Boat sunglasses

SUN PROTECTION INDEXES

There are different sun protection indices for spectacle lenses, ranging from 0 to 4, corresponding to different levels of protection against the sun's rays. 

• Category 0: these lenses filter virtually no light, from 0 to 19% of rays. These are generally glasses for aesthetic comfort.
• Category 1: these lenses are lightly tinted, filtering out a small proportion of the sun's rays (between 20% and 57%). 
• Category 2: sunglasses with a protection factor of 2 are those used in moderate sunlight situations. They filter out 57% to 82% of the sun's rays. 
• Category 3: this category 3 offers excellent sun protection for most activities, with a filtration percentage of 82% to 92%.
• Category 4: the highest protection category, these lenses filter out up to 97% of light. They should be used in extreme sunlight conditions, and should not be used while driving, as they alter vision and color perception.

WHICH LENS COLORS TO CHOOSE FOR YOUR PRACTICE? 

Each lens color will have its own specificities, depending on your practice and the light conditions. 

Red glass: the perfect color for highlighting contrasts in moderate light.

Grey glass: the color that provides the best protection from the sun, especially from reflections on the water, with minimal eye strain and realistic color perception. It's the perfect color for sight fishing in sunny regions.

Blue glass: a color that provides sharp contrast below the water's surface and perfect protection from glare and UV rays, it's the preferred color of offshore fishermen or yachtsmen on their sailboats.

Yellow glass: ideal for overcast or low-light conditions, as it improves vision.

DIFFERENCES BETWEEN UVA, UVB AND UVC 

• UVA rays are ultraviolet rays with the longest wavelength (320 to 400 nm), close to visible light. They have little energy, but penetrate deep into the skin. They cause tanning, but also skin aging, theappearance of spots and the development of cancer.
• UVBs are more energetic and shorter (280 to 320 nm) than UVAs. They don 't penetrate much of the skin, but they are very harmful. They cause burns, inflammation, allergies and skin cancer. They account for around 5% of UV ra ys reaching the earth. 
• UVCs are the shortest (190 to 280 nm) and most powerful of all UV rays. They are very dangerous for living beings, as they can modify their DNA. They are almost totally blocked by theearth's atmosphere, in particular by the ozone layer, and do not reach us. They are used for their ability to kill germs in hospitals and laboratories.