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

Classification

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	Definitions
0	Very low sun glare reduction
1	Limited Sunglare reduction, NOT SUITABLE FOR DRIVING AT NIGHT
2	Medium sun glare reduction
3	High sun glare reduction
4	Special Purpose Very high sun glare reduction

Frames

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