Eyewear A to Z

All you need to know about your Eyewear.


Cellulose acetate (first assembled in 1865). It is a trademarked material for eyeglasses frames because of its capability to fit an array of patterns and colours.


It is a piece of information for people with prescription lenses, usually found on their prescription paper. ADD is a short form of Addition, showing the amount of magnification power to be added on the multifocal lens for the particular person to see clearly.

Anti-reflection coating

Coatings added to the lens to reduce reflection and get the most transparent and error-free vision. It further adds quality and value to the lens.

Anti-Scratch coating

Scratches are typical of all glasses, but these scratches can be highly reduced with the help of anti-scratch coating. In addition, it does not affect the lens basis or visual clarity.


is a condition that occurs when the shape of the cornea, which is the central portion of the eye, is slightly irregular. This causes light to focus on the back of the eye instead of the front. Glasses can be a good correction for it.


A number ranging from 1 to 180 written on the prescription paper, which tells the doctor the direction of an individual’s astigmatism correction.


Lens bevels are the double angle cut onto the edges of glasses lenses which may sometimes hinder glazing for lens technicians

Bifocal Lenses

A single lens containing two different portions, an upper section and a small lower portion. The upper part is for distance reading, while the small lower part is viewing close things.

Blade Temple

An eyeglass temple, also called paddle temple, designed in a straight form without a drop end.

Blue Light Lenses

Blue light is a secondary component of the visible light spectrum emitted by the sun and electronic devices. It can be filtered out by blue-light-filtering lenses


The central section of the glasses frame where the glass rests on the nose. It comes in different sizes and different styles, mainly depending on the material of the frame.

Cat-eye Frame

Altina Schinsi Miranda is known for inventing the cool looking cat-eye-shaped frame. She was a window display maker in Manhattan when she saw the hideousness of most eyeglasses. Then, inspired by the masks she saw in Venice; she created her pair of frames. As time goes on, people decide to make it theirs by modernizing her idea and adding little touches to give it a more cool look.


This contains purified cellulose and acetic acid coloured with disseminating dyes

Colour blindness

People with colour blindness have a hard time seeing colours the way they really are. In most cases, they can’t see them clear enough. This condition is inherited, and it affects more women than men.


This refers to the strengthening of acetate. Acetate is mixed and poured into blocks and is allowed to harden.

Curl Sides

This is one of the most suitable types of the temple for children. It is curled at the very end of the temple, which is used to wrap around the ear.


The cylinder found on the prescription paper is a piece of information that shows the lens power needed to correct an individual’s astigmatism. It always goes along with the axis; you can’t have one without the other.

Demo lenses

Are lenses for demo use with limited purpose, and they do not require a prescription. After placing an order, a customised pair of glasses with your doctor’s prescription would be made.


This is the measurement of the refractive power of a lens. It is found on the prescription, and sometimes it is written as D.

Disperse Dye

This is a powdered dye mingled with neutral acetate amalgamation to give the acetate its colour.

Distance Between Lenses

Mostly shortened to DBL. The name explains it all. The distance between lenses is measured from the inward.

Double Aspheric Lenses

These lenses are known for their strong prescription. They contain curvatures that make them lighter, thinner, and flatter; these curvatures are on both front and rear surfaces

Double Rivet Hinge

This is a traditional metal type of hinge that is fastened using two rivets for the frame temple and two rivets through the frame front. It can be aligned in such a way the rivets can be vertical or horizontal.

Dowel Screw

Also called a “flat head” or “slot screw,” these are extremely common screw-type. These tiny screws are what holds your entire glasses frame together and are arguably one of the most essential parts of glasses frames.

Drive Wear

These glasses are specifically made for driving, they are primarily photochromic, so they darken when the sun shines bright and gets clear when the lighting condition is dimmed.

Drop end Temple

This temple’s last end hooks downward and creates a secure fit behind the ears. It is a modern style used in most types of frames.

Ear Hook

These are hooks normally made of plastic that can be attached to the temples to make the frame more fit and prevent it from slipping down the nose.


The part of the frame where the temples connect to the frame front. They vary in style and size, depending on the type of the glass temple.

Extended sizes

Not everyone has the same face size, so frames of the same styles are made in different sizes, simply to fit more faces.


Well, this is the main reason why we are all here. These incredible, cute, ball-like duos on our faces allow us to wear the variety of smart, cool-looking glasses that we like

Eye Size

This is the measurement of the lens frame horizontally from the broadest part of the frame in millimetres


The pain you get from stressing your eyes might be from staring at a mobile device screen for long or from reading too small texts for your eyes to see clearly without stressing.


Any material or rim that surrounds the lens frame. The eyewire is what golds the lenses intact.


People who have trouble reading or seeing things/objects near them but have no trouble seeing far objects are said to be farsighted.


