Monitor Glasses and Blue Block

Monitor Glasses and Blue Block


Blue Light is Causing Problems.

Our MojoBluBlock Lenses Can Solve Them.

What are "monitor glasses"? Monitor glasses are eyeglasses that protect the wearer's eyes from computer screen glare and blue light. Monitor glasses, or computer glasses, have certain features in the lenses that protect your eyes and reduce the symptoms of computer vision syndrome (CVS). Monitor glasses are typically offered with no reading powers. We offer them with or without reading powers or with prescription lenses. 

If you are one of the millions of people that use an iPad, tablet, or e-reader, you may be having some problems. Recent studies have been showing that intensive use of these devices, are causing headaches, eye strain, dizziness, and insomnia.

Why? Well it has to do with a specific part of the blue light spectrum that are emitted by these devices. There is a too common misconception that all blue light is bad and that is simply not true. It is not all blue light. In the visible light spectrum, blue light is a good thing (495-465nm). You would not want to filter out all blue light.

It is important here to note that Scientists, Researchers, and the Optical Industry all have varying views on the exact range of blue light in the electromagnetic spectrum. It can vary by + or - 10nm! For our products here at ReadingGlassesETC, we use the range of 405nm to 500nm. This is the range that our lens and lens tint manufacturers use as well as most of the eyeglass industry.

The blue light that is causing problems is part of the Near Ultra-Violet-A spectrum. Based on current research, the most harmful part of the near UV-A blue light spectrum is a 40nm band at 415nm-455nm. This range was determined from research done by the Paris Vision Institute in 2008. This 40nm band causes the most retinal damage though other studies show that between 430-440 to be particularly damaging.

We have known for a long time that UV-A and UV-B light to 400nm can be physically harmful. Now there is data that suggests that "Near UV-A" at between 415-455nm can cause problems running from headaches and insomnia to possibly damaging your eyes.

The high energy and severe scattering of this band of blue light is a cause of glare and flash. Blue light emitted by electronics such as computer monitors, televisions, smartphones, as well as LED light sources during the day or night will easily cause eye strain and fatigue.

There have been many scientific studies done on the effects of blue light from electronic devices on human eyes. See current resources at the bottom of this page. 

We Have Solutions:

"Traditional blue blockers give you pretty sunsets, but that's not what you want. You don't want color distortion; you want your colors to be natural. The traditional blue blockers do not discriminate in the blue light spectrum. They just block all the blue light." - Dr. Ronald Melton, OD from: The Lowdown on Blue Light: Good vs. Bad, and Its Connection to AMD The Review of Optometry.

The problem for consumers has been the reporting of these ranges as being damaging without explaining the variance in the designation of the blue light spectrum. A blue block tinted lens in a over saturated yellow color will block most, and maybe all blue light. That is not what you want in a good optical pair of glasses though. Too much good light is being filtered out. This is why we have begun using the Wertheim Factor as a way to rate the efficacy of tinted blue blocking lenses.

The Wertheim Factor looks at the light transmitted by a filter on the short wavelength side of the photopic curve (550nm). A. Einstein discovered that the energy carried by (and potentially the damage that could be caused by) a light photon increases as its wavelength decreases: E = hc/(wavelength). By filtering the higher energy light to progressively smaller and smaller values as you get to shorter and shorter wavelengths you should optimize color rendition while providing protection. The Wertheim factor is largest when this balance is attained.

Air or a black material would have a Wertheim factor of zero. A lens with a typical non-blue block light tint would run somewhere around WF-16. A blue block tinted lens will measure higher depending on the color and color depth or intensity. A great lens with a Wertheim factor of 35 to 42 would filter bad UV/Blue/HEV and transmit good light for optimal vision. A Wertheim factor of over 43 means that more UV/Blue/HEV light is being filtered than necessary (and with some colors beyond a safe range), resulting in overly saturated bright lenses that do not provide better vision and look awful cosmetically.

Over saturated lenses with blue filtering tints (a Wertheim factor of 43 to 50) are sometimes useful as therapy tints that are used to address certain health and vision issues like color blindness, autism, and others.

Mojo BluBlock-

If you are having CVS or blue light related problems, we offer 3 solutions, Mojo BluBlock Tints, Mojo BluBlock AR anti-reflective coating, and our new APEX BluBlock AR-T anti-reflective coating. You can get these tints or coatings with or without a reading power. (No reading power needed? Select "Plano 0.00" for each eye.)  

