Manual INSIDE MY EYES

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Academy Store. Why does it feel like something is rubbing against my eye when I blink? MAR 19, Question: Why does it feel like something is rubbing against my eye when I blink? Answer: If it feels like something is rubbing against your eyes when you blink it is called a foreign body sensation FBS.

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What is this white spot on my eyeball?

How about million rods and 7 million cones — in each eye! Rods see in black, white, and shades of gray and tell us the form or shape that something has. Rods can't tell the difference between colors, but they are super-sensitive, allowing us to see when it's very dark. Cones sense color and they need more light than rods to work well. Cones are most helpful in normal or bright light.

Flashes and floaters in the eye

The retina has three types of cones. Each cone type is sensitive to one of three different colors — red, green, or blue — to help you see different ranges of color. Together, these cones can sense combinations of light waves that enable our eyes to see millions of colors. Rods and cones process the light to give you the total picture. You're able to see that your friend has brown skin and is wearing a blue hat while he tosses an orange basketball.

Sometimes someone's eyeball shape makes it difficult for the cornea, lens, and retina to work perfectly as a team. When this happens, some of what the person sees will be out of focus. To correct this fuzzy vision, many people, including many kids, wear glasses. Glasses help the eyes focus images correctly on the retina and allow someone to see clearly.

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As adults get older, their eyes lose the ability to focus well and they often need glasses to see things up close or far away. Most older people you know — like your grandparents — probably wear glasses. Think of the optic nerve as the great messenger in the back of your eye. The rods and cones of the retina change the colors and shapes you see into millions of nerve messages.

Then, the optic nerve carries those messages from the eye to the brain! The optic nerve serves as a high-speed telephone line connecting the eye to the brain. When you see an image, your eye "telephones" your brain with a report on what you are seeing so the brain can translate that report into "cat," "apple," or "bicycle," or whatever the case may be. For crying out loud, the eye has its own special bathing system — tears! Above the outer corner of each eye are the lacrimal say: LAK-ruh-mul glands , which make tears. Every time you blink your eye, a tiny bit of tear fluid comes out of your upper eyelid.

It helps wash away germs, dust, or other particles that don't belong in your eye.


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Tears also keep your eye from drying out. Then the fluid drains out of your eye by going into the lacrimal duct this is also called the tear duct. You can see the opening of your tear duct if you very gently pull down the inside corner of your eye. When you see a tiny little hole, you've found the tear duct. Your eyes sometimes make more tear fluid than normal to protect themselves. This may have happened to you if you've been poked in the eye, if you've been in a dusty or smoking area, or if you've been near someone who's cutting onions.

And how about the last time you felt sad, scared, or upset? Your eyes got a message from your brain to make you cry, and the lacrimal glands made many, many tears. The eyes you have will be yours forever — treat them right and they'll never be out of sight! These small blood vessels are fairly fragile and can easily burst or break. When they break, blood leaks out and settles between the conjunctiva and the sclera. If the leak is small, a part of your eye may just seem a little red. However, if the leak is large enough, the entire white part of your eye may appear completely blood red and in some cases can actually bulge outward.

You may have a subconjunctival hemorrhage if you notice a bright red pool of blood inside your eye. The condition usually causes no pain or vision changes, but occasionally causes minor itching of the eye. A scratchy sensation may sometimes be felt upon blinking.

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Bleeding of the eye is usually caused by suffering an injury to the eye. Less common but serious causes of eye bleeds include cancer, malformations of blood vessels in the eye, and irritation and inflammation of the iris the colored part of the eye. Small subconjunctival hemorrhages can result from forcefully sneezing or coughing.

High blood pressure and taking certain medications that alter blood clotting mechanisms are other risk factors for subconjunctival hemorrhages. Occasionally, a subconjunctival hemorrhage can be a warning sign for diabetes , hypertension, bleeding or blood disorders, leukemia , and sickle cell disease. Get a complete physical if you have a subconjunctival hemorrhage more than twice in one year so you can ensure you don't have an underlying medical condition.

If you are concerned about bleeding in your eye, schedule an eye examination. Your optometrist will complete a careful medical history to rule out potential causes of the hemorrhage. Your eyes will be examined to ensure that the eye is intact and no other injuries have occurred to other structures of the eye.

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Your eye pressure will be measured and your eyes may be dilated so the doctor can look inside to make sure there is no trauma or bleeding deep inside the eye. It is important to have your optometrist or ophthalmologist examine the hemorrhage to identify a cause and rule out other possible health disorders. Try to remain calm if you suddenly notice blood inside your eye.