If your pupils are at the center or almost at the center of your lens, the lenses did not extend past the side of your face, the frames don’t continuously slide down your nose, the edge of the temple doesn’t go too far behind your ears, and your eyebrows are inside the frame, then your eyeglass is fit.

Frame Front

This could be rimless, semi-rimless or full-rim. These are the different styles of the glasses frame that holds the lenses.

Full rim

These are glasses that have their lenses fully enclosed by the frame.


If not for “glass”, none of us would be here. Thanks to our beloved glasses for making us look pretty, cool, smart and always confident.


Plural of Glass.

Glass Lens

These lenses offer clearer vision than plastic lenses, and they can be made with thinner materials, making them more attractive on your face. With fewer impurities compared to plastic lenses, they are also the first and oldest version of lenses.


This is how different lenses fit into various frames. There are several ways of glazing, depending on the material of the frame.

Gold Frames

Glass frames are made in various styles and colours, one of which is the popular gold colour; whether it is actually made of gold or not, gold plating has been highly liked and is still a modern technique.

Gradient Lens Tint

This is a style of lens tint where the lens is dark at the top and gradually fades down to the bottom.

Half Joint

Also known as “temple half joint” or ”frame half joint”, it is the one half of a glass hinge. There are four half joints in every frame which connect to the left and right temple.


A case to store your glasses anytime you are not wearing them. There are varieties of glass cases, but the hard case is considered the best type of glass case.

Hard multi-coat

Anti-reflective and anti-scratch coatings in a multi-layer lens coating.

High-index Lenses

Any optical lens with a refractive index above 1.5 is called a high-index lens. These lenses are recommended for people with strong prescriptions because they are more efficient.


Mostly made of steel, brass, or nickel alloy; this is the moving part that joins the frame front and the temple. It is also known as “Joint”.


A thin lens coating that wards off the water.


This is a material that helps glasses wearers that have allergic reactions.

Interpupillary Distance

The total distance between the centers of the eyes. The interpupillary distance is measured in millimeters.


A tissue in front of the eye that controls the pupil and the amount of light that enters the eyes


Jogging is good for our health, as we all know, but a couple of questions arise whether it is safe to jog while wearing glasses; well, it is 100% secure to go jogging with your cute-looking glasses.

Keyhole Bridge

It looks like its name (keyhole); it is a bridge-type that resembles an old modern keyhole, mostly used on full-rimmed glasses.

Leather Glasses

Right from time, leather has always been a strong material for making glass frames.


This is the most essential part of eyewear. The transmissive solid used to focus or disperse light could be made of glass or high index plastic and in different shapes, depending on the frame type (rimless, semi-rimless, full-rim).


Plural of the lens.

Lens Cloth

A small-sized micro-fibre material that is used to clean the lens of glass. The lens cloth is best stored in a glass case.

Lens diameter

The lens diameter is mostly written on the inside surface of the arm, could be pad printed or laser etched.

Lens Material

High index, plastic and polycarbonate are the three primary materials that are used in making glass lenses. It is essential to know which material is best for you because each material’s thickness, weight and comfort differ..

Lens Tint

Blue, Brown, G-15, Gradient, Gray, Purple, Rose and Yellow are the most known lens tint but are available in various colours and tints.


This is the angle where the front frame meets with the temple, it is also known as the “Mitre”, and it is usually at angle 6°


We can’t keep moving without remembering our past. Lornettes are glasses with no temples; founded in 1770; these glasses have a stick or handle attached to them, which users would use to hold the glasses to their faces

Low Bridge Fit

Not every frame fits in every face, this type of frame is made for people with low nose bridges to fit well.

Low Index Lenses

Any optical lens with a refractive index below 1.5 is called a low-index lens. These lenses are suitable for people with low prescription because they are cheaper than high index lenses. However, they are thick and less efficient in binding light.

Melanin Polarized Lenses

These types of lenses provide double the protection you get from other sunglasses. Lenses that contain melanin are best for outdoors, and they provide strong protection against blue light and UV.

Mirrored Coating

If you still want to block out more light from entering your eyes, this is a good option. The mirrored coating is also known as “flash coating”, blocks an additional 10 to 60 per cent of more light than an uncoated lens.

Mixed Material

Some frames are not made of a single material. Acetate can be combined or flourished with metal to produce a good looking and high-quality frame.


Going back to the 19th century, this was a popular one-eyed corrective lens. It is mainly fixed within a round, ring-like rim made of wire. It has a chain or a string attached to its wireframe.

Mop Polishing

The polishing of acetate frames and temples with motorised rotation mop and polishing compounds to smoothen the acetate’s surface to achieve a high finish. It is also known as hand, rag or wheel polishing.


People who have trouble reading or seeing things/objects far from them but have no problem in seeing/reading close objects are said to have myopia, otherwise known as near-sightedness.

Nose bridge

The slope between your eyes. It is where the frame hangs on your nose.

