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Lasik Effect on Cornea

Lasik is a commonly used surgical method for correcting many a refractive errors. Through Lasik The Corneal tissue shape is altered so as to correct the vision impairment problems. Lasik is much sough after as the surgical procedure in itself does not take too long and the healing process is also fast. The pain involved in the procedure is also minimal. It is a surgery which involves very high precision and the carving of the corneal tissue is very fine. Whatever the kind of vision problem, altering the corneal shape is a practical solution. In case of abnormality in the corneal tissue it is possible that some complications may arise during Lasik. Lasik is advancing at a very fast pace and is a good surgical option but there are also certain complications that may arise.

A corneal infection is a possible complication of Lasik. Corneal infection because of a Lasik surgery is not a major problem. Corneal infection is a more common problem in other PRK surgeries and less so after Lasik. Although the corneal infection after Lasik does not have any long term impact on the eye, the only problem is the slight discomfort that the patient would face. The healing process also slows down with such a complication.

Corneal Haze is also another potential problem that may occur after Lasik. It is not unusual for corneal haze to develop after Lasik as it is a potential problem after any sort of refractive surgery. The corneal haze does not affect the final vision of the patient. This problem can only be seen by the ophthalmologist under a microscope. But there have been instances where the corneal haze has shown to affect the final vision of the patient. If this condition is detected then the patient would need a second surgery to correct the problem. A point to be noted is that the chances of ending up with corneal haze of excessive nature are higher in PRK surgeries than in a Lasik surgery.

Another effect of Lasik on the cornea is the Halo effect. This becomes a problem when bright light hits the eye. A faded image is seen around the actual image. This happens due to the image being produced by the untreated portion of the peripheral cornea. A further potential problem is if the corneal flap is distorted in the healing process; then this can affect the shape of the cornea. There are many a problems that can affect the cornea in a Lasik but most of them can be corrected and there is no reason to be alarmed. Lasik is a very much preferred solution for eye problems.

Categories: Eye Test

Keystone Eye Care Group

How to Improve Eyesight

Vision is one of the best gifts granted to us. We tend to take this for granted. When our eyesight starts giving trouble that is when we realize its value. Like exercise is essential to maintain a healthy body, the same is true for the eyes too.  The eyes can be affected by many problems astigmatism, color blindness, cataract, conjunctivitis, glaucoma and various others. Many of them would have to be treated with oral medication, surgeries or other methods like use of external aids such as spectacles and contact lenses. Having said this it is also true that many types of eye problems can be avoided to a large extent by taking care of the eyes and many problems can be corrected with methods used to improve eyesight. Blessed are those who have good Eye Sight. But the others need not worry as eyesight can be improved to a certain extent by following some simple tips. Some eye exercises which would help in distressing the eyes and improve eyesight are given below:

1.  Sit in an upright position and rub your palms till they become warm and then hold it against your closed eyes. This will help in relaxing the eyes. Practice deep breathing while doing this exercise. Repeat it a number of times.
2.  Rolling your eyes clockwise and anti-clockwise helps the eyes. Remember to blink in between every repetition.
3.  Focus on an object close to you for sometime and then look at an object that is beyond it. Now again focus on the object close by. This helps in focusing on a close object, shifting focus and then again focusing close by.
4.  People who tend to watch too much of television or those who work long hours using the computer also face eye problems. It is important to look away for sometime every half and hour and focus on some object far off. This reduces the strain on the eyes.
5.  A healthy diet also plays an important role in shaping your eyesight. A diet rich in Vitamin A, C and E helps in reducing the chances of contracting cataract or being affected by eye problems like macular degeneration.

If the exercises are done regularly and a balance diet is maintained one can to a large extent maintain good eyesight and improve Eye Sight that has just started giving trouble. The exercises mentioned do not consume much time and can be accommodated in any busy schedule. A little time spared for your eyes will go a long way in having good eyesight.

Eye Care & Vision Problems : What Is Done in an Eye Exam?

