When there are some disorders or diseases on our eyes, the cornea shape will change. So doctor uses corneal topography to map the cornea to check Keratoconus and other progressive eye diseases. And it is proved corneal topography is one of the best way to test the cornea and diagnosis of eye diseases. The following will give some introduction on how to use corneal topography to check Keratoconus.

For people with healthy cornea, the cornea in the corneal topography is smooth and flat, and there is a 90 degree axes perpendicular in the cornea. And if there is any irregularities, that means there are some problems with the cornea. For example, irregular astigmatisms can be diagnosed if there is steepening or irregular shaping of the axes. When doctors use corneal topography to check Keratoconus, they can make a judgment from “Inferior Steepening”. For people who have corneal astigmatism, their shape of the cornea is like a football, while for normal ones, it should be round and smooth.

In addition, Keratoconus has some similarities with Pellucid Marginal Degeneration (PMD) from the corneal topography, which may cause people some confusion about them. Dr. Schalaeppi discovered PMD in 1957. Known as the peripheral form of Keratoconus, PMD means a lobster claw pattern by breaking down of the cornea. So we can see PMD and Keratoconus are in the same family and not easy to distinguish them. However, PMD still has its own specific feature. You can distinguish PMD from the steepening, which is from the outer margin of the cornea heading inwards, like pinching the center. And the signs of PMD are as following: Compared with Keratoconus, people can not feel pain with PMD. However, they can feel their visual distortions. In addition, there is no vascularization of the cornea and no scarring. And there is lobster claw formation with PMD.

Just as other eye diseases, the regular test at the eye doctor is critical for Keratoconus. Therefore, visit your eye doctor at a regular time and have a baseline corneal topography. The corneal topography can tell you if you are far away or bothered from Keratoconus. If you are unlucky to have this kind of eye disease, the test can help you to treat or stop the progression of Keratoconus in time, and finally to help you to have a good treating result. So please don’t forget to visit your eye doctor and have your eyes checked at a regular time.

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To wear designer sunglasses is a dream for most people, which not only express their senses of style but also show their tastes, however, designer sunglasses usually are inclined to be expensive. Therefore, purchasing cheap designers sunglasses should be a beneficial way, providing your a fashionable and stylish look as well as saving your a lot of money. However, how can we get cheap designer sunglasses? One of the best places should be on internet.

On line, many designer sunglasses of discount prices are displayed. There you are able to easily compare prices just by clicking the mouse. If you are not sure which brand you should choose from, just have a try in exclusive stores to find a pair that you love, and order the same one in net. This is considered the most beneficial way.

As a matter of fact, in order to save more money, you can even bargain with the seller. Every year new models of different top brand names, such as Gucci, Ray Ban, etc. will come out, that is to say the previous models are outdated. You can just take this advantage to bargain with the seller that since they are outdated, and they are not so favorable, therefore, why you just sell them in a lower price.

In addition, another way to purchase cheap designer sunglasses is to purchase replicas, which tends to be so cheap that you may not believe. However, cheap as they are, replicas are usually not a advisable way, for they are in low quality and can not protect you from harmful rays and harsh sunlight. Money is better to spent buying the sunshades that are really worth it.

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As we know, vision is the most important sense for people that everyone should take good care of. For a family, the vision care should also be a critical part in the health care schedule. But in fact, many families have not paid enough attention to it, which leads to more possibilities of vision problems and losses. The following will introduce some tips for family vision care, which is expected to give every family some helps with their vision health.
First, we must have a good vision clinic with excellent customer service, which will play an important role in keeping family members’ vision health. When searching for the clinic, we must make sure they can give us appointments at a reasonable time to answer our questions or solve our problems. Imagine an excellent clinic, but they are too busy to give you any appointment. Certainly this can not satisfy your needs. Besides, the customer service must be good and the service people are pleased to answer patients’ questions or give help without hesitation.
Second, good and dedicated eye doctor is also very important for keeping our eyes’ health. The eye doctor not only has to be qualified, but also to be concerned with his patients. And more important is the eye doctor must have enough time to offer their service to patients’ needs. So we should take some initiative to search for the satisfied eye doctor. For some eye doctors, they have testimonials on their websites, so we can research them from their testimonials.
Third, keeping family members visiting the eye doctor at a regular time, in this way, eye problems will be found sooner, and then they can be treated more easily and better. And some potential eye problem can also be detected. Usually, a family should see eye doctor every two years. And if there is any risk factor in the eye, such as Diabetes, it is recommended to visit the eye doctor once a year.
Last but not least, we should make good use of every opportunity to learn some vision care knowledge. In daily life, when you face any vision problem, just raise it when visiting the doctor. Don’t hesitate to ask questions from your eye doctor. And make sure you can fully understand what the eye doctor says, if not, ask him again until you get it. One point we should know is the more we know about vision care, the healthier our family members’ vision will be.
If you want to know more about Vision knowledge, then feel free to visit http://blog.firmoo.com/