Nose pad

These are twin pads that hang beside the glass frame. They rest beside the nose and secure the glasses on your face.


This stands for “ocular centre”. It is the pupil’s location behind the glass lens, measured using both vertical and horizontal in millimetres.

Ocular height

The measurement from the centre of the pupil to the bottom of the lens. This measurement is used to correctly align the pupil with the optical centres of the lenses.


Abbreviation for “oculus dexter”, which is the Latin name for “right eye”.


This is a lens coating that helps repel oil and grease, and it makes it easier to clean off dirt and dust


Opticians are technicians trained to design, verify and fit eyeglass lenses and frames, contact lenses, and other devices to correct eyesight. They use prescriptions supplied by ophthalmologists or optometrists.


Are trained eye doctors who run tests, diagnose any eye disease, and prescribe glasses/contacts for a person.


Abbreviation for “oculus sinister”, which is the Latin name for “left eye”


An instrument used by a doctor during an eye examination. It is huge and it is used for refraction.


These are your non-prescription lenses.

Polarised lenses

These lenses have chemicals applied to them to filter light that passes through it. As a result, eliminates glare and helps reduce eyestrain.

Polycarbonate lenses

This is the safest type of lens to go for, they don’t break, and they are said to be the best option for children’s eyewear due to their safety, lightweight and high impact resistance. They were first founded in the 70s.

Prescription paper

The paper where the eye test/examination details are listed. It is advised to take an eye examination after every two years.

Prescription glasses

These glasses give your eyes the superpower that suits the eyes needs to see/read clearly.


For correction of misalignment of your eyes, an amount of prismatic power is needed; this is written on your prescription paper by the doctor after running the required tests

Pupillary Distance

This is the distance between your pupils. It is measured in millimetres and is used to align the lenses to fit your selected frame


Quavious Keyate Marshall, known professionally as Quavo, is an American rapper, singer, songwriter, and record producer. He lives a stylish lifestyle and is a fan of super cool-looking eyeglasses. Quavo spends a lot of cash when it comes to eyewear, which is no doubt the reason why he’s always good-looking. Well, that’s better than leaving “Q” blank.

Reading Glasses

These could be prescription or non-prescription glasses that make it easier for you to read at close range without stretching the eyes.

Regular bridge

Also called a saddle bridge, regular bridges are U-shaped and are simple and continuous in their form.


An eyeglass that is not surrounded/supported by any rim. Its temples hold the lens together using screws and a metal bridge between the two lenses.

Segment height

To create accurate progressive lenses, the vertical measurement of the segment height is required. It is measured in millimetres, and it tells the lab experts where to start a person’s progression.

Single-vision lenses

The lenses that correct only one vision, whether far or nearsightedness, are known as single vision lenses.


This is an indication of how strong the lens needs to be. It is written on the prescription paper.

Spherical lenses

Lenses with single curvature on the front surface are known as spherical lenses; they are known as the simplest form of lenses.

Splay angle

Splay Angle is essential on regular bridge frames if the rims are remarkably thick and are more often specified on keyhole bridges.

Spring Hinge

Some hinges contain inbuilt springs; this spring is suitable for a greater amount of let-back angle.


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Sunk Hinge

This is also known as “hidden hinge”, its method of attachment is hidden inside the front of the frame as it adores decorative rivets. They are easy to insert but barely repairable


This is the thin nylon cord fixed underneath the semi-rimless frame to support its lens.


Another name for the arm or legs of an eyeglass frame. It is the part that holds the frame in place and runs beside your face to hang above your ears.

Temple length

Not every temple fits every face; that’s why temples come in different lengths, measured in millimetres. A temples length is the third number found on a glass pad or etched on the inside of the temple.


A coat, usually dark applied to the lens of an eyeglass, mainly to reduce the amount of light that passes through it. There are several varieties of tints and reasons why they are applied.


The end-point of the temple, furthest away from the frame front. Frame chains may be attached to temple tips as a way of wearing your glasses around your neck.


Titanium is used in making glasses because it is a durable substance that never rusts. Speaking of strength and durability, titanium is the best option to go for.


Actual acetate being designed to look like a fancy tortoiseshell. The origin of this frame was from an actual real-life tortoise, but the hunting of these creatures for eyeglasses was stopped in the year 1973.

UV Light

UV is the acronym for ultraviolet. This is invincible electromagnetic radiation that surrounds us. Its primary source is from the sun, and you can experience sunburn when overexposed to UV light.

Visual Field

The area that an individual can see when their eyes are in a fixed place(not moving).

Wooden glasses

Wood can be used to make frames and temples. From the 13th century up to now, wooden glasses made from timber, birch or lime tree have been a good choice for many glasses users.


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An alphabet that sounds more like a question… you should buy our glasses, “Y”? Because you look fabulous in them.


The last letter of the alphabet.