Tech Talk

The Basics

1/ UV - Ultra Violet - Invisible light rays are considered harmful to the human eye and if not protected will cause cataract - Main source - The sun

2/ IR - Infra Red - Heat rays are also damaging to the unprotected human eye as it affects the cornea causing a drying effect - Main sources: the sun/mechanically generated such as gas welding

3/ Blue Light - This is the light that causes eyestrain and fatigue. Main sources - The sun and some artificial light such as neon

4/ Nm - Nanometre - A unit measure of light waves

5/ UV 380 Lenses - Blocks out 99.9 -100% of UV rays up to 380 nanometres - mainly used in clear lenses

6/ UV 400 Lenses - Block out 99.9 -100% of UV rays up to 400 nanometres - mainly used in tinted lenses

7/ Zero Power - Another way of saying there’s no lens magnification and that it’s distortion free

8/ Base Lens - Relates to lens curvature. A prefix number signifies the amount of curve on a lens. The bigger the number the bigger the curve. Most wrap around designs are normally between 8 - 10 base

9/ Medium Impact Approved (AS/NZS 1337.1) - When an eye protector is subjected to and passes a series of accredited test procedures where a 6.35mm diameter steel ball is projected at a velocity of 40m/sec

10/ Co-molded - The bonding of two materials during manufacturing stage (e.g Injection moulding)

11/ Photochromatic - The automatic darkening process that occurs when a photochromatic lens is exposed to UV sunlight

12/ Rx Ready - Prescription able

PC Lenses

Made from tough stuff called Polycarbonate (Plastic). It’s shatter proof, lightweight, optically correct and blocks out 99.9 - 100% of the sun’s rays (UVA - UVB) in all shades….even clear! All Scope PC lenses in clear, smoke, amber and copper are C-MaxTM coated (anti-fog/hard coat) as standard on both lens surfaces. All mirror lenses are hard coated.

Lens Category


Untinted and tinted spectacles/lenses are categorised by the amount of light allowed to pass through the lens. This is called the luminous transmittance. A lens with 18% transmittance allows 18% of visible light to pass through to the lens. Alternatively it restricts 72% of visible light passing through the lens.

Lens Category



Very low sun glare reduction


Limited Sunglare reduction, NOT SUITABLE FOR DRIVING AT NIGHT


Medium sun glare reduction


High sun glare reduction


Special Purpose Very high sun glare reduction


The majority of our range consists of two main types of materials.

1) a. Polycarbonate - It’s strong, Iightweight and depending on the frame design can also be slightly adjusted for fit

b. Co-molded - A great combination of polycarbonate with mainly rubber compounds bonded together resulting in lightweight and very comfortable designs

2) Nylon - No big secret to this material - bend it, stretch it, twist it - it’s almost unbreakable. Depending on the level of humidity, nylon frames will also naturally absorb atmospheric moisture making them softer and more flexible

Lens Markings

As required by AS/NZS 1337.1, all approved products are to indicate relevant markings as shown.

Single lens models - one side

Dual lens models - both sides

Scope Lens Mark

The letter I Indicates Medium Impact Approved

The letter O indicates the lens can be used either indoors or out & mainly seen on clear & amber lenses. They will filter out UV but not glare.

The letter C indicates the product is approved for liquid splash.

The letter M indicates the product has been approved for Molten Metal/Hot Solids

The number indicates the lens shade approved for Gas Welding as per AS/NZS 1338

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Click here to view all lens transmission rates.