1. Mojo BluBlock Tints.

Tinted lenses are a great alternative to AR coatings if you are a person that is fairly light sensitive or severly photophobic.

We have recently introduced our new line of reformulated and optimized Mojo BluBlock Tints. These are new types of lens tints in colors and depths very similar to what we offered previously, however these new tints progressively filter blue light/HEV more efficiently while allowing beneficial light through to your eyes.

(We have developed, tested, and optimized each of these new tint colors to acheive the best possible Wertheim factor for that color. In our testing we were able to acheive very high Wertheim factors (51!) with highly saturated yellow and amber blue block colors, but too much good light was being filtered and like most of the intensely tinted blue blockers sold on the internet, were awful to see through and looked bad too. These types of highly saturated tints can be useful for people with very specific vision health problems but are not necessary for the vast majority of computer users.)

With our great collection of frames you can have the perfect pair of monitor reading glasses for night or day. Like most of our readers, you can select from no power to +4.00 in either eye. The lenses are included in the price. They are aspheric polycarbonate filtering UV to 400nm, with a great scratch resistant coating. You just choose the add-on you want.

Learn all about our new Mojo BluBlock Tints and the Wertheim Factor.

2. Mojo BluBlock AR Coating- An alternative to having a tint. Mojo BluBlock AR is our new premium anti-reflective coating that reflects away, as opposed to filtering out unwanted blue light (Near UV-A) from computer screens, iPads and tablets. There is no tint in the lenses. They are super clear polycarbonate and include scratch resistance and a hydrophobic coating that makes them easy to clean.


  • Reflected Blue light to 470nm. Provides optimum comfort with clearer vision and increased contrast sensitivity.
  • 40% increase of light transmission to your eyes. (Good light, not bad light)
  • Powerful Nano-organic scratch resistance, and Plasma-Ion anti-static properties which prevents dust accumulation.
  • Easy-Clean surface makes it easier to clean and continues to maintain clean lenses.
  • Toughest Impact- Best in class with 170% increase in impact resistance. (Great for wearers exposed to hazardous environments.) 

3. APEX BluBlock AR-T Coating- AR+ tint. APEX BluBlock AR-T has the same features as the Mojo BluBlock AR but also has a light, 1% amber tint which provides increased contrast. They are very thin polycarbonate and include scratch resistance and a hydrophobic coating that makes them easy to clean. (Available in full rim single vision reading glasses only.)


  • 1% amber blue block tint.
  • Reflected Blue light to 470nm. Provides optimum comfort with clearer vision and increased contrast sensitivity.
  • 40% increase of light transmission to your eyes. (Good light, not bad light)
  • Powerful Nano-organic scratch resistance, and Plasma-Ion anti-static properties which prevents dust accumulation.
  • Easy-Clean surface makes it easier to clean and continues to maintain clean lenses.
  • Toughest Impact- Best in class with 170% increase in impact resistance. (Great for wearers exposed to hazardous environments.)

MojoBluBlock Tints vs. Mojo BluBlock AR - Both options protect your eyes from blue light. See our BluBlock Guide for help in selecting the right blue block option option for you.

Choosing the right power-

Up Close Reading Glasses- Most people read their tablets or iPads at 12-14 inches away. Choose your up-close reading power.

Computer Reading Glasses- A typical computer user views the screen at about arm's length. Choose half of your up-close reading power. Ex: +1.50 for up close reading, choose +0.75 for computer use.

No Reading Power- Select Plano 0.00 for each eye.

Mojo Blue Block Reading Glasses- Our Options:



All single vision Reading Glasses - Powers from zero to +4.00 in either eye.

Bifocal Reading Glasses - No power at the top and the same power each eye at the bottom from +1.00 to +3.00. All Mojo BluBlock tints are an option as well as non-blue block pink and blue.

Computer Bifocals - Arms' length computer power at the top with up-close reading power at the bottom. You can either get these with an AR Anti-reflective coating (not blue block) to cut computer glare or our Mojo BluBlock Tints. 

We have now included our Mojo BluBlock AR and Mojo BluBlock Tints as options on all of our single vision Mens' and Womens' reading glasses. Apex BluBlock AR-T is also available on full frames in those categories.


Recent Questions and Concerns.

Is all blue light bad for me? No, Not all blue light is bad! Blue light, the non-offensive type, is important for good vision and vision health.

