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1. www.webmd.com › melanoma-skin-cancer › difference-between-uvaUVA Rays and UVB Rays: What’s the Difference? - WebMD

   www.webmd.com › melanoma-skin-cancer › difference-between-uva

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   2023年7月24日 · UVA and UVB Rays are different types of a form of energy called ultraviolet (UV) radiation commonly seen as sunlight. Both UVA and UVB rays can cause harm to the skin.

2. www.webmd.com › skin-problems-and-treatments › uv-index-overviewThe UV Index Explained - WebMD

   www.webmd.com › skin-problems-and-treatments › uv-index-overview

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   2024年2月12日 · The ultraviolet (UV) index is a number on a scale from 1-11+ that tells you how intense the UV rays from the sun are predicted to be at a particular time and place. It's useful because, while you ...

   • 作者: Evan Starkman

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   What are UVA and UVB rays?

   • UVA and UVB Rays are different types of a form of energy called ultraviolet (UV) radiation commonly seen as sunlight. Both UVA and UVB rays can cause harm to the skin. But there are some health benefits available from UVA and UVB rays. Making sure you protect your skin can help you lessen the risks of harmful exposure to both types of rays.

   UVA Rays and UVB Rays: What’s the Difference? - WebMD

   www.webmd.com/melanoma-skin-cancer/difference-between-uva-rays-and-uvb-rays

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   Can UV light cause cancer?

   • UV light interferes with the base pairs that make up your DNA. This leads to mutations that could cause cancer. Squamous cell carcinomas are an example of a type of cancer that can invade your eye. Eventually, this type of cancer can lead to the surgical removal of your entire eye.

   What Are Photochromic Lenses? - WebMD

   www.webmd.com/eye-health/what-are-photochromic-lenses

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   How does the UV model work?

   • The UV model also considers the angle of the sunlight based on latitude, day of the year, and time. The calculation also considers UV strength, which depends on wavelengths. Shorter wavelengths are more damaging than longer ones. The calculation then adjusts for elevation. That's because UV gets more intense the higher you are above sea level.

   The UV Index Explained - WebMD

   www.webmd.com/skin-problems-and-treatments/uv-index-overview

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4. www.webmd.com › skin-problems-and-treatments › eczemaPhototherapy for Atopic Dermatitis - WebMD

   www.webmd.com › skin-problems-and-treatments › eczema

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   2024年3月6日 · Phototherapy, also called light therapy, is a treatment that uses ultraviolet light from a medical device to relieve certain skin conditions. It can ease itching, redness, and swelling in some...

5. www.webmd.com › a-to-z-guides › ssBenefits of Light Therapy - WebMD

   www.webmd.com › a-to-z-guides › ss

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   2023年10月17日 · 2 /12. Light therapy can treat plaque, palmoplantar, nail, and scalp psoriasis. The nbUVB light from a light box, other light source, or a laser helps slow the growth of skin cells, calm an ...

6. www.webmd.com › skin-problems-and-treatments › psoriasisPhototherapy for Psoriasis Treatment: Types, Purpose, Risks ...

   www.webmd.com › skin-problems-and-treatments › psoriasis

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   If the medicine you put on your skin isn't doing all that it needs to, your doctor may suggest adding phototherapy to your psoriasis treatment. It uses ultraviolet rays that come from sunshine, artificial lamps, or lasers to slow skin cell growth and ease your symptoms. Sunlight. Too many rays coming directly from the sun can make your symptoms wor...

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   UVB (ultraviolet B). Your doctor can treat you with UVB rays from a phototherapy machine in his office. You can also get one to use at home. But the lamps can give off ultraviolet A (UVA) rays. These are the ultraviolet rays linked to skin cancer. Talk to your doctor about how to protect yourself from the cancer risk while being treated.

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   PUVA clears up psoriasis quickly with long-lasting results. But using it for a long time can raise your chances of skin cancer. Because of that, its typically only recommended for severe cases or when other treatments haven't worked.

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7. www.webmd.com › eye-health › corneal-flash-burnsCorneal Flash Burns - Welder's Eye - Photokeratosis

   www.webmd.com › eye-health › corneal-flash-burns

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   2022年11月2日 · A corneal flash burn can be caused by exposure to ultraviolet radiation from the sun, a welder's arc - even a halogen desk lamp. WebMD tells you how to protect your eyes from injury.

8. www.webmd.com › eye-health › what-are-photochromic-lensesWhat Are Photochromic Lenses? - WebMD

   www.webmd.com › eye-health › what-are-photochromic-lenses

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   2022年6月27日 · 5 min read. Photochromic lenses are one of your options when selecting eyeglasses. They’re the type of lens that transitions to a darker color when exposed to the sun or other sources of UV ...