses for a long time, but have you ever noticed, observed, or examined your eyeglass frames? If you have, you may have noticed tiny numbers printed on the inside of those frames.

Marking on lens

You will notice distinct numbers stamped on the inside of your eyeglasses if you take a close look at them. These numbers indicate the structural meaning of your frames and are measured precisely. For the sake of preserving the frame’s design, these numbers are always printed on the inner surface of the temple or bridge. Consider if you were to stamp your favorite eyeglass frame with numbers on the outer surface. Obviously, you would not be satisfied with it, as it would completely destroy its charismatic and captivating design. As a result, these numbers are always printed on the inner surface of the eyeglass frames.

It is possible to see three numbers separated by a dash on the inside of your frame, for example 53-16-140, when you look at your frame. The optician will use these numbers to choose the most appropriate frame for your head size and facial characteristics. All of these numbers are expressed as millimeters (mm). A skilled optician will fit these variations in frame numbers in such a way that they are properly fitted, comfortable, and appear attractive. This number represents the eye size. Let us look at each number in order to get a better understanding of their meaning. The first number is 53, which represents the eye size. It is the horizontal width of the lenses. The number of eye sizes varies from 40 millimeters to 62 millimeters in most spectacle frames. Your eyeglass frame will have a first number between 40 and 62 millimeters.

A second number is also a two-digit number that is 16, which represents the bridge size. On spectacle frames, the bridge is usually between the lenses and it is also the bridge that rests upon your nose. Generally, the bridge size on spectacle frames varies from 14 mm to 24 mm. Lastly, there is a three-digit number 140 that represents the temple length, or the length of the stems of the frame that rest on your ears. You can measure it from the hinge of the frame to the tip of the temple. A typical temple length varies from 120 to 150 millimeters. The bridge and temple assist in fitting the frame comfortably to the face. It is not necessary to worry if these numbers do not appear inside the eyeglass frame. You can always measure your eyeglass frame with a millimeter ruler. If the tiny numbers are worn out or too small, you may have to use a magnifying glass to read them. As you already know which parts of the frame indicate which key measurements, you could easily measure it yourself with a millimeter ruler since you already know which measurements are indicated on the frame. For instance, the eye size can be measured horizontally at the widest points from one side of the lens to the other, just as the bridge size is the distance between the lenses, and the temple size is the sticks that rest upon your ears, and it can be measured from the tip to the hinge, which includes the bend.

It is not only possible to see these three numbers on the eyeglass frame, but also to see other printed material on the frame, such as a name, capital letters, frame model numbers, or frame colors. You can easily determine the color and the model number of your frame by looking at the frame model number and the color of your frame most of the time. Everyone wants to choose the best frames to look beautiful, so we choose the best frame with the most appealing colored frames in an ideal shape to complement our appearance. As the design structure can easily change these numbers, even if you choose identical glasses, the three numbers might still differ if you choose identical glasses. In order to select an eyeglass frame size that suits your facial features, it is wise to consult with a trained optician. Opticians have the capabilities to adjust the correct size glasses for you. Although they are not eye doctors, they utilize the prescription for fitting and selling eyeglasses and other eyewear. Since some opticians have been trained in opticianry and may also have a license, nearly all spectacle frames are constructed so that they can be adjusted by opticians. In cases of loose glasses, for example, which are slippery or come off your nose, or which do not fit perfectly on your ears, an optician can fix these for you without any hassle. After learning more about how to select the best eyeglass frames that reflect your facial appearance, you will be able to choose your glasses without any difficulty.

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What Are Varifocal Markings and How Do You Identify It

Varifocal Markings

What are the markings on varifocal lenses?

Occasionally, progressive glasses may have marks on them, and some people believe that these marks are defects in the lenses. The marks may appear as circles, letters, or numbers.

What are these marks? Is it embarrassing to wear glasses with marks on them? No. These marks are the marks left behind during processing of the lenses. To align exactly where the point in the lens where your distance prescription changes into a reading prescription is engraved or etched, this is a standard industrial practice. The engravings are etched into the front surface of the lens at approximately 0.05 mm depth. As a comparison, human hair typically measures between 0.06 and 0.08 millimeters in thickness.

In each lens, you will find two of these circles (or other identifying marks depending on the manufacturer of the lens, but they are always the same in each lens). The 175 represents the reading power or the ADD according to your prescription.

These marks always appear in the blending regions of the lens, which contain non-prescribed power and provide only minimal visual utility. Consequently, these marks will not affect your vision. It will not matter whether you are able to see directly through the marks while wearing them, since the power you are looking through will not be.

progressive markings

How do you identify progressive markings?

A majority of modern lenses are marked with laser engravings (older lenses may have fluorescent markings). Look for the engraved symbols and refer to the Index at the front of the book to identify them.

If you examine the front of the lenses very closely with an incandescent light and a 7x magnifier, you may be able to see marks if they are present. On older lenses, the nasal mark may appear even if the temple or outer marks do not. Concentrate on those first.