How much blue light do your AR and tints block? All of the bad blue light which is to about 455nm. Our AR and tints are rated to 470nm. We use the Wertheim Factor to rate the quality of our blue block tints as it is accurate in describing blue light filtration/good light transmittance. It is much more useful than nm cut-offs which aren't accurate anyway.

Can Blue Light Actually Damage My Eyes? According to several studies, there is a strong possiblity that intensive, blue light (Near UV-A) exposure, can possibly cause retinal damage and senile macular degeneration. Some people are more at-risk than others, especially the young.

Studies are indicating that a small part of the UV spectrum, Near UV-A at 395 to 440nm is not only causing problems like eye strain and insomnia, but also causing more serious eye-health problems. It has been known for a long time that UV-A and UV-B (280 to 400nm) light are damaging to the eyes. (It also damages your skin) UV-400 filters have been available (or inherent in certain lens materials) in eyeglass lenses for the last 40 years or so. It is not particularly surprising that this part of the Near UV-A spectrum is also an issue especially with long exposure to Near UV-A from electronic devices.

While some people don't experience problems like insomnia or eye strain, it doesn't mean that their eyes are not at risk.

How do Blue Light Issues relate to Computer Vision Syndrome? Computer Vision Syndrome (CVS) is a grouping of visual problems related to issues like glare, and extended focussing on one set point, a computer screen. The glare issues can be resolved with Anti-reflective computer screens or covers, or eyeglass lenses with anti-reflective coatings. The other issue is related to your eyes' ability to "accomodate" at different viewing distances. (If you stare at a pencil at 20 inches in front of your eyes for 8 hours a day, I can guarantee that you will eventually have problems shifting focus to nearer and farther points.) The solution to CVS is Computer Reading Glasses with an AR Coating or Computer Bifocals with AR Coating, for people that require a computer distance reading power and a near distance power.

I think that "Blue Light" issues will eventually be included as a part of the syndrome, in "Computer Vision Sydrome".

I experience these Blue-Light problems, especially when reading at night. This is a CVS and blue light issue.

Tips: Ambient light and reading properly- If you want to keep your eyes in optimal health, do these 3 things:

1. Reading at night- Have a background light source and have a light source directed to your reading material. The more light on what you are reading, the better.

2. Whether reading at night or during the day it is very important to shift your focus from near to far every five minutes or so. If you focus your eyes at a near point for long periods, your eyes will eventually lose the ability to accommodate to different distances, and you will need reading glasses sooner.

3. Get glasses with our Mojo BluBlock Tint or Mojo BluBlock AR. Available with or without magnification and in single vision prescription powers.

What About E-Ink Screens? I was an early adopter of the Kindle and I have to say, it did what it did very well. I love matte screens but hate the very low (no) value internet experience. In daylight, the Kindle was readable indoors and outside with no eye strain and absolutely no glare outside. It was very light weight and comfortable to hold. The problem was that in order to read at night, I had to put it in a cover and attach a book light which trippled the weight, making it uncomfortable to hold for long periods.

Here's the thing- as far as CVS and blue light, and their related vision issues, there is no evidence that E-Ink screens are any better than LED screens.

Can I test my blue block readers with online spectrum charts? You can but the results will not be accurate. Here is a spectrum chart-


"Computer screens and monitors produce three colors: Red, Green and Blue. Simulating Violet just doesn't work. A filter (glasses) with a cutoff at 520nm (shown in this spectral curve) will block blue below 520nm, but any green that the monitor puts out will be shown. If the two strips of colored spectrum were further apart so that the top one could be viewed through the filter (glasses) while the bottom one was seen unfiltered, they would look a lot alike." -Dr. William F. Moore (One of the 3 inventors of the Wertheim Factor.)

This relates to why we use the Wertheim Factor. We use a special UV/Blue Light Spectrometer that shows us peak cut-offs at various ranges from 395 to 550 as well as the actual Wertheim Factor of that lens.

A very highly saturated yellow or amber or orange lens will make everything look less blue but they will also filter out way too much beneficial light and look bad doing it.




Latest Customer Reviews for Mojo BluBlock-

"I didn't know what I was missing! I have used regular off the shelf reading glasses for working on the computer but my eyes were always tired afterwards. I also work under florescent lights. Wow! What a difference these computer glasses made. I am very pleases with the results. I will have to buy a few more pairs!" - Malinda P.


