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UVA rays (Ultraviolet A) are the longest wavelength of UV radiation, ranging from 315 to 400 nanometers (nm). They make up the vast majority of the UV light that reaches the Earth's surface. UVA rays are characterized by their deep-penetrating ability, meaning they can pass through the cornea and reach the crystalline lens and, in some cases, the retina.
read more about uva rays ...Because UVA rays penetrate so deeply, they are primarily associated with long-term, cumulative damage to the eye. The main structure affected is the lens, which absorbs most UVA light to protect the retina. Over many years, this absorption causes the lens to gradually cloud over, leading to the formation of cataracts. They are also associated with premature aging of the skin around the eyes.
Unlike UVB rays, the intensity of UVA rays does not change significantly with the time of day or the season. They are present with relatively consistent strength all year long, even on cloudy days. They can also pass through un-coated window glass. This makes consistent, daily UV protection essential, whether you are indoors near a sunny window or driving.
The most effective way to block UVA rays is to choose eyewear with a UV400 rating. This certification guarantees that the lens blocks the full UVA range up to 400 nanometers. If you wear contacts, select lenses that include a UV blocker to cover the cornea and internal lens, and pair them with UVA-blocking sunglasses for added protection.
Since UVA rays are an ever-present, silent threat, Lens.com makes sure you can easily access daily protection. We offer a wide range of top-brand contact lenses with UVA-blocking properties. Choosing these lenses helps keep the structures of your eyes clear and healthy for years to come.
Is UVA light used in any medical treatment?
Yes. Low-dose UVA light is sometimes used in phototherapy treatments, such as PUVA therapy, to treat certain skin conditions like psoriasis or vitiligo. However, this is done in a controlled medical setting.
Can sunscreen protect my eyes from UVA rays?
Sunscreen protects the skin around your eyes from UVA damage, but it cannot protect the eye itself. Only physical barriers like UV-blocking sunglasses or contact lenses can protect the cornea and the lens of the eye.
How do UVA rays cause cataracts?
The lens of your eye absorbs UVA energy over your lifetime. This absorption causes proteins in the lens to denature and clump together, which leads to the clouding known as a cataract. Consistent protection slows this process significantly.