Pre-examination Vision Correction Operation
Pre-examination Vision Correction Operations
The significant development in medical technology has revolutionized the field of ophthalmology. After the medical eyeglasses were a unique medical event at the time, it became possible to dispense millions of eye patients with glasses, using mechanisms that can correct vision and stabilize it for many years, so eye corrections by LASIK and others have emerged. Still, vision correction operations need several procedures before they are performed, as well as need specific conditions for those who perform these operations.
This article is about vision corrections, procedures, and checks.
Age of vision correction process:
The age of the appropriate vision correction process is the age between 25 and 40 years because looking at this age is stable. In general, age is necessary compared to the constant use of one eyeglass for several years, just as the age of eighteen is the age of the minimum vision correction process, which is possible with him to perform vision correction operations. Although this age is at which a person can undergo vision correction operations, doctors recommend that young people do not operate until the vision is proven for several years.
Types of vision correction operations:
There are many techniques and types of vision correction processes that have become available and are being applied, thanks to the enormous technological development, and these types are:
Photorefractive keratectomy (PRK).
Laser vision correction operations.
Radial corneal correction operations.
Lenses implanted inside the eye.
Femto Lasik operations (or Femto with laser help).
Refractive lens reflection exchanges.
Ring segment operations within the ICR cornea.
Laser keratinization processes on-site: Lasik.
Lasik eye correction process:
The vision correction process passes through LASIK in several steps and stages. Before the operation, all pre-LASIK procedures should be verified.
First step: anesthesia:
The doctor places a little drop of the drug in the eye so that the doctor can raise the eye and accentuate it to a certain level, which allows the vision correction to be performed with Lasik.
The second step: cleansing:
The surgeon places around the eye a little antiseptic solution (iodine) to cleanse the area around the eyes, eyelids, and around the eyelashes, and to prevent the infection from spreading to the eyes, which are subject to vision correction.
The third step: keeping the eyelids apart:
As far as possible, the doctor uses a specific machine to keep the eyelids apart, so that the doctor who operates can easily reach the cornea of the eye.
In it, the doctor places a small absorbent ring on the eye, and this ring represents the base of the device that will cut the cornea.
Using a device called a microkeratome, the doctor cuts the surface of the cornea into a crescent shape, and the device determines the depth of the appropriate cut, fixing the cornea upward.
The Sixth Step: Correction:
Based on the data available to the doctor about the patient’s eye before vision correction operations, the doctor requests the patient to look at the intermittent red light. The computer-operated laser excimer adjusts the shape of the inner cornea. This step or stage lasts from several seconds to about two minutes and returns; this depends on the patient’s condition and the degree of modification required.
Step Seven: Restore the situation to what it was:
The doctor restores the outer surface of the cornea that was cut when the vision correction process began and leaves several minutes to dry. The doctor may sometimes resort to placing a transparent plastic hardcover around the cornea for days so that the cornea is not harmed. Some doctors use different types of drops to protect the eye after performing vision correction operations. The patient feels an immediate improvement after performing a vision correction process with LASIK. Still, it is associated with a great feeling of pain. Even the full recovery of the surface of the cornea takes two weeks, during which the patient puts drops in his eye to prevent contamination or infection. At the end of the two weeks or the recovery period, the doctor removes the plastic cap that he put on immediately after performing a LASIK correction.
There are data that the doctor will ask you for in pre-Lasik procedures, namely:
Do you have any eye diseases, such as spring ophthalmia, color blindness, or white water in the eye? Or if you have glaucoma, glaucoma, or even a poor retina?
Do you suffer from some of the most common diseases, such as diabetes or high blood pressure?
Have you ever had any eye operations before?
Have you ever wore any contact lenses? And how long do you wear contact lenses if you have worn them? And how long has it been since the last day you wore contact lenses?
After taking this data, you will go through three tests, which are the necessary tests before the vision correction process:
The first of the necessary examinations before vision correction process:
The first examination is topographic imaging of the eye, in which specialized devices recognize the current shape of the terrain of the cornea of patients, who will undergo vision correction operations. These devices can capture a very particular type of image of the cornea. The camera used in this examination is called a very sophisticated and very fast Pentacam, which depicts the cornea on twenty-five different axes in just four seconds. After which the application of that camera merges the set of images taken by it to reach a specific form of corneal topography, including specification of the thickness of the cornea and the exception of keratoconus, if there any of that.
The second examination of the necessary tests before the vision correction process:
This examination is a measure of the power of vision, and this is done through a device called Auto Refractometer, which is a developed device, which measures the ability of the cornea to reflect rays, which the device places on the patient’s cornea, so the doctor in this examination determines the extent of vision impairment in the patient and knows each eye On the other, the problem you suffer from, whether it is nearsightedness, farsightedness, or astigmatism.
The third examination of the necessary tests before vision correction process:
This examination depends on the results of the previous second examination, in which the patient is subjected to experimenting with the measurements that the device concluded in the second examination, where he sits in front of a plate bearing the letter (E) or (C), and between him is between the plate six meters. The doctor measures the severity of his eyesight by the extent of his ability to determine the opening. In each letter, the physician realizes how well his eye can see things from this distance mentioned.
The benefit of measuring visual acuity in the experimental form - although it was done with the advanced device in the second examination - that the empirical examination is more accurate if conducted by an expert doctor, knowing that the Auto Refractometer measures the extent of visual impairment digitally, and the experimental test is more accurate for two reasons:
The first reason: The amount of improvement after vision correction operations depends on the extent of the improvement of patients, through experimental examination using lenses. That one of the patients may suffer myopia by -10, and after the experience of vision correction, he can see the degree 6/6. There another patient may suffer from nearsightedness by only -2, and after the experimental examination to vision correction with lenses, it improves by only 6/9. By 6/6, and the second will improve by 6/9; with the first being Do not look weaker before the procedure is performed than the second.
