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Seeing stars is usually due to a lack of blood reaching the brain, and thus a lack of oxygen. Most commonly this happens after standing up quickly or straightening after bending over. You don't see it all the time because the arteries serving the brain reflexively dilate to maintain pressure, but those reflexes may be disturbed by lack of sleep or food, a hangover, or an infection. Physical trauma may also cause the reflex to malfunction, which is why stars float around Sylvester the Cat's head when he gets bonked. Rarely, seeing stars can be caused by too much blood reaching the brain. This doesn't happen much outside of the laboratory or a jet fighter, as the arteries have a very strong constriction reflex to keep it in check. The stars you see are actually neurons in your visual cortex misfiring, a hallucination at the lowest possible level. When the neurons' oxygenation changes drastically, their membrane potential also changes. Ordinarily this wouldn't matter, because all of the surrounding neurons' potentials would change at the same time. When it happens due to standing quickly or taking a few G's of acceleration, the change happens so fast that the neurons closest to capillaries change well before the surrounding neurons. This causes them to fire spontaneously which your brain interprets as vision; you see stars. Another possible cause of seeing stars is posterior vitreous detachment, which mostly affects people over age 50. PVD happens when the eye's vitreous shrinks and collapses, detaching it from the inner surface of the eye. This causes all manners of floaters and distortions to be visible, including ones that look just like the stars mentioned above. PVD can result in retinal breakage or detachment and thus cause blindness, so if you notice a sudden onset of seeing stars and other visual phenomena you should probably go see your doctor.
Well, that is an easy question, if the contacts you have are not given by your friend or someone, then perhaps you know the duration of the contact lenses right? If you cannot remember , just bring the invoice to the clerk to see if they are expired or not. Basically, a pair of contacts will be good to use for a couple of months. Also, you should take care of them and fill solution with them to keep them clean.
Absolutely it does not exactly hurt your eyes. In ancient times, people read and write all ways in dim light, such as by candlelight or with gas or kerosene lamps. However good light is good for your eye protection indeed. Many of us have deep misunderstandings of eye harmful factors. Many of us believe that eat carrots is helpful for vision because of rich vitamin A in them, however, in the world exists many fruits and vegetables contain rich Vitamin A. So, a well-balanced diet is just Ok. www.eyecareamerica.org, a excellent site, which offer you much more information about your questions.
Sure, just have a try and it works well.
Twilight is really hot. Many people want to buy such contacts. There is buyer, there must be supplier. You can try to get them in online eyeglasses store. You type your key word in google, and then you will find what you want. Here I recommend you a website www. amazon.com which is a very famous b2b website in the world. In addition, I want to be nice to advise you reduce the time of wear such contacts because they might be harmful for your eyes.
Dear friend, eye doctors might do this to any patients. The dilation of the pupils can help the doctor to diagnose potential diseases or infections when he is checking our eyes in this way. I just have my eyesight checked yesterday. But how often the doctor dilates our eyes may depend on the doctor.
Switching from wearing eyeglasses to using contact lenses is not as difficult as that you might imagine. It is easy. I have tired. Now, i have prepared both contact lenses and prescription eyeglasses for wearing in different occasion. Just take an eye exam to get the prescription for contact lenses. Then, buying suitable contact lenses that fit for your eyes and meet your vision requirements. At the beginning, you may fell uncomfortable for the lenses to contact your eyes. Just a few days, you will adapt it.
As a matter of fact, goopy eyes is propbably caused by heat and toxin accumulated in body or eye infection. It always let you feel burning, pain and redness or else in eyes. As far as i know, it's quite normal and there are several home remedies to solve the problem. First, drink some water with honey which is good to reduce blood pressure, and then the blood vessels will not so prominent. Thus your symptom will be slightly. Next, apply warm compress on eyes, several times per day, 5 to 10 minutes at most each time, which is quite helpful for eye infection. By the way, don't rub your eyes with dirty hands or towel. Last but not the least, have a light diet with more fresh vegetables and fruits. Keep these tips as habits, and you will see changes soon.
Yes, it is possible for you to cause the styes from wearing the old contact lenses because of the eyes infection. As we know, the styes may be caused by the invisible bacterium. When you wear the old contact lenses, your eyes may get the infection easily because of the lack of water content. You could use some eye drops to release the symptom. You should not wear the old contact lenses any more. You could use the warm compress to make your eyes feel comfortable. You should just choose the clean cloth and some hot water to make your eyes feel comfortable. You will be comfortable at the eyes if you do the home remedies to treat it.
Surely,there is also growing evidence that nearsightedness may be caused by the stress of too much close vision work. It normally first occurs in school age children.
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