PRK is used to correct or reduce myopia (shortsightedness or nearsightedness), hyperopia (longsightedness or farsightedness), and astigmatism. The PRK procedure flattens part or all of the cornea which in turn allow focal point of light to focus more closely on the retina. PRK differs from Lasik in that it does not create a permanent flap in the cornea, instead it uses the excimer laser exclusively from start to finish, essentially scraping the top level of the cornea. The benefits of PRK is that it is simple and non-intrusive as compared to lasik. As with all surgery there can be complications.
Lasik stands for laser-assisted in situ keratomileusis, and is a surgical procedure used to “cure” shortsightedness, longsightedness, or astigmatism. “Keratomileusis” is the carving of the cornea in order to reshape it. Lasik Permanently changes the shape of the cornea using a special lazer called an eximer lazer.
As the laser reshapes the cornea, it changes the angle at which you see images and therefore strengthens your vision significantly. This reshaping adjusts and strengthens the power of your cornea to focus on objects near and far. If you are nearsighted, your doctor uses the laser to flatten your cornea that is too-steep. If you are farsighted, your doctor uses the laser to make your cornea steeper because it is too flat. For astigmatism, the laser can be used to smooth an irregular cornea into a more smooth shape. There are few other procedures like Lasik Eye Surgery that can give you these amazing results and permanently change the shape of your cornea in just minutes.
The lasic procedure of lasik is:
- A suction ring is placed on the eye to stabalize and monitor pressure
- A microkeratome, a cutting instrument, is attached to the suction ring. This blade cuts a flap in the cornea
- The exposed inner layer of the cornea is reshaped with an eximer lazer
- The corneal flap is returned to the original position
The patient walks in to the surgery, have the procedure, and walk out again being awake the whole time. The doctor performing the surgery may also administer a mild oral sedative.
The marketing for this procedure says that lasik provides benefit to millions of people, however, it doesn’t really solve the underlying cause of poor vision. If they were myopic before, their eye is still mis-shapen. They may be able to see perfectly well after the surgery, but years down the line myopia may return. There are also possibilities of complications that could affect your vision.
One of the most irritating things to suffer from is a twitching eyelid. They can persist for months for some people, and becomes annoying and can even make a person self conscious. For some people it is intermittent, or it may affect them only once.
What is an aye twitch and why does it happen?
An eyelid twitch is an involuntary spasm of one of the small muslces. There can be many causes of this, becuse of tiredness, too much caffeine, or stress. Some nutritional deficiency such as calcium and magnesium can also be a factor. There has also been some evidence to it being a genetic trait, so you may be more susceptible if your parents or grandparents regularly suffered from it.
Is it serious
In most cases the twitch is not serious and can be simply alleviated by small changes to the diet, reducing stress, more rest, relaxation, sleep, or reducing caffeine.
If there is a more pronounced degree of twitch, such as the eyelid becoming forced to close entirely or the symptoms last for more than a few days, the cause may relate to an irritation to the cornea or conjunctiva. If this is the case a visit to your optician or doctor may be advisable to determine if this is the case and further treatment or investigation may be needed.
If you believe stress is the cause for the twitching, it is vital that you assess your stress level and try and find ways of either reducing the stress you are exposed to or finding better ways of managing the stress you do receive as eyelid twitching is only a minor side-effect of stress and the other possible reactions going on in your body may be a lot more serious including high blood pressure, altered mental state and an increased risk of damage to your heart.
In most cases, the twitching can be relieved by simply allowing yourself more time to rest and unwind. Try getting a few more hours sleep or changing your routine so that your can get a little more sleep each night.
In many cases sleep is enough but if the twitching continues it could be that you are drinking too much tea or coffee as caffeine has also been identified as a risk. Switch to decaffeinated products or even better, exchange the tea or coffee for herbal teas or drinks that induce sleep and benefit in both ways.