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5 Important Reasons To Protect Your Eyes From The Sun’s UV Radiation

A Pterygium

Dermatologists have done a great job promoting sun safety. We all know that we should use sunscreen or sunblock to avoid burns, and to reapply it religiously when we plan to be outdoors for long periods of time. But how often do we think about protecting our eyes from the same UV rays?

A dear friend of mine has been on a long-term medicine that makes her skin especially sun-sensitive. She did not take sufficient precautions to protect her eyes from UV radiation (though she always wore sunscreen on her skin), and she developed a pterygium that looks just like the photograph above. Her condition reminded me of the importance of eye protection, and I thought I’d offer you 5 excellent reasons to start shielding your eyes from the sun. UV protection is critical for avoiding:

1. Photokeratitis. Photokeratitis is essentially a sunburn of the front layer (cornea) of your eyeball. If you’ve ever had a burning sensation in your eyes after a long day at the beach, or in the snow, you may have burned your eyes. Just as skin sunburns are painful and take a few days to calm down, eye pain can be very uncomfortable. But worse than the temporary discomfort is the increased long-term risks of pterygia, cataracts, and other eye conditions (see below).

2. Pterygia. Pterygia are overgrowths of corneal tissue that can grow across the iris and pupil. They can be cosmetically unsightly, and can block vision if they grow large. They are caused almost exclusively by UV damage, and are most common in people who live near the equator (because their exposure to UV radiation is highest). Surgery is the only known treatment for pterygia, though as many as 50% grow back, and surgical divets in the cornea can cause visual problems.

3. Cataracts. Cataracts are opacities of the eye lenses that lead to partial or total blindness. The exact mechanism by which they occur is unclear, though we know that sun exposure contributes to their development. Cataracts are the number one cause of blindness in the world.

4. Skin Cancers. Basal cell carcinoma (BCC) is a type of skin cancer that primarily develops on skin that has been sunburned, especially in childhood. Melanoma is a deadly form of skin cancer that is much rarer than BCC, but also most commonly develops on skin that has been burned. Squamous cell carcinoma (SCC) is the least invasive type of skin cancer, and usually develops on skin that has had the largest total amount of sun exposure over a lifetime. People who don’t protect the thin eye skin and lids from UV radiation (beginning in childhood) are more likely to develop cancer around the eyes

5. Macular Degeneration. Exposure to the sun’s UV rays can cause damage to the deep structures of the eye, including the retina. Light focused on the macula (the most important part of the retina for vision) can cause damage in the area over time. Macular degeneration results in visual damage and even blindness.

Ok, so I hope I’ve convinced you that UV protection is critically important for your eyes… How can you protect yourself? There are 4 primary strategies:

1. Wear UV protective sunglasses. When buying sunglasses, check out their product labels and avoid glasses that are purely cosmetic – opt for those that block 99-100% of UV A and B rays. Larger glasses and wrap-arounds offer the most coverage. Remember that kids need sunglasses too!

2. Wear a wide-brimmed hat. Although a hat doesn’t always protect you from glare and light reflection from other surfaces, it can reduce the total amount of radiation that reaches your eyes and skin.

3. Wear UV-protective contact lenses. Most people don’t realize that some contact lenses are manufactured with a UV protective layer already built in. Although they are not large enough to protect the entire eye surface (or the skin around the eye) they offer an added layer of protection against harmful UV rays. However, not all contact lenses offer UV protection, and of those that do, not all provide similar absorption levels. An eye care professional can prescribe Class 1 UV-blocking contact lenses, which provide the greatest level of UV protection and which have a Seal of Acceptance for UV Absorbing Contact Lenses from both the American Optometric Association and the World Council of Optometry’s Commissions on Ophthalmic Standards. These lenses block more than 90 percent of UVA rays and 99 percent of UVB rays.

4. Protect your eyes all day. UV radiation for the eyes is actually worse when the sun is lower in the sky. Researchers at the Kanazawa Medical University in Japan found that during early morning and late afternoon, UV exposure to the eyes was about double that of the hours around noon during Spring, Summer and Fall.

For more information about protecting your eyes from the sun, you may enjoy listening to my recent interview with Dr. Stephen Cohen.* He is an optometrist who lives in Arizona – and is therefore well acquainted with UV radiation! Scroll down to the bottom of the page after clicking on the link and you’ll see the podcast.

