The common sense has it that eyes are very important and they are in great needs of protections. Some people think that eye surgery is very important for them and they want to get it. But doing is harder than saying. Such procedure can only be operated by the licensed doctors with a lot of experiences. Even though, whether one can receive eye surgery is dependent on his or her individual conditions.

As for the term of eye surgery, many laymen will be confused by their various interpretations, which can be viewed in both macroscopic and microscopic viewpoint. For example, many people suffering from cataract choose to receive eye surgery for the sake of their aging crystalline lens, which can always lead to serious vision blurriness. The eye doctor will give different suggestions and methods for individualized people in different conditions. As for some people who are suffering glaucoma, which can always lead to vision loss if it is not dealt appropriately, can receive surgeries of different kinds according to the degree of their diseases.

Some refractive surgeries are essential for people who have to wear glasses and contacts, for these surgeries can correct the refractory errors. Many people suffering from strabismus often choose to get eye muscle surgeries. Still more, eye surgeries can solve many other eye problems or diseases. For instance, if people’s eyes are injured by some accidents, or there are some other foreign bodies in their eyes, eye surgeries are very ideal choices. But all these procedures should be under the guidance of your doctor.

With the renewal of technologies, there appears LASIK eye surgery, which can be bliss for all eyeglasses wearers. The statistics has it that people with astigmatism and myopia are very fond of LASIK surgeries. Getting these surgeries are very safe and patients will not feel any pains during the 30-minute-long operating process. By reshaping the deformed cornea to its original shape, the surgeries can present the patients are bright and new world. It is such a great pioneering undertaking that patients can get rid of glasses forever after the LASIK surgery.

If one is suffering some kinds of infections or other eye diseases before the surgery, it is very essential for his or her doctor to know. Based on this condition, the doctor can do some precautions for some other potential side-effects. Still more, one’s physical conditions should also be informed to his or her doctor, so as to assure that the doctor can make the best decisions on your surgery.

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·The Procedures of LASIK Eye Surgery

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Common Method of Refractive Laser Surgery
There are various methods employed for refractive laser eye surgery. These are divided into flab procedures and surface procedures.
* Flap Procedures: In such surgeries, a particular type of blade known as microkeratome is used for cutting a flap in the corneal tissue. The most common example of surgery under this method is called Lasik.
* Surface Procedures: In this process an excimer laser is employed for removing the front portion of the corneal stroma. Unlike the flap method this approach does not require the partial thickness cut in the stroma. Thus differentiating this method of handling the epithelial layer from the flap method. Photorefractive Keratectomy (PRK) and Laser Assisted Sub-Epithelium Keratomileusis (LASEK) are two common examples of surface procedures of refractive laser surgery.     

Examples of Refractive Laser Surgery
Lasik: This acronym stands for Laser Assisted In-Situ Keratomileusis. In this surgery, a flap is cut with the help of microkeratome blade. The thickness of such flap could be between 100 to 180 micrometers. The flap is then lifted and an excimer laser is used to remove the targeted tissues from the corneal stroma. The flap is then replaced after the removal of the unwanted tissues.
IntraLasik is another variant of this surgery. In this method the flap is cut with the help of laser. Where a microkeratome blade is used to create the flap, the proceedure is known as “traditional Lasik” in order to differentiate it from other forms of refractive laser surgery.
PRK: Photorefractive Keratectomy (PRK) was widely used for correcting the vision problems before the popularity of Lasik. In this surgery, the paitents recovery time takes longer than with Lasik.
LASEK: It stands for Laser Assisted Sub-Epithelium Keratomileusis and in this surgery, surface methods is used for correcting the vision problem.

The Laser Eye Center of Silicon Valley specializes in refractive laser surgery. This vision correction center specializes in all forms of Lasik, PRK and LASEK refractive laser eye surgeries.

Welcome to Laser Eye Center of Silicon Valley, one of the finest refractive laser surger centers in California.

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The most common complications seen were papillae and giant papillary conjunctivitis.  These can typically be treated and do not generally threaten vision. They typically cause infection, mucoid discharge, irritation, and blurred vision. Papillae and giant papillary conjunctivitis can lead to lens intolerance, forcing a return to glasses for best lens corrected vision.

Comparing Risks of LASIK and Contact Lenses

Although about half of contact lens users experience complications, contact lenses still compare favorably with LASIK and other forms of refractive surgery in terms of preserving your vision. Studies show that less than 1% of people receiving LASIK surgery experience a loss in best corrected vision.  However, the likelihood of a loss of vision related to contact lens use is still significantly less.

At one time, contact lens use was associated with a potential for vision loss as high as 0.9%, but improvement in contact lens technology and wearing habits has reduced that risk significantly.  Post-market studies required of all 30-day contact lenses approved by the FDA show that the approximate annual risk of vision-threatening microbial keratitis associated with contact lens use is 4 per 10,000 wearers, or 0.04%. If we assume a 14-year life for refractive surgeries, that amounts to a cumulative risk of about 0.6%. However, rates of infection are increased 4 times for people who wear contacts overnight, and up to 15 times for people who wear their contacts for more than two weeks.

