Lenses and frame - COFRA Safety footwear Workwear PPE

LENSES

TRANSMISSION FACTOR (VLT)

The colour of the lenses plays a fundamental role in the management of brightness in the different work activities and in any environments in which they are used. With reference to this, EN ISO 12312-1:2022 European Standard (Eye and face protection-Sunglasses and related devices Part 1: Sunglasses for general use) classifies glasses in 5 categories from 0 to 4 based on VLT (Visible Light Transmission). This value indicates the light quantity transmitted to the eyes through the lenses, it is affected by the colour, by the thickness, by material and by treatments of lenses.

CATEGORY	COLOUR	VLT(%)
0	Clear or lightly coloured/darkened lenses	80÷100	Very limited reduction of sunlight
1	Lightly coloured/darkened lenses	43÷80	Limited reduction of sunlight
2	Medium coloured/darkened lenses	18÷43	Good protection against sunlight
3	Dark lenses	8÷18	High protection against sunlight
4	Very dark lenses	3÷8	Very high protection against sunlight (sea, snow, mountain or desert). Not recommended for driving and for street use

LENSES COLOUR

The effects of an unsuitable protective filter colour may cause: decrease of visual acuity, sensation of effort, headache and even nausea and dizziness. Different colours of the lenses allow to promote or preserve the perception of colours, of contrasts and visual acuity; furthermore, they may reduce reverberation and remove UV rays.

COLOUR	SCALE NUMBER	VLT(%)	DIRECTIONS
CLEAR	2C-1,2	88÷92	Recommended for indoor environments with good visibility conditions and for indoor applications, where the protection of the eyes against impact and most common risks is recommended. Moreover, they help to protect against ultraviolet rays. Applications: mechanical indoor work with good visibility conditions.
YELLOW	2C-1,2 2-1,2	86÷88	Recommended for low-light conditions, cloudiness, mist or fog, seeing as in such conditions, it allows to make objects more visible. Beside perfectly filtering ultraviolet rays (UV) and the blue portion (up to 480 nm) of the visible spectrum, it increases contrast even in low-light conditions. Applications: works in bad weather conditions and in foggy environments, inspection of surfaces, working in tunnels, subsoil working, mines, mechanical working, ultraviolet light exposure, warehouses.
I/O (INDOOR/ OUTDOOR)	2C-1,4 5-1,7	57÷68	Recommended for anyone frequently passing from indoor (closed and with low light) to outdoor environments (open-air and quite enlightened) and vice versa. Being a clear lens with a light mirrored treatment, it provides optimal view in both indoor and outdoor lighting conditions. This lens allows, therefore, a greater visibility and a high identification of colours and shapes during the use in both conditions and during the passage through these two environments. Applications: works with forklift truck, mechanical works, works with the passage between dark and bright environments.
GREY	5-2,5 5-3,1	9÷26	Recommended for well-lighted environments where light causes a considerable eye strain. It greatly absorbs both ultraviolet rays (UV) and infrared ones (IR), beside keeping the relative proportions among colours. The absorption is almost constant in the visible spectrum while the wavelength changes, so that the chromatic perception is only slightly altered. Applications: outdoor works, mechanical works with risk of glare, agriculture, building, refineries.
BROWN	5-3,1	9	Recommended for works in sufficiently lit environments where light can cause eye strain. It protects sufficiently both against ultraviolet (UV) and infrared (IR) rays. Moreover, by filtering discreetly the most energic area of the visible spectrum (blue), it favours the contrast in foggy conditions. It allows a good colour identification with optimum contrast. Applications: outdoor works, mechanical works with risk of glare, agriculture, building, refineries.
MIRRORED (BLUE, RED, SILVER, GOLD)	5-2,5 5-3,1	12÷24	Recommended for environments where it is necessary to be protected against intense sunlight, glare, reverberation and all those elements which cause considerable eye strain. The mirrored treatment on the outer surface of the lens reduces transmittance through a greater reflection of the light hitting the lenses. It is obtained, therefore, a significant reduction of the quantity of light that reaches the eyes, getting a high benefit and a visual comfort even after an extended use. Applications: outdoor works with intense sunlight and with risk of glare, agriculture, building, refineries.
REVO (BLUE, GREEN, SILVER)	5-3,1	9÷14	Recommended for outdoor works with very intense and annoying light condition which disturbs the sight causing eye strain. REVO treatment, done on the external surface of the lens, improves visual performance, protects against ultraviolet (UVA and UVB) and infrared (IR) radiations, grants an excellent abrasion resistance and long-lasting adhesion. Applications: outdoor works with very intense light and with risk of glare, building and construction, waste collection, agriculture, fishing.
POLARIZED (GREY, BROWN)	5-3,1	9÷15	Recommended for intense light and high glow caused by reflective surfaces. Such situations cause a remarkable decrease in eyesight and consequently a considerable eye strain. This type of lens is able to let the light pass selectively; indeed, acting like “Venetian blinds”, they reduce the overall quantity of light passing through and let only the “useful” light pass through. In this way, reverberation is notably reduced and it is increased the quality of images which appear brighter, consequently even the visual perception is improved. Applications: outdoor works with a high risk of glare, construction site, road work, driving vehicles, oil-plants, work on highly reflective surfaces (water, ice, snow, sand and street surface).
WELD 3 WELD 5	3 5	2÷9	Recommended for protection against impacts, ultraviolet rays (UV), infrared rays (IR) and dazzling caused by welding processes. Applications: works in welding and brazing departments (WELD 3: brazing and gas welding; WELD 5: gas and oxyfuel welding, foundries and furnaces).

