LASIK: Precision, Recovery, and Post-Operative Care

Q: LASIK: Precision, Recovery, and Post-Operative Care

Hello： The accuracy of laser vision correction has improved with advancements in technology, and the current level of precision is satisfactory. <br>The amount of correction needed must be confirmed multiple times by the physician before the procedure. <br>It is not determined by

Regarding LASIK?

Hello Dr.
Feng,
I would like to ask if the degree of myopia can be measured very accurately during laser eye surgery.
Is the measurement done automatically by the equipment and laser, or is it manually operated to determine the degree? For example, if the initial examination shows a myopia of 325 degrees (but the computer check seems to indicate a deeper level), will there be another examination before the surgery and right before the laser treatment? I noticed that the degree measured before the laser treatment was 275 degrees, and I am curious how the surgical degree is determined.
Will this affect the post-operative degree?
Additionally, for individuals with thin corneas, can a second surgery be performed? Does the cornea become thinner after the first surgery, and if a second or more surgeries are needed, is it dependent on the remaining corneal thickness? Or is it irrelevant, as long as the initial corneal thickness allows for unlimited surgeries?
After the surgery, I still had a slight myopia of 0.7 the next day.
Is this normal? How long does it typically take for the degree to stabilize? Will the measurements taken two or three days later be the fixed degree moving forward?
I also noticed a significant stinging sensation in one eye when applying the eye drops, while the other eye, which still has some myopia, felt almost nothing.
Why is there such a difference in sensation between the two eyes, even though both underwent laser treatment?
Lastly, could you clarify the purpose of wearing protective goggles at night and sunglasses during the day? Is it solely to prevent unintentional rubbing of the eyes, or do they serve other functions? If I can ensure that I do not touch my eyes, can I avoid wearing sunglasses or protective goggles for 24 hours?
I apologize for asking so many questions, and I am very grateful for your guidance, Dr.
Feng.
Thank you!

sandy, 20~29 year old female. Ask Date: 2007/02/03

Dr. Feng Jiefan reply Ophthalmology

Hello: The accuracy of laser vision correction has improved with advancements in technology, and the current level of precision is satisfactory.
The amount of correction needed must be confirmed multiple times by the physician before the procedure.
It is not determined by the machine in one go, but rather based on the physician's experience.
Corneal thickness is crucial for determining the safety of the surgery, so corneal thickness must be remeasured before each surgery to decide if the procedure can proceed.
Generally, vision stabilizes for regular activities about a week post-operation, with stable refraction typically achieved around one month, although individual variations exist.
Patients may experience sensations from the eye drops, which are generally related to corneal epithelial defects; pain occurs if there is a corneal abrasion, but as long as the wound is properly cared for, recovery can occur within a day.
Protective eyewear is important to shield the eyes from wind, dust, and sunlight, and to prevent accidental poking.
Many accidents are unpredictable and cannot be prevented by oneself, so wearing protective eyewear is safer.
Sincerely, Dr.
Feng Chieh-Fan, Ophthalmology.

Reply Date: 2007/02/03

More Info

LASIK (Laser-Assisted In Situ Keratomileusis) is a widely performed refractive eye surgery that aims to correct vision issues such as myopia (nearsightedness), hyperopia (farsightedness), and astigmatism. Understanding the precision of the procedure, the recovery process, and the necessary post-operative care is crucial for patients considering this surgery.

Precision of LASIK Surgery
The precision of LASIK surgery is largely dependent on advanced technology and the expertise of the surgeon. Before the procedure, patients undergo a comprehensive eye examination that includes various tests to measure the degree of refractive error. Instruments such as wavefront aberrometers and corneal topographers are used to assess the eye's optical system and corneal shape.
The measurements taken during these tests guide the laser in reshaping the cornea. While the initial measurements may vary slightly due to factors like the patient's eye condition, hydration, and even the time of day, the surgeon will determine the most accurate degree of correction needed. If a patient is found to have a different degree of myopia during the pre-operative assessment compared to previous tests, the surgeon will consider the most reliable and recent data to decide on the surgical parameters.

Recovery and Post-Operative Care
Post-operative recovery from LASIK is typically swift, with many patients experiencing improved vision within a day or two. However, it is essential to understand that the final visual acuity may take several weeks to stabilize. During this time, fluctuations in vision are common, and it is not unusual for patients to notice slight residual myopia or other visual disturbances.
Patients are advised to follow their surgeon's post-operative care instructions meticulously. This includes using prescribed eye drops to prevent dryness and promote healing, avoiding water exposure to the eyes for a specified period, and refraining from rubbing the eyes. The sensation of discomfort or pain can vary between eyes, which may be attributed to differences in healing or the degree of correction applied.

Considerations for Re-Treatment
For patients with thin corneas, the decision to undergo LASIK again (enhancement surgery) depends on the remaining corneal thickness after the initial procedure. Surgeons typically assess the corneal thickness before the first surgery and will evaluate whether sufficient tissue remains for a second treatment if necessary. It is crucial to note that not all patients are candidates for re-treatment, and this decision is made on a case-by-case basis.

Visual Stability and Follow-Up
After LASIK, patients should expect their vision to stabilize over a few weeks. If a patient notices persistent myopia or other visual issues, it is essential to communicate these concerns with the surgeon during follow-up appointments. The surgeon may recommend additional evaluations to determine if further intervention is needed.

Protective Measures Post-Surgery
Wearing protective eyewear, such as goggles while sleeping or sunglasses during the day, serves to prevent accidental rubbing of the eyes and protect against bright light, which can be uncomfortable post-surgery. While these measures are crucial in the early recovery phase, the necessity of continuous use should be discussed with the surgeon based on individual healing progress.

In conclusion, LASIK surgery is a precise and effective method for correcting vision, but it requires careful pre-operative assessment, adherence to post-operative care, and realistic expectations regarding recovery. Patients should maintain open communication with their eye care professionals to ensure the best possible outcomes.

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