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Lens Technology

"We want the best protection for our customers' eyes."

Altitude developed the SKYLAB glasses line with optical quality and protection foremost in mind.




High-end glasses:


We offer a wide selection of lenses ranging from SKYLAB polycarbonate UV 400 lenses to polarized and photochromic lenses.
Treatments and materials applied to our lenses: Polycarbonate and polyamide treatments raise Altitude frames to meet your highest requirements.

Quality of materials used:

We use POLYCARBONATE and POLYAMIDE materials for our Sports products due to their lightness and exceptional impact resistance.


Polarized lenses, as well as photochromic and internally-treated anti-glare lenses complete our obsessive quest for quality and performance in the Skylab line, which is designed to adapt to field situations and protect your eyes from harmful radiation.










Choose sunglasses using our convenient tags:
In our store, our products are equipped with electrostatic tags to assist you in choosing your Altitude sunglasses depending on the particularities of each glass.

Here are the different tags used:




The multilayer lenses are free of electrostatic lens tags.




Filter/category indexes:

Category 0: Very clear; almost totally colorless, these sunglasses filter from 0% to 19% of sunlight. This category does not protect against light radiation and sunglasses are used mainly as protective goggles or to guard against drafts.

Category 1: These are slightly tinted sunglass lenses and have a filtration capacity of between 20% and 57% of sunlight. While it is not advisable to use these sunglasses in prolonged sunlight, given their base color they nevertheless provide useful filters which improve readability relief when viewing objects with yellow or orange bases.

Category 2: These sunglasses provide basic protection by filtering 58% to 82% of radiation and can be used in mid-season in weak sunlight.

Category 3: With a proportion of filtered light from 83% to 92%, these sunglasses constitute serious protection against radiation and are adapted to many contexts of use. Combined with polarizing and anti-glare features, they represent the standard quality of SKYLAB's line.

Category 4: These sunglasses filter out a large amount of light, from 93% to 97% of light rays. They constitute the best protection in the event of extreme sunshine, as in snow, where reflections amplify the harmful effects of light on the eye.
However, they are inappropriate for driving because they can distort the perception of traffic signals and signs.

Category 2-3: Altitude Eyewear recommends SKYLAB PHOTO glass, “smart” PHOTOCHROMIC glass which, through the internal properties of the material, can adapt to ambient light within seconds, in passing from category 2 with its benefits in terms of contrast enhancement, to category 3, which offers maximum protection. SKYLAB PHOTO is particularly suitable for cycling or running, activities in which the athlete quickly passes from shaded areas to brightly lit areas.




Light absorption:
The light passing through a sunglass lens is subjected to a reduction of intensity due to internal and surface properties of the material.
The proportion of absorbed light between the outer face and the inner face of the glass is a subtraction of the luminous flux that can be measured as a percentage. By combining the amount of reflected light with this percentage, one defines the category of glass protection.
Let φi (total incidental luminous flux) be a glass, the nature of materials used be defined as φa (absorbed flux), and the quality of the surface be defined as φr (flux reflected by the two surfaces), so that the filtered light perceived by the eye will be φ = φi - φr - φa.

Each sunglass in SKYLAB's line has been calibrated so that the flux φ is most suited to the purpose of our frames.



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