LENS CURVATURE

A further plus of lenses improving comfort is the curvature (up to base 10). The curvature index defines the difference between more or less wrap-around lenses. Indeed, it results that more wrap-around lenses and so with a greater curvature have a wider and clearer field of view due to a reduction of distortions and aberrations of typical images of less wrap-around lenses and with not high curvature. It results an improvement of visual quality as well as the clarity of peripheral vision of the user.

LENSES TREATMENTS

	ANTI-SCRATCH TREATMENT Hardening treatment carried out on the surfaces of the lenses which determines an improvement in terms of resistance against abrasion and therefore, a longer duration in time.
	ANTI-SCRATCH TREATMENT PLUS Hardening treatment carried out on the surfaces of the lenses which determines an improvement in terms of resistance against abrasion and therefore, a longer duration in time. In conformity with the optional EN 166 requirements, eyepieces with anti-scratch treatment PLUS satisfy resistance parameters to the damage of surface caused by thin particles (whose minimum provided requirement is a luminance factor lower than 5 cd/(m²·lx)), thus offering definitely higher performance compared to the standard anti-scratch treatments on the marketplace. COFRA indicates such performances by specifying the maximum luminance factor (expressed in cd/(m²·lx)) tested by the certification bodies. Therefore, such eyepieces may be marked with the symbol “K”.
	ANTI-FOG TREATMENT Treatment carried out on the surface of lenses which prevents fogging and, being able to spread condensation formed on the surfaces of the lenses in the passage from cold to hot environments, improves the visibility in critical conditions.
	ANTI-FOG TREATMENT PLUS Treatment carried out on the surface of lenses which prevents fogging and, being able to spread condensation formed on the surfaces of the lenses in the passage from cold to hot environments, improves the visibility in critical conditions. In conformity with the optional EN 166 requirements, eyepieces with anti-fog treatment PLUS satisfy resistance parameters against fogging (whose minimum provided requirement is a resistance for at least 8 s), thus offering definitely higher performance compared to the standard anti-fog treatment on the marketplace. COFRA indicates such performances by specifying the minimum time of resistance to fogging (expressed in seconds) tested by the certification bodies. Therefore such eyepieces may be marked with the symbol “N”.
	UV400 PROTECTION UV400 protection extends protection of lenses beyond the conventional block, rated 380 nm. Such treatment, indeed, allows to filter UV radiations beyond this wavelength, blocking the transmittance of the light spectrum up to 400 nm and helping to protect eyes from a wider range of harmful light rays.
	MIRRORED TREATMENT Carried out externally to the lens, covered with a thin partially reflecting layer, it is a treatment that allows a greater reflection of incident light on the lens itself, reducing most of the light that reaches the eyes. This treatment is suitable and recommended for use in conditions of extremely strong light and where it is necessary to be protected against glare (snow and ice).
	REVO TREATMENT Multi-layer coating made on the external surface of lens. It allows to reflect to a high degree that particularly intense and annoying light that disturbs the sight provoking a considerable eye strain. REVO treatment improves visual performance, protects against ultraviolet (UVA and UVB) and infrared (IR) radiations dangerous for eyes, and grants an excellent abrasion resistance and a long-lasting adhesion. This treatment is suitable and recommended for all outdoor activities requiring high visual comfort and protection against sources of intense light.
	HYDROPHOBIC TREATMENT Excellent water-repellent treatment performed on the surface of the lenses through a vacuum process that creates a thin and transparent film. The unique formula used during this process provides exceptional water repellency, making the lenses suitable for all those activities where there is high humidity, such as fishing. It can be applied to simple lenses or on the outer layer of any mirrored or REVO lens.
	HYDROPHOBIC + OLEOPHOBIC TREATMENT Innovative treatment able to combine both water and oil repellence. This treatment acts as an invisible protective film that can protects the surface of the lens. It can be applied to simple lenses or on the outer layer of any mirrored or REVO lens. This treatment provides the lenses with many advantages: water and oil repellence; resistance to stains and fingerprints; easy cleaning; abrasion resistance caused by particles or dust.
	POLARIZING FILTER The polarizing filter is a filter of polarized lenses that reduces eye strain caused by sources of glare and/or glass or reflective surfaces (water, ice, snow, sand, road surface). The result is an increased visual comfort, a higher optical quality and a better contrast of colors, making them more vivid and clear.

FRAME

FRAME FEATURES

	EXTENDIBLE TEMPLES It consists of a system for length regulation of the temples that allows glasses to adapt optimally to the face of the wearer, thus ensuring the best comfort.
	ADJUSTABLE TEMPLES It consists of a system for grade regulation of the temples that allows glasses to adapt optimally to the face of the wearer, thus ensuring the best comfort.
	INTERCHANGEABLE SYSTEM OF TEMPLES/ELASTIC BAND The eye protectors with this system give the possibility to replace the temples with the elastic band and vice versa. In this way, these eye protectors can carry out the function of safety glasses if they are worn with the temples, but at the same time they could be similar to goggles/masks when worn with an elastic band.
	ADJUSTABLE NOSE PAD Soft nose pad equipped with a metal core that allows to adjust and adapt it to any face structure. The result is a comfortable fit for a wide range of nose bridges, avoiding eye strain.
	SOFT NOSE PAD The soft rubber used for the nose pad improves the comfort of glasses, allowing a prolonged use.
	EYEBROW PROTECTION Protection system which, thanks to its softness, makes glasses more comfortable and provides an excellent impactprotection against high-speed particles or against accidental and frontal impacts of the operator.
	SOFT EAR PIECES Situated at the end of temples and made up of soft rubber, they reduce the pressure of the temples on the head of the operator, ensuring a better adherence and a greater comfort especially in case of prolonged use.
	VENTILATION SYSTEM System which, permitting the air to flow, allows to minimize the fogging effect.