Lens Quality

Eyeglasses.com produces the highest quality eyeglass lenses available.  If we don't make your lenses perfectly, we will remake your lenses or refund 100% of your money.  Guaranteed perfect lenses.  How can we make this guarantee? Simple: we don't make your lenses. 

Making perfect eyeglasses is a science and an art rolled into one.  All of our lenses are made by our Essilor-partner lab which has over 50 employees involved in making every pair of lenses.  Essilor is the largest and highest quality eyeglass lens maker in the world, with over 200 lens labs in the United States alone.  So when you ask Eyeglasses.com to make your lenses, you are not getting a local guy cutting lenses in the back room on aged equipment.  You are getting the very best plastic (or glass) lens, installed in a quality controlled, ISO 9000 lens-making laboratory.  Your lenses pass through 16-21 quality control stations before they are finally released.  If the lenses fail at any one of those stations, they are returned for further processing, or they are scrapped and begun again. 

Perfect lenses, guaranteed.

Essilor is the world leader in eyeglass lenses.  Here are some links:  Essilor created the finest progressive lenses (Varilux lenses, Varilux Definity®, Varilux Comfort®, Varilux Physio®, Varilux Ellipse®), the finest lens coating (Crizal), and the finest single vision lenses on the market today (Orma, Thin&Lite, and Airwear).  But if none of these lenses appeal to you, we can also offer Zeiss, Transition, Younger, Trivex, Kodak, Pentax, Sola, Hoya, and other lens brands - just ask for a quote.

To make perfect eyeglass lenses, getting the right lens is only half of the story.  The other half is the lens installation.  If you buy the best lens and it is installed wrong, you have wasted your money.  At Eyeglasses.com, you can be assured that you are getting the exact lens you ask for, and it is being installed with the very highest skill, attention to detail, and quality control.

What is an eyeglass lens?

Eyeglass lenses are nothing more than a carefully carved block of clear plastic. Lens quality is determined by four factors: 1) The clarity of the plastic, 2) the precision of the carving, 3) the accuracy of the prescription and PD measurement, and 4) the accuracy of the cutting of the lens to fit your frames.

Who makes the lens?

Several groups are involved in the making of lens. A problem in any one of these steps can lead to less effective vision correction by the lens. A good provider of eyeglass lenses will have relationships with the best lens quality providers, but will also check and re-check every lens before dispensing it. The store you choose to make your lenses must insist on quality at every level in order for you to receive the best quality product. This kind of quality control is essential in order to ensure consistent results.

Who is involved?

What they do

For example

The maker of the plastic Determines the clarity of the plastic. Essilor, Zeiss, Pentax, Seiko, many others.
The cutter of the plastic Determines the precision of the carving. The plastic maker does the surfacing for stock lenses.  The lens laboratory does the carving for surfaced lenses. 
The issuer of the prescription and pupillary distance measurement. Determines the optics for the lens such that it will work best for your eyes’ condition. An optometrist or ophthalmologist issues the prescription.  An eyewear store employee measures the pupillary distance.
The person that cuts (“edges”) the lens for your frame. Installs lenses so that the optical centers match the pupillary distance measurement. An eyewear store employee, or lens laboratory.

About the plastic manufacturers

Nowadays most quality lens plastic in made in the Far East. It is made in large pieces called blanks which are round about four inches in diameter and about half an inch thick. There are different types and qualities of blanks. The quality is determined by the clarity, meaning the absence of miasms (small bubbles or inconsistencies which can only be seen with a microscope). The lower lens quality and less expensive plastics have more miasms which, although you cannot see them with the naked eye, can still add up to decreased visual acuity.

At Eyeglasses.com, we only use better or best quality lens plastic made by well-known plastic suppliers. It is very easy for any eyewear retailer to cut their lens costs by 50% by switching to lower quality lens suppliers. We inspect every lens that we receive at least three times to ensure that it meets our standards. All of our suppliers have unconditional return policies for defects in lens quality.

About Lens Laboratories

There are two basic ways of cutting lenses, depending on the prescription. Most prescriptions fall within a standard range, called the stock range (on average the range is +/-8.00 sphere and up to +2.00 cylinder). Single vision lenses that are in the stock range are usually surfaced by the plastic makers in bulk by huge computerized machines. These lenses are then shipped to optical stores so that the store employees can edge the lenses into the frame.

Most multifocal lenses, and all lenses that fall outside of the stock prescription range, must be fashioned custom for each prescription. In these cases, plastic blanks (chunks of plastic) are shipped to lens laboratories where they are carved (surfaced) for each individual prescription. There are hundreds of lens laboratories around the country, several in each state. A typical lens laboratory will do a minimum of a few hundred lenses a day with a large staff of highly trained and experienced technicians. A few optical stores (like Lenscrafters) have small surfacing facilities in each of their stores doing much smaller lens volume.

To surface a lens, the lens laboratory takes the blank and puts it through a series of grinding machines, which grinds the surface the lens and shapes it exactly to the specifications of the prescription. Lens laboratories also provide other services like edging and mounting, which optical stores can choose to use or not, depending on whether they want to do that work themselves.