Cornea Abrasion

The cornea is the outer most transparent portion of the eye which works mostly as a protective shield to the iris and pupil. A cut or scratch in the cornea is known as an abrasion. Corneal Abrasion can happen due to various reasons such as scratch from fingernails, foreign objects such as metal shavings or dirt affecting the eyes, overexposure to UV rays, wearing contact lenses for long period of time, brushes used for makeup and many such similar factors can affect the cornea.

But the cornea usually takes care of small abrasions on its own. The healthy cells take necessary action and slide themselves over and cover the injured portion so as to avoid any further damage to the cornea and prevent any kind of infection that is likely to affect the eye. Certain things can be done at home itself so as to avoid corneal damage.
1.    Rinse your eye well with water.
2.    Keep the eyes closed for sometime. Do not rub.
3.    Artificial lubricants that make your eyes tear are good.
4.    Over the counter medicines for pain would help but if the pain persists even after one dose it is best to consult a doctor.
But in case the abrasion is too deep, the healing process takes much longer and in the meantime the person would experience symptoms like pain, blurring of vision, spasm in the eye, redness of the eyes, tearing and also extreme sensitivity to light. If this happens then one should not wait for the cornea to heal on its own but seek professional help. Antibiotics and cycloplegics would be used to treat the problem. Seeking medical help would be the solution when you experience eye pain without any significant problem, blurring or loss of vision and such other problems. Sometimes the wound can be so bad that a corneal transplant can be the only solution.

Opthalmoscopes are used to determine corneal abrasions but a better option would be slit lamp microscopes which give a more magnified view of the problem. Evaluation can be better with the slit lamp microscope. It is important to let the doctor know all the treatment and medication that has been taken in advance. Corneal Abrasions can happen to anyone anytime but those who are involved in work such as welding and contact lens wearers are more at risk. One can take precautionary measures at times. Wherever possible it is important that the eyes are shielded well. In case a corneal abrasion still happens seek medical help at the earliest so that the vision is not affected.

What is Cornea?

November 29, 2010 Leave a comment

The cornea can be said to be a very important part of the eye. It is located in the front portion of the eye and is transparent. The cornea provides a wrap for the anterior camber, iris and the pupil. It works as a protective shield and does not let germs and other harmful particles affect the eyes. It also controls the penetration of light and helps in focusing. It along with the lens is responsible for refracting light and helps the eye focus. The Cornea is accountable for most of the (approximately 2/3rds) optical power of the eye. The cornea is very sensitive because of the unmyelinated nerve ending. It is sensitive not only to touch but also to chemicals and temperature. The reflex action can be seen when it is touched as it involuntarily causes the eyelid to close. It is probably the most sensitive tissue in the human body. A very interesting fact about the cornea is the absence of blood vessels. Because it is absolutely essential that the cornea remains transparent, the blood vessels are absent. Another interesting fact is that the cornea has 5 layers. Let us briefly look at the 5 layers of the cornea:

1. Corneal Epithelium: is a tissue layer which is multicellular. They grow rapidly and the cells are easily regenerated. This layer stays moist due to tears.
2.   Bowman’s Layer: is a very strong layer in the cornea. It provides a protection to the corneal stroma. The layer is 8-14 microns in thickness.
3.   Corneal Stroma: this is the middle layer of the cornea. This is probably the thickest part of the cornea as 90% of the thickness is that of the stroma. It is made up of type 1 collagen fibrils having close to 200 layers.
4.   Descemet’s Membrane: is a very thin layer that functions as a customized base membrane of the corneal endothelium.
5.  Corneal Endothelium: is the layer which regulates the flow of fluid and solute between 2 compartments i.e. the corneal stroma and the aqueous.

In refractive surgeries, the corneal shape is changed due to which the person can avoid using corrective lenses. Most advanced techniques use lasers which help in reshaping the cornea.

Total Eye Care

November 12, 2010 Leave a comment