The second reason: that the patient who has farsightedness has a stressful process for him because the image that the eye takes and forms behind the retina makes the vision unclear. God has given the human eye the ability to adapt to the development of this farsightedness, thus pushing the eye to be on the retina directly, by pressing the muscles of the eye, seeing things does not represent any problem for the farsighted patient. The real question is that the vision is exhausting for the patient of farsightedness because he will not be able to put pressure on his eye muscles all the time so that he can see. This situation will cause him headaches and eye fatigue... The reason is here N advanced device - a device Auto Refractometer - will not be able to identify the problem that we have mentioned; it became necessary to undergo the trial revealed to consider before considering vision correction operations.
Benefits of vision correction:
Vision correction processes treat astigmatism, myopia, and hyperopia.
Vision correction processes treat vision problems in individuals who are nominated for future vision impairment or even those who may suffer from poor vision in old age.
Vision correction operations avoid using corrective lenses or eyeglasses because they adjust the cornea and lens to focus light on the posterior part of the eye.
Why is it not beneficial the Vision correction processes to consider aging corrections?
Vision correction operations will not be treated by people who - because of their old age - are unable to see close objects, so doctors treat this condition with what is known as “bifocal glasses.”
As you get older, the lens of the eye loses the ability to change its shape, and here the glass makes the eye focus on things carefully (studies are being done on developing vision correction processes in aging).
Conditions for conducting Vision correction operations:
For patients to perform Vision correction operations, the age must be 18 or above.
The patient can undergo an astigmatism procedure if he is twenty-one years old or older.
The medical glasses or contact lenses that the patient uses should not be changed for at least one year.
Depending on the patient’s condition, stability may be in the state of refraction for only a few weeks before performing Vision correction operations.
The nearsightedness of the patient should be between 50 and 14.00 Depot, and the Depot is the unit of measurement for contact lenses and glasses.
The measurement for astigmatism should be less than five depots.
In the case of farsightedness, the measurement should be more than 5 dB
Eye free from problems, such as herpetic keratitis, corneal scars, conical cornea, glaucoma, cataracts, or instability in refraction.
The patient is free from the following diseases: lupus and immunosuppressive diseases, such as AIDS, diabetic retinopathy, rheumatoid arthritis, or non-keloid disease during wound healing.
People who will undergo Vision correction operations should not be patients who are taking medications such as Imitrex or Amiodarone.
A gynecologist should be consulted before performing Vision correction operations for pregnant and lactating women.
Damage of Vision correction operations:
The damage that can occur to a patient after Vision correction operations are divided into direct after-operation damage, minor and temporary damage, and rare damage.
As for the damages that can occur immediately after Vision correction operations, they are:
It may lead to dry eyes because it may occur during Vision correction operations. The nerves responsible for the tear secretion process are cut off, and this matter does not last for long. The eye will return to secreting tears after those nerves have been healed again, but the person with dry eyes before performing Vision correction operations. It is subject to some complications, as follows:
Ulcers in the eye.
A burning sensation in the eye.
Lack of vision or (presence of blurring).
Sensitivity to light during a vision.
The following procedures can treat eye dryness after LASIK correction:
Eye drops that treat the nerves that secrete the eye’s tears.
Use moisturizers for the eyes.
Itching and a feeling of scrubbing and rubbing the eyes in the first days after the procedure.
From the damages of Vision correction operations on the first day after the procedure, the patient suffers from an inability to look at the light.
As with any procedure, there is a possibility that the subject will be infected with Vision correction operations.
Disadvantages of temporary and straightforward Vision correction operations:
Some people who have performed Vision correction operations complain that vision has not improved because they did not use eyeglasses until the view enhanced by a more significant percentage.
If the patient looks after the light after the Vision correction operations, he sees black patches mixed with the colors, and this does not last after the surgery for more than two to three months.
In the first month after Vision correction operations, some complaint of blurring of vision, but they get better over time, day after day.
Because of frequent eye rubbing, complications may occur with the cornea.
Infections occur in the surface area of the cortex, and the lower area of the cornea, and are treated with a doctor’s description of some drops.
Some people who perform Vision correction operations suffer from double vision.
As for the damage to the Vision correction operations that occurs rarely:
Irregularity of the surface of the cornea and the occurrence of warp in it.
Corneal microbes invade and cause inflammation due to inadequate sterilization of operating instruments, or inside the operating room. After undergoing Lasik Vision correction operations, please follow these guidelines to avoid complications from the process:
The person who underwent the operation must wear sunglasses for some time.
The patient is sitting in a humid place.
The person uses dehydration drops as prescribed by the doctor.
The convalescence period shall not be less than two weeks, during which the patient must be fully rested at home.
Contraindications to the Vision correction operations:
One of the contraindications to the Vision correction operations is the instability of the condition of the eye, it is advised not to perform Vision correction operations before the age of twenty, because there are changes that occur in the eye before this age, and this makes them unable to undergo these operations.
Take some medications that interfere with Vision correction operations.
A contraindication to Vision correction operations is hormone fluctuation, which is caused by diseases such as diabetes.
Problems affecting the immune system, such as collagen vascular disease, rheumatoid arthritis, and known skin disease (lupus), are a contraindication to Vision correction operations.
Suffering from keratoconus is among the things that prevent Vision correction operations.
Pregnancy, which causes hormonal arrhythmias, is one of the contraindications to the Vision correction operations.