LASIK complication rates resulting in vision loss used to be as high as 5%, but recently they have been reduced to about 1%, which is close to the rates for contact lenses. For most people, the comparable safety rate of LASIK seems better when compared to the vigilance necessary to keep contacts clean with daily, weekly, or biweekly removal and cleaning.

Safety Trends

However, in the near future, LASIK may be safer than contact lenses. LASIK has improved significantly in safety since its introduction. Advanced technology and experienced surgeons are largely responsible for the decrease in complications. As surgeons continue to gain experience and technology continues to advance, we can expect rates to continue dropping. Contact lenses, on the other hand, may be more risky in the future.

Microbial keratitis used to be caused by a relatively small number of microorganisms that were controllable with specific formulae of antibiotics.  However, in recent years there have been more outbreaks associated with Acanthamoeba and fungal species. Some of this has been associated with specific contact lens solutions.  Other times, it has been associated with the reduction of water quality standards by the EPA under the Bush administration. In the latter outbreak in Chicago during June to November of 2005, 40 people contracted Acanthamoeba keratitis, nearly seven times the historical rate of this type of infection.

In the future we may see more of what are described as “atypical” cases of microbial keratitis that may increase the risk of wearing contact lenses.

If you would like to learn more about the relative safety of LASIK and contact lenses, please visit the website of 20/20 Institute, with offices in Denver, Indianapolis, and Portland.

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Both adults and children can suffer from astigmatism. Common symptoms of astigmatism include blurry vision, headache, eye strain and distorted distance vision. Eye exams are critical to detect underlying astigmatism on children. The Ohio State University School of Optometry has ever found that 28% out of 2,523 children had astigmatism, which surely affected their school performance. What’s worse, most children are less self-aware about their vision problems.

Most of the astigmatism patients are born with that, which may get worse over time. Eye injuries, improper eye surgeries and keratoconus can also damage the corneal shape. The corneal shape of astigmatism patients is not perfectly spherical. Instead, it likes an oblong football, which causes light rays to focus on two points in the eye back. For regular astigmatism, its two meridians are located 90 degrees apart, so that it is easy to correct. However, irregular astigmatism has meridians that are other than 90 degrees apart, which brings more complexity for correction.

Prescriptions of eyeglasses or contact lenses for astigmatism correction usually have three parts. The first part is designed to provide common visual clarity. For example, convex lenses are used to correct hyperopia. A second part is particularly for astigmatism. And the third part is prescribed to bend certain light rays as a compensation for the cornea’s oval shape.

Nowadays, both rigid gas permeable contacts and soft toric lenses are available for astigmatism patients. Soft toric lenses can provide most comfort for most of people, while RGP contact are more competent for heavy astigmatism. If you can not get enough vision satisfaction from eyeglasses or contacts, refractive surgeries such as LASIK are the best choice.

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Using monovision, you can wear a contact lens for distance vision on your dominant eye and another lens for close vision on the other eye. With proper coordination, the two eyes perform well in seeing at all distances, creating acceptable and comfortable vision. Although monovision is rarely used, they fit most of the people without awareness of “distance eye” or “close eye”.

Two monovision variations are designed to suit personal vision demands. First type is mini-monovision. Some people may find that standard monovision can not provide clear distance vision. Mini-monovision adds a slight magnifying power to the close lens. People with mini-monovision can get a perfect vision if they spend much of their time in distance vision and only a little close vision. The other variation is modified monovision, which combines a single vision lens for the distance eye and a bifocal lens for the close eye. This type offer satisfying distance vision as well as acceptable close vision.

Monovision is sometimes a dilemma for some people, that it may bring neither perfect distance vision nor close vision. In addition, the two eyes may be not in perfect coordination so that depth perception is affected.

Monovision contact lenses’ fitting requires more skills and more time. The wearer’s vision dissatisfaction can be magnified even by a slight change in the lens power, which may also spend several days to adjust. In this consideration, monovision contact lenses fitting may be mostly charged twice the fee for a standard contacts fitting.

Monovision contact lenses can also be used for a test to refractive surgeries, such as LASIK, conductive keratoplasty and so on. These surgeries may realize monovision for your eyes. But a prior two-week test of wearing monovision contact lenses is necessary. You can ask your doctor for more information about the difference between monovision and bifocal lenses, and then choose the better one for your personal needs.

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Vision Library is the information source in area of vision care, including eyeglasses, sunglasses, contact lenses, sports protective eyewear, vision error and diseases, vision surgery, ageing and kid’s vision etc., solely sponsored by Firmoo.com, an emerging online optical store.

Article Source:http://www.articlesbase.com/vision-articles/asymmetric-monovision-contact-lenses-1296289.html