"The most recent pair I got from you guys I added the Mojo Blue Blocker AR coating - what a difference - having had cataract surgery with multifocal lenses I can read fine and see distance. But when I work on my large computer screen at home it's about 2.5 - 3 feet away which is my dead spot.  The first pair (once I got the power straight) caused some fatigue and strain, but when I got the last pair with the coating, wow!  I can sit all day in front of the screen without any problems.   Great glasses.  Thanks!!"  -Alan B.


"I have been using drugstore readers now for about 3 years. I am one who never had to wear glasses and never wanted to. However age has other plans. Since I love to read I had to give in. I found that after a month or so, my readers would start to fog or just not work as well. I was having a lot of eyestrain from forcing my reading by squinting or moving my book back and forth until I had no choice but to buy yet another pair."

"After a couple of years, I started having a harder and harder time reading on the computer. (Standard desktop). I,unfortunately, started slipping on my readers thinking this would help. Bad, Bad, decision! I soon could not read the computer without the readers. Then, my eyestrain, headaches, dizziness, exploded. I tried going to two diffferent eye doctors. Each told me different things, patted me on the head, and sent me on my way. Needless to say, I was very very frustrated."

"I began an online search to help myself discover a solution. I soon learned that normal reading uses one's near vision and computer reading
uses one's intermediate vision. By using my readers for both, I was confusing my eye muscles. The strain this put on my eyes was what was contributing so much to my problems. I also learned that drugstore readers DO NOT use optician quality lenses. This is why they do not last and are ultimately harmful to your eyes."

"I then discovered Through several very informative email exchanges, I learned that they had several quality options for me. I tried bifocal readers, mojo bluebock monitor readers and AR readers the latter two both with computer intermediate vision. This I was informed is 1/2 of your near reading magnification. For me this is a +1.25. All three had high quality frames and lenses. My final personal choice was the AR (anti reflective) readers. Just trying these for 2 days allowed me to discern a drastic difference in clarity and brightness. I have had them for about a week now, and I no longer am having any headaches!!"

"The mojo blublock monitor readers are also excellent. I do not use a smart phone, or a tablet, or a laptop, but both my husband and son in law do. We all three noticed an amazing difference when viewing each of these items through the mojo lenses. They have done an excellent job in creating a lens coating that decreases the blue light from back lit items without interfering with one's ability to clearly see print, pictures, and movies for extended periods of time. I believe these are a must for anyone who uses handheld back lit devices. We all only have one set of eyes, and in today's world, taking care of them has never been more important."

"The folks at Reading Glasses Etc have done an amazing job with keeping up with technology and offering quality well made eyewear solutions for a wide variety of needs at a very reasonable price.I believe they hold themselves to a high standard and provide excellent personal customer service. You will not regret making your purchase with them."

"I truly appreciate the help and advice. I am enjoying my computer readers and can't wait to get my regular readers."



"Mojo BluBlock Tint: These are amazing in my opinion.

The 15% Blue Block tint depth gives you just enough tint to block that blue haze that is all around us during sunny bright day, or if you sitting in a front of a laptop, or holding a tablet. I did not notice that blue haze that outdoor offers until I wore the these glasses for a while. Not only do they block the haze but they make everything sharper, and colors are little stronger and they pop.  They don't do much difference indoors as far as looking around, but they help with looking at laptop or watching tv, or reading e-book on my cellphone.

The 30% Blue Block tint works just as well as 15% but little darker. It does change some of the colors I see."

-Suad B.

Other Resources: (Takes you off site) - An awareness campaign website started in 2014 sponsored by Essilor Canada, Nikon Optical Canada Inc, and Shamir Optical Industry LTD. This site has all kinds of great information related to blue light, and protecting your vision.

The Lowdown On Blue Light  -Review of Optometry (An excellent read.)

The Effects of Blue Light on Ocular Health - Elaine Kitchel, M.Ed.

Blue Light Disturbs Sleep... -Washington Post

Blue Light Has A Dark Side  -Harvard Health Publications

Log Off Before You Nod Off  -The Guardian

Screens May Be Terrible For You And Now We Know Why - Brandon Keim,

10-blue-light-filters-to-relieve-computer-eye-strain-help-you-sleep-better-etc/ -Glarminy

Blue Filter Light Sensitivity -

There are also briefs that you can view on studies that have been conducted and posted at, like this one-

At NIH- How much blue light should an IOL transmit?

We are following these scientific publications and news articles and will update this page as we find them.

The Wertheim Factor - Patent Application