The Eyes Have It Pdf

[Cyrille Mixtapes]

Witha foreword by former UN Special Rapporteur E. Tendayi Achiume, The Walls Have Eyes reveals the profound human stakes of the sharpening of borders around the globe, foregrounding the stories of people on the move and the daring forms of resistance that have emerged against the hubris and cruelty of those seeking to use technology to turn human beings into problems to be solved.

Dry eye disease is a common condition that occurs when your tears aren't able to provide adequate lubrication for your eyes. Tears can be inadequate and unstable for many reasons. For example, dry eyes may occur if you don't produce enough tears or if you produce poor-quality tears. This tear instability leads to inflammation and damage of the eye's surface.

Dry eyes feel uncomfortable. If you have dry eyes, your eyes may sting or burn. You may experience dry eyes in certain situations, such as on an airplane, in an air-conditioned room, while riding a bike or after looking at a computer screen for a few hours.

Treatments for dry eyes may make you more comfortable. These treatments can include lifestyle changes and eye drops. You'll likely need to take these measures indefinitely to control the symptoms of dry eyes.

See your health care provider if you've had prolonged signs and symptoms of dry eyes, including red, irritated, tired or painful eyes. Your provider can take steps to determine what's bothering your eyes or refer you to a specialist.

Dry eyes are caused by a variety of reasons that disrupt the healthy tear film. Your tear film has three layers: fatty oils, aqueous fluid and mucus. This combination usually keeps the surface of your eyes lubricated, smooth and clear. Problems with any of these layers can cause dry eyes.

Reasons for tear film dysfunction are many, including hormone changes, autoimmune disease, inflamed eyelid glands or allergic eye disease. For some people, the cause of dry eyes is decreased tear production or increased tear evaporation.

Dry eyes can occur when you're unable to produce enough liquid tears, also called aqueous fluid. The medical term for this condition is keratoconjunctivitis sicca (ker-uh-toe-kun-junk-tih-VY-tis SIK-uh). Common causes of decreased tear production include:

If you experience dry eyes, pay attention to the situations that are most likely to cause your symptoms. Then find ways to avoid those situations in order to prevent your dry eyes symptoms. For instance:

A picture of the human optic nerve chiasm and associated optic nerve sheath that covers it. Purple highlights the optic nerve tissue and the white vasculature surrounding it highlights the lymphatic vasculature in the optic nerve sheath surrounding the chiasm. (Special thanks to Dr. Anita Huttner for helping to obtain this sample.)

In a new study, researchers showed that vaccines injected into the eyes of mice can help disable the herpes virus, a major cause of brain encephalitis. To their surprise, the vaccine activates an immune response through lymphatic vessels along the optic nerve.

Wanting to explore immunological interactions between brain and eyes, the research team, which was led by Song, found that the eyes have two distinct lymphatic systems regulating immune responses in the front and rear of the eye. After they vaccinated mice with inactivated herpes virus, the researchers found that lymphatic vessels in the optic nerve sheath at the rear of the eye protected mice not only from active herpes infections, but from bacteria and even brain tumors.

Working adults aren't the only ones affected. Kids who stare at tablets or use computers during the day at school can have issues, too, especially if the lighting and their posture are less than ideal.

CVS is similar to carpal tunnel syndrome and other repetitive motion injuries you might get at work. It happens because your eyes follow the same path over and over. And it can get worse the longer you continue the movement.

When you work at a computer, your eyes have to focus and refocus all the time. They move back and forth as you read. You may have to look down at papers and then back up to type. Your eyes react to images constantly moving and changing, shifting focus, sending rapidly varying images to the brain. All these jobs require a lot of effort from your eye muscles. And to make things worse, unlike a book or piece of paper, the screen adds contrast, flicker, and glare. What's more, it is proven that we blink far less frequently when using a computer, which causes the eyes to dry out and blur your vision periodically while working.

Computer work gets harder as you age and the natural lenses in your eyes become less flexible. Somewhere around age 40, your ability to focus on near and far objects will start to go away. Your eye doctor will call this condition presbyopia.