As with any custom service, the quality of the surfacing and any other services that the lab provides-- is determined by the experience and the expertise of the laboratory, its personnel, and the equipment it uses. We only use labs that employ a large staff of highly trained technicians, doing a large volume of lenses every day.

At Eyeglasses.com, we do none our own edging services ourselves, and all of it is done by our lens laboratories.  Most of our orders require stock lenses; all of our custom surfacing work is done by lens laboratories. The laboratories that we use each have many years of experience and do thousands of lenses each week. Each lab that we use inspects each lens several times during the manufacturing process. When we receive the finished product from the lab, we do our own final inspection.

Eye doctors: they can make mistakes

The optometrist (OD) or ophthalmologist (MD) that issues the prescription is not involved in the fashioning of the lens, but the prescription they issue is crucial to the overall effectiveness of the lens. Occasionally the OD or MD can issue a prescription that is not quite right. Also, it is possible for your eyes, and your prescription, to change rapidly during some stages of your life.

Pupillary distance PD measurement: who measures it?

Normally an optical store employee will take your PD measurement when you go to buy glasses. If you want more freedom to choose where to buy your eyeglasses, you should ask your optometrist or ophthalmologist to measure the PD during your exam. Usually they will not measure the PD unless you ask them to.

If you have your PD measurement and your prescription when you leave your eye doctors office, then you can buy glasses and lenses at any eyewear store. With your PD and your prescription, you will not be forced to go to an optical store to get your PD measurement, and then feel obliged to buy glasses from that store.

Edging lenses: Who does that?

Edging is performed in a number of different ways.  It can be done at the lens laboratory, or in the optical store.  Either way, it is not required in any state that the edging be done by a licensed person.  About one-half of the states in the United States have opticianry laws.  In those licensed states, edging can be done by an unlicensed person that is “overseen” by a licensed person.  The edging for most glasses made in this country is not performed by a licensed professional.  However, all of the edging that is done for Eyeglasses.com is done in a state-of-the-art lens laboratory.  When we ask our laboratory to do the edging, it is done by an employee/tradesman that does at least hundreds of jobs per day.  That person has a very high skill and accuracy level that we have found to deliver very high quality.

Eyeglasses Categories

There are many different types of prescription glasses that are out there. For example, most eyeglasses frames are unisex, meaning they work both for men and women.  We have created some categories for mens eyeglasses, womens eyeglasses, and kids eyeglasses to make it a little easier for you.

If you have a high prescription, you may be looking for small eyeglasses so that the lens is not too thick at the edges.  If you are a large person and have trouble finding eyeglasses big enough to fit you, check out our selection of big eyeglasses.

The retro eyeglasses look is all the rage now, and coming back strong.  We have the largest selection of round eyeglasses on the internet, and we also have a beautiful collection of vintage eyeglasses and retro eyeglasses.


Mike Conforti

Mike Conforti wrote on 05/12/10 10:53 PM

I have approximately a -9.00 for eyeglasses and my lenses currently are 1.54. I would like to wear my eye glasses more often but, the lenses make my eyes 1/2 the size they are. I am wondering if I go to a 1.74 lens, if this would make my eye look normal and if so which lense mfg should I use.

Thank You
Mark Agnew

Mark Agnew wrote on 05/13/10 6:02 AM

The Essilor 1.74 lens is the highest index and best lens we know of. On a 42mm frame, it will have a 1.5mm thickness, which is a "normal" size and will cause minimal eye "shrinkage".
Nicole Roberts

Nicole Roberts wrote on 10/22/10 2:04 PM

At the top, the lens in the right frame of my glasses is a little outside of the frame. Is this normal?
Mark Agnew

Mark Agnew wrote on 10/22/10 2:31 PM

"Normal" varies for every frame. We would be happy to check it for you, if you send your glasses to us.
Gary Lee

Gary Lee wrote on 10/27/10 1:38 PM

Zeiss lenses: Is this a "process" or the "material?" I am very familiar with Zeiss camera lenses. Would eyeglass lenses be of the same world class quality?
Mark Agnew

Mark Agnew wrote on 10/28/10 1:01 PM

Zeiss lenses are made by Zeiss in a Zeiss-authorized lens lab. Lenses are made of plastic, not glass which is used in camera lenses. The question, "Are Zeiss lenses better than all other eyeglass lenses?" is open to debate by all of the lens makers and we do not have an opinion on that. Zeiss does make excellent eyeglass lenses.


Jim wrote on 01/09/11 7:28 AM

How do we differentiate the poor quality lens from the high quality ones? Do brands like Zeiss and Seiko have quality assurance marks on the lenses? Thanks.
Mark Agnew

Mark Agnew wrote on 01/14/11 11:41 AM

It is difficult to asses the quality differences among lenses. Basically, with better lenses it is easy to see (fewer miasms in the plastic). Makers to not put "quality assurance" marks on the lenses. There is no objective standard for lens quality, no "UL" type label. Also, the clarity of the plastic is only part of the equation. Getting the RX correct is the eye doctor's job and often the source of the problem.

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