- Lens materials
- Lens tints
- Visual distortion
- Lens shape
‘Multiple lens options’
AMO's sports sunglasses come with a superb polycarbonate lens as standard but also offer a choice of high performance lenses across its range of Typhoon, Thunderstorm and Transformer series.All can be swapped for or upgraded for alternatives during the shopping process.
|Polycarbonate lenses have superb optical clarity, measuring a crisp and clear at the 28 line on the NBS definition pattern testing index and have low optical distortion, even towards the outer edges. They are strong, lightweight, impact resistant, scratch resistant and contain a water repelling coating creating a hydrophobic surface. Polycarbonate lenses come with different tints for different light levels. The Revo colours add an intense, dramatic coloured effect.|
NXT® lenses are made from Trivex®, a proprietary rival material to polycarbonate. NXT® lenses have outstanding optical clarity, having an NBS number of 45 (a measure of the optical transparency of material) compared with the polycarbonate lenses which have an NBS number of 28. This means NXT® lenses have less optical distortion than polycarbonate particularly towards the outer edges. NXT® lenses are exceptionally strong, lightweight, offer outstanding impact resistance, are scratch resistant and have a water repelling hydrophobic surface. NXT® lenses come with different tints for different light levels with photochromic light sensitive versions, a polarised version and Revo coloured versions.
About polarized lenses
The debate continues about polarized sport sunglasses lenses and whether they are beneficial for the multi-sport athlete. The public perception is that polarization offers advantages: polarized lenses do reduce glare and eye fatigue in very sunny environments and where there is a lot of reflected light (water, snow). But there are issues for the multi-sports athlete: poor polarization does reduce optical clarity and most polarized lenses will make it harder to read the LED displays on a bike computer or sports watch and poorer quality polarized lenses will actually distort vision.
AMO's sports sunglass models provide a polarized lens option, taking special care to ensure there is no compromise in optical clarity from its polarization. AMO also offers a revolutionary Photochromic and Polarized NXT lens: one of the best lenses on the market.
About photochromic lenses
If you choose AMO's sports sunglasses with the NXT photochromic lens, you'll have self-tint-adjusting technology: the most advanced sports sunglass lens available.
This type of lens is created by infusing small amounts of silver halide crystals into the glass lens material during manufacture. These microscopic crystals automatically change orientation in response to UV light which results in a shift in tint, either increasing or decreasing visible light transmission, resulting in a fine-tuning of the of the lens tint in response to ambient light conditions as they change throughout the day.
Using an NXT lens base, the photochromic capability never wears out and should last the life of the your sports sunglasses. AMO's sports sunglasses offer multi-sport athletes a lens with crisp optics and soothing light levels, so you can focus on the race from dawn to dusk.
About Revo lenses
Revo lenses have a dramatic, intense coloured effect - a coloured coating added during the manufacturing process. There is no real performance advantage from Revo coatings apart from the fact they may reduce the light transmission by around 3 to 5% and they are purely for aesthetic purposes. They look simply stunning! The Revo coating is slightly more susceptible to scratching than AMO's other lenses.
About lens tints
AMO's sports sunglasses are available in a wide variety of lens tints such as polarized, photochromic, dark, medium dark, low light and mirrored to enhance vision in all light and weather conditions. All AMO lenses provide 100% UV protection.
The lens tint describes the luminous transmittance of the lens and it is generally one of five categories. Each AMO lens has a tint category listed.
- Category 4 = 100% to 80% transmittance. These are used in very extreme conditions and are too dark from most multi-sport situations. These types of lenses are often used in safety glasses such as in welding.
- Category 3 = 80% to 43% transmittance. These are quite dark and unless the conditions are very bright are too dark for most multi-sport situations. Theses types of lenses can be used in places where there is a lot of light such as in the snow, desert or on water.
- Category 2 = 43% to 18% transmittance. These are dark lenses, suitable for multi-sports on bright days. If your eyes are sensitive or you do not want any squinting then these can be suitable for multi-sport situations.
- Category 1 = 18% to 8% transmittance. These are quite light lenses and are suitable for multi-sports on most days and overcast or cloudy days. They are suitable for multi-sport situations.
- Category 0 = 8% to 3% transmittance. These are very light lenses and are too light and not really suitable for multi-sport situations.
AMO sunglasses are within categories 2 and 3. AMO also tests it lenses to ensure the luminous transmittance between the left and right eye lenses is the same - reducing eye fatigue.
About lens colour
We believe there is a lot of 'pseudoscience' and marketing hype about the best lens colour for the best light conditions. Apart from 'yellow' lenses for low light conditions which improve contrast in low lighting conditions, we believe a coloured lens is primarily an aesthetic preference for most people and are not applicable for sports such as triathlon, trail running, ultra-running, marathon running, cycling and mountain-biking .
All AMO sunglass base lenses are either brown or smoke coloured with a mirror finish: the optimum colours for multi-sports sunglasses. The outer surface can be treated in a wide variety of colours. Revo coloured coatings and the polarised, photochromic and low-light lens versions offer increased aethetic choice:
One of the most important features of AMO sports sunglasses, which stands out from the competition, is their clarity of view, lack of haze and lack of visual distortion. When light hits an aggressively-curved lens it causes it to bend or distort an object's true size or position. AMO uses specially designed lens technology to correct the distortion by progressively tapering the lens from the optical center towards the outer edges. Light waves are delivered straight to your eye resulting in zero distortion and a reduction in eye fatigue.
Clarity and distortion
There is a lot of 'pseudoscience' and marketing hype written about the comparative clarity and distortion of lenses with no real scientific quantitative and statistical comparative testing. AMO has tested its sports sunglasses for clarity and distortion using a NBS definition pattern testing index where all AMO lenses exceed 28 [Rob – this is the test i mean but we should not use this link see link and against other sports sunglasses brands, the results show that AMO's sports sunglasses offer the highest levels of clarity available for sports sunglasses.
Haze is the fogging or cloudiness of the lenses caused by imperfections in the base lens materials or imperfections introduced during the manufacturing process. When you look through another material, there is always going to be some level of haze. At AMO we have chosen only the very highest quality lens materials from the best manufacturers to ensure the least amount of haze possible.
A larger lens provides better sun protection as it wraps around the face reducing light entering from the sides. Larger lenses are recommended for people with sensitive eyes and in very sunny environments. If safety is a #1 priority, a larger lens will provide greater protection, passing stricter safety standards. Naturally, the larger the lens the greater the eye protection.
AMO sport sunglasses lenses also have ventilation holes in the lenses allowing the lens and air temperature to equalise quickly to reduce fogging.
The AMO sports sunglasses range includes a variety of different lens shapes: Typhoon, Thunderstorm and Transformer. All offer good protection and are lightweight and strong:
Typhoon series lenses, held by an ultra lightweight frame, are suited best to marathon runners, triathletes and cyclists;
Thunderstorm series lenses, with their greater wrap-around shape held by a larger frame, are best suited to mountain bikers, cyclists, trail runners and triathletes.
Transformer series lenses offer good all-round performance for multi-sports athletes and are suitable for marathon runners, triathletes, cyclists, mountain bikers and trail runners.