The newest material used for the realization of our sports frames is the Nylon TR90LX, stress-resistant and impact-resistant, extremely light. These characteristics are due to the chemical composition of this material unique in its kind, 70% Nylon 30% Carbon. It is 20% lighter than conventional nylons and offers greater resistance to shock and traction. It offers a greater resistance to high temperatures without deformation and, in addition, has a shape memory, which means it can be folded, but will always return to its original shape. Due to its flexibility and strength the TR90LX is the safest material for sportive use in optical, in fact, the resistance of the head frame of accidental collisions has demonstrated a strong structural integrity. This special material also ensures an exponential increase of the frame duration in the time.
The polycarbonate is the most used material in sports optical industries. It offers a high resistance in impacts although it is extremely light.
Grilamid® is a special nylon studied for frames used in sport activities. It offers extreme strength although it is light and flexible adapting itself perfectly to the face. It has a "memory" which keeps its shape and elasticity even in extreme temperatures.
The spring hinges are projected under high standards and give the right amount of tension on the temples for a secure and comfortable adhesion. Available on most metal frames.
The side arms of the frames and the nose pads absorb humidity, always giving a perfect adhesion and a comfortable feeling.
These nose pads can be personalised to adapt perfectly to your nose, keeping the frame well fixed in place. Available on many items.
Prescription Sport Sunglasses
RX OPTICAL ADAPTERS
Transform selected Bertoni sunglasses into prescription with optical clips for prescription lenses without any limitation of gradation.
PHOTOCHROMIC ANTIFOG LENSES
Photochromic lenses tend to darken or lighten automatically with increasing and decreasing exposure to UV rays, always guaranteeing excellent visual performance. Photochromic lenses protect your eyes every day, in the presence of sun, overcast skies or in intermediate weather conditions. The lenses themselves are anti-fog, treated with a special resin able to disperse the condensation that forms on the surfaces of the lenses in the transition from hot to cold. The reaction times of photochromic lenses are very fast: only 8 seconds to go from light to dark, and 35 seconds from dark to light.
PHOTOCHROMIC POLARIZED LENSES
Polarized photochromic lenses combine the versatility of traditional photochromic lenses, which adapt to changes in light, with the anti-glare characteristic of polarized lenses. Their ability to darken ranges from filter 1 or 2 (brown or light gray) to filter 3 (brown or dark gray).
Many surfaces reflect the sun’s rays just like a mirror (so do windows, water surfaces and snow), amplifying the intensity. It is necessary in these conditions to protect your eyes against this glare. The polarized lenses cut out the excess light. The vertical light brings information to the eye, making it possible to see colours and contrast, while the horizontal light is the one with which we see glare. The polarized eyewear block out the horizontal light, acting like a filter and making our eyes absorb only the best light. Plus, the polarized lens technology intensifies the contrasts improving the perception of colours, this is great for watersport sunglasses.
YELLOW LENSES - NIGHT DRIVE
The yellow lens is ideal for night driving, it is suitable in low light, fog, mist and rain. This lens allows clear vision during dark night or rainy and foggy day.
STANDARDS AND CERTIFICATIONS
ANSI Z87.1 is an important norm for the eye protection industry in the USA. This standard covers different types of eyewear: spectacles, goggles and face shields as well as prescription and plano lenses. ANSI Z87.1 gives general descriptions and requirements to the eyewear and provides the test methods. The general requirements to the eyewear include the optical quality, luminous transmittance, refractive powers and haze for clear lenses. The general physical requirements are no sharp edges and no other defects that may cause discomfort or injury. The minimum coverage area is also checked to make sure that eyewear doesn’t restrict the view field of the user. The ”drop ball test” is applicable only in case of no high mass impact and velocity tests are done. The eyewear has to endure also the ignition and corrosion (if there are any metal parts) tests. Eyewear shall provide a good and tight lateral coverage of the eye. The high mass and high velocity tests are passed if no part of the eyewear becomes detached from the inner surface, if there is no fracture, no complete penetration of the projectile through lens or frame, no rupture of the lens. ANSI Z87.1 lays down also the requirements to the optical radiation protection. Among the common industrial filters like infrared and visible light protection (for welding), the standard lays down the criteria for protection against ultraviolet radiation. While the first two are not needed in the ballistic glasses, the latter is very important. All Bertoni tactical lenses hence offer a complete UV protection up to 400 nm.
DIN EN 166
DIN EN 166 is an European norm which defines the personal eye protection requirements. This norm uses the common procedures of EN 167, EN 168 and EN 170.
EN 167 defines the optic requirements for the protective eyewear: spherical, astigmatic and prismatic power. The results of the test of the above mentioned refractive powers are classified into three categories. The optical class 1 is the highest one and allows eyewear to be used permanently. This test method also checks the light transmission (light filtering) as well as light diffusion and quality of material and surface.
EN 168 determines non-optic tests like the test on increased robustness, stability at elevated temperatures, UV resistance and resistance to ignition, high speed impact, resistance to fogging and protection against gases, dust, and smoke. According to EN 166, glasses may be tested with high speed particles with low energy impact only (marked as F, energy of about 0,87 J) while goggles may have the medium energy impact (B, ca. 6,19 J) and full-face shields are the only ones allowed the test with high energy impact (A, ca. 15,52 J).
EN 170 tests the protection of the object against ultraviolet radiation. The marking on the lenses like 2C-1.2 for clear and yellow lenses and 5-3.1 for smoke are defined by the result of this test, where the kind of filter is shown in the part before the hyphen and the shading is the part after the hyphen. All tactical lenses offer the UV protection up to 400 nm.