Cut the glare. Change the lighting around you to reduce the effect on your computer screen. If light from a nearby window casts a glare, move your monitor and close the shades. Ask your employer to install a dimmer switch for the overhead fixtures if they're too bright, or buy a desk lamp with a moveable shade that casts light evenly over your desk. You can also add a glare filter to your monitor.

Rearrange your desk. The best position for your monitor is slightly below eye level, about 20 to 28 inches away from your face. You shouldn't have to stretch your neck or strain your eyes to see what's on the screen. Put a stand next to your monitor and place any printed materials you're working from on it. That way, you won't have to look up at the screen and back down at the desk while you type.

Give your eyes a break. Follow the 20-20-20 rule. Look away from the screen every 20 minutes or so and look at something around 20 feet away for about 20 seconds. Blink often to keep your eyes moist. If they feel dry, try some artificial tear eye drops.

Get your kids' eyes checked, too. Make sure any computers they use are set up at the right height and in the best light. Encourage them to take frequent breaks from the screen to give their eyes a rest.

The exam is simple and painless. Your eye doctor will check for vision problems that make it hard to see clearly, like being nearsighted or farsighted. Then your doctor will give you some eye drops to dilate (widen) your pupil and check for eye diseases.

Since many eye diseases have no symptoms or warning signs, you could have a problem and not know it. Even if you think your eyes are healthy, getting a dilated eye exam is the only way to know for sure.

The Eyes Have It is an interactive teaching and assessment program on vision care. The Instructional Mode provides an overview of the visual system and disorders of the eyes using photographs or captioned streaming videos supplemented with text. In Quiz Mode, users have a chance to test your knowledge and be scored. There is a quiz corresponding to each topic in the Instructional Mode.

Your risk for some eye diseases and conditions increases as you grow older, and some eye changes are more serious. Keep your eyes as healthy as possible by getting regular eye exams so any problems can be spotted early.

Normal changes in the aging eye usually do not harm your vision. However, sometimes they can be signs of a more serious problem. For example, your eyes may leak tears. This can happen with light sensitivity, wind, or temperature changes. Sunglasses and eye drops may help. Sometimes, leaking tears may be a symptom of dry eye or sign of an infection or blocked tear duct. Your eye care professional can treat these problems.

During this exam, the eye care professional will put drops in your eyes to widen (dilate) your pupils so that he or she can better see inside each eye. Your vision may be blurry after the exam, and your eyes may be more sensitive to light. This only lasts a few hours. Make plans for someone else to drive you home.

The following eye problems can lead to vision loss and blindness in older adults. They may have few or no early symptoms. Regular eye exams are your best protection. If your eye care professional finds a problem early, often there are things you can do to protect your vision.

Vision rehabilitation programs and special aids, such as a magnifying device, can help you adapt to vision loss and make the most of your remaining sight. There are also programs, such as the National Library Service, that link people who have low vision or visual disabilities to resources at no cost.

Remember to ask your eye doctor if it is safe for you to drive with your vision. If you have to stop driving, organizations in your area may be able to arrange rides for you, or public transportation may be available.

He's searching for clues indicating the effects of high blood pressure, or hypertension, and what he finds could help prevent heart attacks, strokes and other serious health problems far beyond the eye.

"We can see changes due to vascular conditions caused by diabetes or hypertension," said White, an optometrist with Baylor Scott & White Health in Temple, Texas. "The blood vessels in the retina can become a little more stiff and hardened. They'll push on each other and cross, like two hoses in a confined space.

Vision symptoms may not show up for years. But ultimately, high blood pressure can result in hypertensive retinopathy, blood vessel damage causing blurred vision or loss of sight; choroidopathy, a buildup of fluid under the retina that can distort or impair vision; or optic neuropathy, a blood flow blockage that can kill nerve cells and cause vision loss.

"Sometimes people will say, 'I'm just here to get my glasses. Why are you checking my blood pressure?'" he said. "We try to inform them about the unique opportunity we have to look at these blood vessels in the eye."

A 2013 study reported in the journal Hypertension underscored the point. Researchers checked about 2,900 patients with high blood pressure for hypertensive retinopathy, then tracked them for an average of 13 years. They found that those with a mild form of the condition had a 35 percent greater risk of stroke. That increased risk leaped to 137 percent for those with moderate or severe hypertensive retinopathy.

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