CR-39 lenses and polycarbonate lenses are two main types of lenses widely used worldwide. But people may not know much about their features and their differences. The following will give some introduction on these two kinds of lenses and their differences in the hope that people can choose the suitable lenses they need.

What is CR-39? CR-39 is an optical degree for plastic polymer which is measured by the light weight, chemical resistance properties and tint-ability. Polycarbonate lenses are characterized by strong impact resistant ability, which has been widely used in recent years. The main differences lies in CR-39 and polycarbonate lenses are as following:

From the impact resistance aspect, CR-39 is not as strong as polycarbonate lenses. It is researched polycarbonate lenses can have ten times of impact resistant ability than normal plastics. So when people take some active sports, it is advised to wear polycarbonate lenses instead of CR-39 lenses. However, CR-39 is more scratch resistant than polycarbonate. But please note it does not mean CR-39 will not scratch, if not taken good care of, they will also scratch. And in order to have good scratch resistance, polycarbonate can also have some scratch-resistant coatings.

Though polycarbonate lenses are more impact resistant, but they can also be broken. The good point is when they are broken, they will be broken into big pieces. While for GR039 lenses, they will be broken into small pieces. Therefore, in this aspect, polycarbonate lenses are safer to wear compared with CR-39 lenses. What’s more, polycarbonate lenses are thinner than CR-39 lenses and they usually have a lighter weight, which enable them comfortable to wear.

With the rapid development of lenses technology and people’s knowledge about lenses and health increasing, people are desired to have lenses which also have UV protection ability. If you also have this kind of requirement, let me tell you that it is not hard to realize. Take polycarbonate lenses as an example, they can offer UV protection, and can stop 99.9% rays not only from sun, but also from fluorescent lights and even computer screens. So they can offer you the protection you need.

From the above introduction, we can see polycarbonate lenses are impact resistant, UV protection, and thinner and comfortable to wear, while CR-39 lenses are scratch resistant and have more choices for coatings and tints. Therefore, after you learning about this, I am sure you can choose the suitable lenses according to your requirement.

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I have ever performed ocular gymnastics when I was young to preserve eyesight, but I never get to know that even if I am nearsighted, I am also able to improve my eyesight, even restore my eyesight by exercises until one day one of my friend told me that. This is totally different from what my eye doctor has told me, either wearing eyeglasses or contact lenses or undergoing an eye surgery to correct my faulty vision.

On hearing this news, I was overjoyed, because I really want to get rid of glasses and I do not want to have any surgery, and now there finally is a natural way that I am able to restore my eyesight. Therefore, days later, I went to the place my friend told me where I could learn these methods and here I’d like to share some I have learned to all of you, hoping you can benefit from it as well.

1. Before any exercises, relax your eyes and eye muscles first, which you can accomplish either by closing eyes for having a rest or lightly rolling muscles around eyes.

2. Prepare a pen or pencil and sit in a chair at ease. Put the pen or pencil straightly before your eyes and gaze at it for a few minutes before you remove your gaze to some object in a distance of 10 feet. Repeat this action for 10 to 15 minutes to get the maximum result.

3. After the above procedure, stay in your seat and do eye rotation, moving your eyeball clockwise or counter-clockwise as you like. Keeping rotating for a few times will help to relax the tension of your eyes and muscles around. This is the the key step to help strengthen the muscles and improve eyesight.

