Technical specifications – Pilot eyewear
Material of the frame is Grilamid (TR90). This material can resist both low and high temperatures without changing is form and it also contains a memory of it’s original form regardless of how it is bended. Do not try to heat the material to change it’s form, it will not work. At som stage the material will just melt if heated too much. The frame comes with life-time warranty!
The material Grilamid is a Swiss patent and the configuration makes it ideal for the purpose of a sunglass frame, light weight and next to indestructible. The frame has several other features:
- The frame is ventilated in the upper part to allow air to circulate on the inside of the sun-lens, mainly to prevent fogging of the lenses.
- The end pieces covered with rubber is adjustable to a different permanent position. Just bend the part covered with rubber to your ideal position and it stays there.
- The rubber can be removed if you feel it will be more comfortable using headsets, it will only be a very thin part holding the frame in position.
- The frame is tested according to common safety standards. The frame will not break and create splinters. The frame is tested according to Amercian standard ANSI Z87.1+ (2010) and European standard EN166F. The certification is printed on the inside of the left temple and please let us know if you require a copy of the certification documents.
All our lenses are made of polycarbonate and they are moulded to high specification with a thickness of 2 mm.
When a pilot fly at high altitudes, his or her eyes may be exposed to higher levels of ultraviolet (UV) radiation. Exposure to UV radiation can lead to the development of cataracts and other serious eye problems. In addition, glare from the sun can make it difficult for an aviator to maintain positive situational awareness of his or her surroundings.
Pilotsunread have take this to new heights by adding a blue blocking filter called “Blue Ray” which increase the level of harmfull ray blocking up to 420 nanometer wavelength. Visible light start at about 380 nanometer but in the transition area between ultra violett and visible light, the area just in the beginning of the visible light is very intense dark blue and contain high energy affecting us in many ways.
- Aspheric design – Conventional lenses have a front surface that is spherical, meaning it has the same curve across its entire surface. Aspheric lenses have a more complex front surface that gradually changes in curvature from the center of the lens out to the edge. Aspheric lenses provide correction for small distortions in vision. As a side benefit, they are also typically thinner and lighter than some other lenses.
- Polycarbonate lenses are resilient, impact-resistant and a very suitable among active individuals. The durability of polycarbonate lenses makes them a good choice for rimless eyeglasses. Plus, polycarbonate lenses have built-in 100% UV filters to help prevent eye problems such as macular degeneration (breakdown of macula) and cataracts (clouding of the eye lens).
- Scratch protection – Nothing will make your lenses scratch-proof, but a scratch-resistant coating has been applied on all our lenses helping prevent scratches from damaging your lenses (and interfering with your vision). Scratch-resistant lenses can minimise every day wear and tear and help you protect your investment in quality lenses.
- UV protection. The ultraviolet light can be dangerous to your eyes if exposed for prolonged time. burns and other effects can cause permanent damage to your retina and other parts of your eyes. It is very important that you sunglasses have a total protection against all rays up-to 400 nanometer wavelength (420 nanometer with added Blue Ray filter).
Because short-wavelength, high energy blue light scatters more easily than other visible light, it is not as easily focused. When you’re looking at computer screens and other digital devices that emits significant amounts of blue light, this unfocused visual “noise” reduces contrast and can contribute to digital eye strain.
The short-wavelength, high-energy light rays on the blue end of the visible light spectrum scatters more easily than other visible light rays when they strike air and water molecules in the atmosphere. The higher degree of scattering of these rays is what makes a cloudless sky look blue.
Research has shown that lenses that block blue light with wavelengths less than 450 nm (blue-violet light) increase contrast significantly.
American Standard Institute (ANSI Z87.1+ 2010)
This safety standard is the most common and controls testing of safety aspects for sunglasses. This standard is for occupational health and very rigorous with high demands to live up to specific criteria when tested by independent certification authorities.
High Mass and High Velocity Impact forces to be tested:
The high mass pointed projectile is pointed and weighs 500 grams and is dropped from a height of 50 inches. The high velocity test uses a steel ball .25 inches (6,35 mm) in diameter that is fired at 150 feet per second (45 m/s) at the lens in the test frame.
Sunglass filter categories
Visible Light Transmission (VLT) – This is the measure of how much light your sunglass lens lets through to your eye and can be expressed as a percentage, therefore a VLT of 1% means very dark glasses indeed, and a VLT of 100% means all the light is getting through and the lens is therefore a ‘clear lens’.
Rather than quote a percentage for each lens they are categorised as follows:
- Category 0; 80-100% VLT
- Category 1; 46-79% VLT
- Category 2; 18-45% VLT
- Category 3; 8-17% VLT
- Category 4; 3-8% VLT
Bifocal lenses which is a lens where a part of the lens is optical enhanced with a power added helping persons having presbyopia or where a pair of reading glasses helps to read smaller prints at close distance. The difference between normal bifocals and Pilotsunread bifocal lenses is the shape and clarity of the bifocal area which is is carefully placed with a height of only 14 mm from the lower part of the lens. The transition between the reading area and the rest of the lens must be very sharp not to create distortion in the transition area. For most people, this will not disturb the normal vision but allowing looking through the bifocal part by means of just looking down a bit. It will be fully automatic after a short moment and become part of a normal eyesight where focus is needed on items closer to the eye.
Presbyopia is a natural part of the ageing process. It is due to hardening of the lens of the eye causing the eye to focus light behind rather than on the retina when looking at close objects. It is a type of refractive error along with nearsightedness, farsightedness, and astigmatism. It is for most people age related where it normally starts around the age of 40 and stabilises at the age of 60. The power is always positive, that is the addition needed to magnify for reading close to the eye. Pilotsunread bifocal powers comes in diopters: +1,00 +1,50 +2,00 +2,50