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Our glasses are independently tested for compliance with the most rigorous standards available. These are some of the tests used to ensure the pristine optical clarity of our lenses.
Clear focused vision
The Resolving Power Test examines the ability of a lens to form seperate,
distinct images of objects that are close together when viewed from 10.67 m (35 ft) away.
What constitutes a Failure?
The lens fails if there is an inability to distinguish three seperate lines at the 20-line mark on test pattern, both vertically and horizontally.
The Astigmatation Test looks for improper lens curvature or flat areas that cause refractive error and image shifting.
Accurate alignment for the entire field of vision
Clear view with no double vision
The Prismatic Power Test measures the angular deviation of a light ray after it passes through a lens. This is similar to the way light refracts and bends through a prism, causing images to shift.
Although UVA rays are the least intense, they account for more than 90% of UV radiation reaching the earth and remain constant throughout the year. Exposure to high levels of this light without the proper lens filtration may cause damage to all layers of the cornea.
UVB rays are the main cause of sunburn and are strongest in the Summer. Permanent retina or lens damage can result from exposure to high levels of this light without proper lens filtration.
The most harmful type of ultraviolet radiation comes from UVC rays. The ozone layer keeps most of the sun's UVC radiation from reaching earth, but some man-made UV sources, such as welders and cutting torches, emit these hazardous rays. Exposure to high levels of this light without proper eye protection may result in photokeratitis, often referred to as "welder's flash".