As a matter of fact, if you want to know more techniques concerning eye exercises to improve eyesight, you can also search some on the Internet. Many more information related is displayed. Now, I keep on doing this vision improvement eye exercises regularly everyday, I believe one day I will be successful.

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The reason why you are reading this article is that you want to know something about ways for enhancing eye sight. In fact, the health of your eyes is greatly determined by two major factors, say, your food and the quantity of eye exercises that you have done.

Scientific diets can enhance your vision. Vitamin A plays a vital importance in maintaining your eye sights. Thus, vegetables, like carrots, corn, green peas, turnip, that contain a lot of Vitamin A, are strongly recommended for daily use. Still, many fruits are abundant with Vitamins A, viz. apricots, Papaya, etc. Still more, there is rich Vitamin A that can be found in the meat of some animals, as salmon, tuna, and so like.

If we are temporarily in lack of Vitamin A, our bodies will synthesis some from beta carotene. Generally, such vision decline is a process of oxidation, which may cause some sort of damages on our eyes. And consequently, such process can be prevented by Vitamin A. Therefore, if you do not have enough Vitamin A for the protection of your eyes, you will suffer from cataracts or other eye diseases, to some extent. This can prove that balanced diets can be beneficial for your eyes.

Eye exercise can enhance your vision. Some scientific eye exercise can help you to improve your eyesight. If you can insist on doing such eye exercise for about 20mintes each day, your eye sight will be greatly maintained and improved. Here are the specific steps. You should first relax yourself before starting the exercise. Close your eyes and palm them with your two hands respectively. Then open them 30 seconds later. Repeat this process for more times, and you will be greatly relaxed.  After the first step, just rub your eyes around the sockets with your eyes closed. Be sure that this process should be gentle and slow. After the second step, you can now open your eyes and turn your eyeballs around in one direction or another for sometime. After that, do some up-down and left-right eyeball movements. Anther interesting step is looking at a paper, on which two close dots are printed. Then you more your head forward or the paper backward, till you they are seemed merging into one. This process should also be repeated for sometime.

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Designer sunglasses, delicately designed and exquisitely made, are appealing to many people; however, not everyone is able to afford one. For those who are short of fund to purchase a pair of designer sunglasses, the designer sunglasses replicas come to their choices for fashion, because, fake designer sunglasses are rather cheap. Whereas, the point is that designer sunglasses replicas are not worth your money in the long run.

Replicas are both in low quality of lens and frame. Firstly, lenses of fake designer sunglasses are easily scratched and are likely not to have sufficient or even no UV protection. If a pair of sunglasses can not shield eyes from harmful rays from the sun, how can it called ‘ sunglasses ‘? Secondly, frames of those knockoffs are easy to be broken, either screws loosened or legs came off. Sometimes, frames of replica are not able to be cling to the face, which makes the wearer uncomfortable and inconvenient.

On the contrary, the above problems of lens and frame seldom emerge as for certified designer sunglasses. Even if there exists one of such problem, you do not have to worry or complain, because the original designer sunglasses are all covered by some type of warranty which can protect you in the event of an accident. Whenever and wherever you find your sunglasses provide discomfort to you, you can take them to the exclusive stores for change even for return.

Therefore, we may make a conclusion from the above that designer sunglasses knockoffs are not worth your money. Although original designers are comparatively more expensive, if you take the performance and quality assurance made by sellers into consideration, you will more likely to buy certified designers.

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Almost 5000 people in America lose their eyesight unnecessarily each year. Most are due to common eye disease, such as cataracts and glaucoma, which can be avoidable by suitable diets and good habits.

A balanced diet and a good habit are introduced to keep good eyesight in the following.

Blueberry is rich for antioxidants which can effectively prevent the age-related macular degeneration (ARMD) mostly happened among the elderly. ARMD is regarded as the main cause of age-related blindness, so eating more blueberries can delay or avoid the disease.

Spinach is abundant with lutein which can also prevent the ARMD and cataracts diseases. Fat, such as olive oil is suggested to take with spinach for better absorption.

Red onion but not the yellow one is affluent in element of quercetin, one kind of antioxidants, which can act as the same function to guard against ARMD and cataracts diseases.

