Optical Glossary

As we are run and owned by optometrists, we therefore thought it wise to share some of the key optical terms with you. This list is endless, however, we will try include as much as possible and constantly update the glossary. If there is anything on this list that we are missing, please let us know at or call us on 02) 4907 6880


Bridge - The bridge refers to the width between the lenses of the spectacle or sunglass frame. It is the part of the frame that sits rigth above your nose and will be of varying width depending on your personal requirements.

Eye Size - Measures the width from the very end of one side of the frame to the other. For example, 51 - refers to 51 milimetres.

Nose Pad - The nose pads are usually two (but can be one as well) pads situated just below the bridge. These pads are used to rest the middle of the frame on your nose comfortably. These can be adjusted either wider apart of closer together.


Antireflective Coating (Multicoat) - Antireflective coating is a surface coating that makes the lenses more attractive, clearer and therefore more satisfying. They have the effect of reducing glare caused by reflections and lights. We recommend antireflective coating when spending a lot of time under lights, in front of computers and in the car. Although the glassesgalore lenses still have a quality coating, you will definitely enjoy the benefits of antireflective coating for a minimal cost. 

Antiscratch Coating - A special coating that reduces the chance of the lens scratching. All lenses on have antiscratch coating. Note, that antiscratch coating does not make prescription lenses absolutely immune from potential scratch damage.

G-15 - The green/grey lens that we offer carries the technical term G-15. It is a great sunglass lens and possibly the most popular out there.

Glass Lenses - Glass lenses have been superceded by plastic lenses (cr39) and we therefore do not offer them. They are heavier and less flattering due to thickness, which makes them inferior to plastic (in our opinion!).

Freeform Multifocals - All multifocal lenses purchased on is a Freeform Multifocal. Freeform Multifocal lenses are an advancement from the basic multifocal that most wearers purchase today. It is state-of-the-art technology that widens the wearer's field of view, provides a far improved peripheral vision with minimal distortion and finally are lighter and more comfortable for the wearer. We believe that every multifocal wearer should be wearing Freeform Multifocals, however they are not cheap in bricks and mortar retail stores. That's why gives you a great opportunity to purchase the best multifocal lenses on the market at a fraction of the price.

Multifocal (Progressive/No Line Bifocal)- Multifocal lenses allow you to see near and far distances in the one lens, without having any line through the middle, ruining the asthetics. All multifocal lenses sold on this website are Freeform technology, which is superior to standard multifocal lenses bought at many retail chains for an even higher price! (see Freeform)

Polarized - A polarized coating has the effect of providing an extra filter on a sunglass in order to reduce the amount of glare caused by light. These are the most effective form of sunglass, providing a clear and crisp view in any condition. Polarized lenses are a number one choice for those spending a lot of time on the snow, sand, water or any other type of reflective surface.

Polycarbonate - Polycarbonate lenses are what we use for all rimless, semi-rimless and childrens frames. These extra-tough prescription lenses are used to prevent chipping and shattering caused by impact. This makes them a safer and longer lasting option. They also have UV protection. Included in the price of all rimless, semi-rimless and childrens frames are polycarbonate extra-tough lenses for this reason.

Tint - If you see a frame that you like, you may want to have it as a sunglass. We can do this for you by tinting it a colour. The colours available are green/grey, brown and grey. If there is a colour that you particularly want, that is outside of this colour range, contact us and we will see if it can be arranged.

Transition (Photocromatic) - Transition lenses are an extremely popular choice for individuals who require a prescription spectacle and sunglass in one. Transition lenses achieve this by being light when indoors and turning dark when outside and exposed to sun. This is a great way to save money and be convenient, as you only will need to wear the one pair of prescription glasses, without carrying a sunglass around! Transition lenses block out UV and other harmful rays.

UV - Ultraviolet (UV) coating is a special lens surface to reduce ultraviolet radiation penetrating the eyes. Ultraviolet radiation can cause serious problems related with eye health.


Axis - This measurement can be anywhere between 1 and 180 and is used to correct an astigmatism.

Pupillary Distance (PD) - The PD refers to the distance between the centre of your pupils of your eyes.

Rx - This is an abbreviation for prescription and may be seen on the prescription given to you by your optometrist.