چرا و چه زمانی باید عمل جراحی پی آر کی را انجام داد؟
پی آر کی از اولین عملهای جراحی برای رفع عیوب انکساری چشم میباشد که برای اصلاح نزدیک بینی، دوربینی و آستیگماتیسم به کار میرود. در مقایسه با عمل لیزیک، طول مدت بهبودی عمل پی آر کی کمی طولانیتر میباشد. با این وجود، این عمل به طور گستردهای انجام میشود و در مواردی مزایای قابل توجهی در مقایسه با لیزیک دارد. مکانیسم این عمل مشابه لیزیک میباشد. به بیان دیگر، توسط لیزر در قرنیه تغییر شکل صورت میگیرد تا نور به درستی روی شبکیه متمرکز شود و بینایی فرد بیمار بهبود پیدا کند.
تفاوت اصلی بین پی آر کی و لیزیک در شیوهی دسترسی به محل درمان میباشد. به این صورت که در لیزیک لایهی بیرونی برداشته شده و شکل لولا به سطح قرنیه متصل میشود تا درمان انجام شود. این در حالی است که در پی آر کی تمام لایهی خارجی برداشته و حذف میشود. در هر دو روش به کمک لیزر اگزایمر لایهی استروما تراش داده شده تا عیوب انکساری مرتفع گردد.
نوع دیگری از جراحی پی آر کی وجود دارد که لیزک یا لازک نامیده میشود. در اين عمل پس از برداشتن لایه اپيتليوم (توسط ترفین)، سطح قرنيه همانند عمل پی آر کی با استفاده از ليزر اگزايمر تراش داده ميشود. پس از تكميل اين مرحله جراح با دقت اپيتليوم را به جاي خود برمیگرداند. LASIK compared to PRK surgery has a very slow recovery because the restoration of the epithelium layer is very time consuming compared to its regrowth.
PRK compared to LASIK
often the treatment results of PRK and LASIK are comparable to each other, but the initial improvement of PRK is achieved in a longer period of time due to the regrowth of epithelial cells. is In addition, there is a possibility of eye infection and blurred vision. Despite these cases, the PRK surgical method has the advantage that the entire thickness of the stroma layer is available for laser treatment due to the non-connection of the outer layer to the cornea. Therefore, in cases where the cornea is thin or the person has previously undergone LASIK, it is recommended to use PRK. On the other hand, during PR the probability of removing too much corneal tissue is minimized. src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI5MDAiIGhlaWdodD0iMzYwIiB2aWV3Qm94P SIwIDAgOTAwIDM2MCI+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgc3R5bGU9ImZpbGw6I2NmZDRkYjtmaWxsLW9wYWNpdHk6IDAuMTsiLz48L3N2Zz4=" decoding="async" class="aligncenter wp-image-3280 size-full" data-src="https://drsiamakzarei.com/wp-content/uploads/2020/05/prk-v-lasik.jpg" alt="Comparison of PRK and LASIK" width="900" height="360" data-srcset="https://drsiamakzarei.com/wp-content/uploads/2020/05/prk-v-lasik.jpg 900w, https://drsiamakzarei.com/wp-content/uploads/2020/05/prk-v-lasik-300x120.jpg 300w, https://drsiamakzarei.com/wp-content/uploads/2020/05/prk-v-lasik-768x307.jpg 768w, https://drsiamakzarei.com/wp-content/uploads/2020/05/prk-v-lasik-600x240.jpg 600w" data-sizes="(max-width: 900px) 100vw, 900px">
How is PRK performed?
In PRK, the epithelium layer in the center of the cornea is first removed by alcohol and special surgical tools. Then, the surface of the cornea is trimmed using an excimer laser to precisely adjust its curvature. At the end, the dressing lens is placed. The new cells of the epithelium grow again in five days, after which the dressing can be removed with the doctor's opinion. #000000;"> First, look for an expert doctor in the field of PRK. Next, the person is subjected to a full eye examination and the following tests for laser use:
- pupil size
- eye moisture and dry eye risk assessment
- corneal curvature
- corneal thickness
The specialist doctor will also consider the person's general health, medical history and use of other drug treatments. People who use contact lenses should leave the contact lenses for a while before the eye examination; Because the lens affects the natural shape of the cornea.
During the operation
PRK is performed on an outpatient basis for 15 minutes. The attending physician may use a mild oral sedative to relax the patient as much as possible. Anesthetic eye drops are also used. A speculum is used to hold the eyelids open. During the surgery, the patient is asked to look at a specific light so that the ophthalmologist can examine the inside of the eye with a microscope while sending light pulses to the cornea.
Laser energy removes the desired tissues in a microscopic size and gives the cornea a regular shape. Most people have not reported any discomfort during the procedure; However, the pressure on the eye may increase. PRK is performed on each eye individually (one after the other on the same day). Of course, it is also possible to perform the operation with a time interval.
Immediately after the operation
the person will be asked to rest for a short time so that you can return home after that (of course, someone should take you there). Doctor The doctor usually prescribes antibiotics, anti-inflammatory and pain relievers to reduce possible discomfort and speed up the healing process. It is necessary to pay attention to medical recommendations. To ensure the healing process, attend regular check-up and follow-up sessions several weeks after the operation.
Considering the longer course of PRK treatment compared to LASIK, one to three weeks after the surgery the person will be able to drive. Despite this, the person will achieve clear and stable vision three to six months after this surgery.