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Note that I was paid by Johnson & Johnson Vision Care, Inc. to host the radio show with Dr. Cohen.

Superfocus Glasses May Improve Vision In The E.R.

A man wearing superfocus glasses.

As I write this post, I’m wearing my new Superfocus glasses. I was given the glasses by the company to demonstrate, and they are nothing less than remarkable. I’ve used them mostly in two very common settings for me—indoors and outdoors. In both situations, they performed very well.

Superfocus lenses work by mimicking a young, healthy human eye. Each lens is actually a set of two lenses (flexible and firm). The flexible, inner lens has a transparent membrane attached to a rigid surface, sandwiching a small amount of clear fluid. The bridge (across the nose) connecting the lenses allows you to adjust the shape of the flexible lens. Slide the tab along the bridge to find the exact correction for the particular user. The intent is to achieve clear, undistorted vision within any lighting or distance.

You can learn a great deal from the Superfocus website about the benefits of adjustable lenses, how to obtain the glasses, and so forth. I won’t reiterate information from the website, but rather discuss how I have used these glasses and discuss their performance based on my own experience.

First, I used them during my work in the E.R. as a physician. Read more »

This post, Superfocus Glasses May Improve Vision In The E.R., was originally published on Healthine.com by Paul Auerbach, M.D..

Accidental Corneal Tear From Hugging A Baby

So on Sunday night, I finished singing BSparl her bedtime song and leaned in to tuck her into her crib.  But because she was giggling and reaching for me, I leaned in to give her an extra hug.

NEVER GO IN FOR THE EXTRA HUG.

Or at least that’s what someone should have whispered in my ear.

Because when I leaned it, she happened to reach up at the same time and her thumb met my eye with such force that it knocked me to my knees.  Apparently, her thumb nail scraped off a section of my cornea (or, as my eye doctor said, “You know when you eat string cheese and you pull a section of the cheese off?”  Thanks, Dr. S.  I will never, ever eat string cheese again.  Ever.) and severely damaged my eye. Read more »

*This blog post was originally published at Six Until Me.*

Vision Development: The Impact Of 3-D Video Games On Kids’ Eyes

nintendo3ds Nintendo Warns on 3 D Games for ChildrenLast week, Nintendo became the latest consumer electronics maker to warn that kids shouldn’t use their three-dimensional image-based gaming devices because they may have a negative impact on development of the human visual system.

The warning came just a month before the company’s much anticipated release of the 3DS, which is just such a device that features a 3.5-inch screen which can create 3-D images without the need for special glasses. The 3DS is Nintendo’s most anticipated new product since it released the iconic Wii gaming device in 2006.

Sony’s PlayStation3, a similar product that requires glasses to create the 3-D effect, already carries a similar warning, as do 3-D TV sets made by Sony, Samsung, and Panasonic.

Nintendo’s warning applies to kids that are six years old or younger. The Japanese company advised parents to block access to the game machine’s 3-D mode for these kids, while adding that it was okay for them to use the 3DS in 2-D mode. Read more »

*This blog post was originally published at Pizaazz*

Glaucoma Testing Through The Eyelid

f34gdfg.jpgIntraocular pressure is usually measured by applying a force on the cornea using a tonometer. Although sufficiently accurate, tonometers are only used in ophthalmologist offices and so don’t measure intra-day pressures. They also fail with people post cataract surgery that have a thicker cornea. Researchers at University of Arizona have developed a new device that measures intraocular pressure through the eyelid.

From the University of Arizona College of Engineering:

The self-test instrument has been designed in Eniko Enikov’s lab at the UA College of Engineering. Gone are the eye drops and need for a sterilized sensor. In their place is an easy-to-use probe that gently rubs the eyelid and can be used at home.

“You simply close your eye and rub the eyelid like you might casually rub your eye,” said Enikov, a professor of aerospace and mechanical engineering. “The instrument detects the stiffness and, therefore, infers the intraocular pressure.” Enikov also heads the Advanced Micro and Nanosystems Laboratory.

While the probe is simple to use, the technology behind it is complex, involving a system of micro-force sensors, specially designed microchips, and math-based procedures programmed into its memory.

Link: New Glaucoma Test Allows Earlier, More Accurate Detection…

*This blog post was originally published at Medgadget*

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