Fish is full of omeg-3 fatty acids which is the bane for dry eyes. You are recommended to have fish twice a week. If you are not able to take fish for some reason, you can exchange for other kind of food containing the same nutrients.

Sweet potato contains high Vitamin A, which is useful for enhancing the night vision.

Greasy or sweet foods, high in omega-6 fatty acids, deteriorate or cause the ARMD disease. So you’d better be away with this kind of food, including potato chips and hamburgers.

Multivitamin pills contain various different Vitamins which are needed by our body to keep in an excellent condition, so you can take the pills every day to guarantee the body requirement. At least 150mg Vitamin C is needed to prevent cataracts effectively.

Smoking is bad for your whole body, and eye is no exception. Smoking is one reason for ARMD, glaucoma and dry eyes. Considering from your eyesight, please get rid of the awful habit.

Do not let the air from air-conditioner to blow your eyes directly. Because long time exposure will increase the choice of dry eyes, then the following corneal abrasion.

Do adjust your computer below your eye level to make sure that your eyes can be half-closed when looking at the screen. In this way, the possibility of fluid evaporation and dry eyes can be greatly reduced.

No one would like to get an eye surgery. No one would like to wear eyeglasses. However, everyone would like to have good eyesight. If you pay attention to your daily lifestyle, you may discover that it is possible to maintain good vision in a natural, effective and cheap way.

If you want to know more about Vision knowledge, then feel free to visit http://blog.firmoo.com/

Several years ago, I discovered 1Day Acuvue contacts and I had worn them since then. Now I have never felt any discomfort from these contacts, manufactured by Johnson& Johnson. I think I will use these products in all rest of my life.

It is true that I seldom spend time in searching of some new contacts, but I do have suffered from some discomfort in wearing other lenses. Luckily, when I begin to use 1 Day Acuvue, what I feel is freshness, comfort, and happiness. Even though I have changed so many pairs, my feeling does not change.

It is true that I have to dispose a pair of such contact everyday. I have spent a very long time to get used to this occasion. But I think it is essential to do so for the following reasons.

Wearing these contacts will cause no infection in my eyes. Of courses, as their names indicate, I need not to maintain these contacts every day. What I can do is to get a new pair and throw the older one away.

These contacts have very long expiration time if I do not open and use them.

In addition to 1day Avuvue, Acuvue Moist has also provided me with great comfort and freshness. Compared with 1Day, Moist Series can keep much longer comfort and freshness.

Of course, the moist series are ideal for people with dry eyes. Any way, 1 Day acuvue is price to value. Though it seems that these contacts are expensive, but no cleaning systems are needed. That has relatively reduced the cost.

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You might be confused about whether contact lenses can help to correct your vision. In fact, vision can not be corrected by wearing contacts. To some extent, contacts are only aiding tools, which can not enhance your vision at all. Hence, the way for your eye enhancement is not wearing contacts. Contacts can only bring to the wearers some very contemporary effectiveness. Neither can they fundamentally improve your vision. If you do not think so, just think how long you have worn contacts. If they really work, you should have got rid of them.

One example can be used to prove this theory. Suppose one has broken his legs, and the doctor will no doubt just handle his problem simply, as putting aid brand only, etc.  If that really occurs, his legs will be in abnormal shape after being healed. This may lead some new bad habits in his walking. If the doctor treats his problem properly, his legs will recover normally. Comparatively, contacts just play roles of guiding eyes in their recovering. In this sense, contacts can not improve your vision naturally.

Generally, if you suffer from vision problems, it means that you have very bad habits in using eyes. Wearing contacts can help to correct such habits by guiding your body to heal themselves automatically. By and large, the major cause for eye problems is mental strain. Contacts can help you first to relax yourself. Because of this strain your eyes may get smaller, and you are prone to even worse eye problems.

Now that you have known this, you are suggested to use contacts as less as possible. If you do some eye exercises everyday, you will get rid of these contacts ultimately. It is a fair exchange for you to do some eye exercises for several minutes other than wearing contacts forever. You may now have your own decisions. Yes, it is the time for you to get rid of these bothering contacts.

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