Advanced Surface Ablation
What Is Advanced Surface Ablation?
ASA works by using a cool laser beam to reshape the cornea, the clear front window of your eye. The laser removes microscopic amounts of tissue in a precise pattern determined by your prescription. This reshaping allows light to focus properly on the retina at the back of your eye, creating clearer vision.
By correcting the way light enters your eye, we can reduce or eliminate common focusing errors. The entire process is computer-guided for accuracy and safety.
We most commonly use ASA to treat nearsightedness, farsightedness, and astigmatism. Nearsightedness makes distant objects appear blurry, while farsightedness can blur close-up tasks like reading.
- Nearsightedness, also called myopia
- Farsightedness, also called hyperopia
- Astigmatism caused by an irregular corneal shape
- Some combinations of these conditions
ASA is similar to a procedure called PRK but uses newer techniques and technology. Both ASA and PRK remove the outer layer of corneal cells and reshape the tissue beneath, unlike LASIK which creates a hinged flap. The main advantage of ASA over LASIK is that it leaves more of your cornea intact, making it safer for people with thinner corneas or certain jobs.
Recovery from ASA takes longer than LASIK because the surface layer needs to regrow. However, the final visual results are typically equivalent between the procedures.
Several variations of surface ablation exist, and we choose the best method based on your individual eye anatomy. The differences mainly involve how we remove or prepare the epithelium before laser treatment.
- PRK removes the epithelium mechanically or with a laser
- LASEK loosens cells with dilute alcohol before removal
- Epi-LASIK uses a special blade to separate the epithelium
- TransPRK removes the epithelium with the same laser that reshapes the cornea
Who Is a Good Candidate for ASA?
ASA works best for low to moderate prescriptions, though advances in laser technology have expanded the treatable range. We evaluate your specific prescription to ensure ASA can safely correct your vision.
Generally, candidates have prescriptions within certain limits that our eye doctor will review during your consultation. People with very high prescriptions may need alternative treatments.
Your corneas must be thick enough to withstand reshaping while maintaining structural integrity. We measure corneal thickness during your pre-surgical evaluation using specialized instruments. ASA actually preserves more corneal tissue than LASIK because we do not create a flap.
- Corneas must meet minimum thickness standards
- No active eye infections or inflammation
- Stable corneal shape without progressive thinning
- Healthy tear production to support healing
We generally recommend ASA for adults whose vision has remained stable for at least one year. Most surgeons prefer candidates to be at least 18 years old, though the ideal age may vary based on your eye development.
If your prescription keeps changing, surgery might not provide lasting results. Our eye doctor will review your prescription history to confirm you are ready for ASA.
ASA is particularly well-suited for people in careers with high physical demands or risk of eye trauma. Military personnel, law enforcement officers, athletes, and firefighters often choose ASA because there is no corneal flap that could be dislodged by impact.
- Jobs requiring physical contact or combat training
- Contact sports with risk of eye injury
- Outdoor work in dusty or dirty environments
- Careers where LASIK flap complications could be problematic
Certain health conditions can interfere with healing or increase complication risks. We carefully review your medical history before recommending ASA.
- Autoimmune diseases that affect healing
- Uncontrolled diabetes with poor blood sugar management
- Pregnancy or nursing, which can temporarily change your prescription
- Keloid scarring tendency or wound healing problems
- Certain medications that affect immunity or healing
What to Expect Before Your ASA Procedure
Your pre-operative evaluation includes detailed testing beyond a standard eye exam. We measure not only your prescription but also the unique characteristics of your eye that guide laser programming. This appointment typically takes one to two hours.
We also check for any eye diseases or conditions that might affect your surgical outcome. These thorough measurements ensure the safest and most accurate treatment possible.
We use advanced technology to create a detailed three-dimensional map of your cornea. This mapping, called topography or tomography, reveals subtle irregularities in corneal shape and thickness.
- Corneal topography shows the front surface curvature
- Pachymetry measures corneal thickness at multiple points
- Wavefront analysis detects higher-order optical imperfections
- Pupil size measurement in different lighting conditions
Contact lenses can temporarily change your corneal shape, which would make our measurements inaccurate. We ask you to stop wearing contacts for a specific period before your evaluation and surgery. Soft lenses typically require one to two weeks of discontinuation, while rigid gas-permeable lenses may need three to four weeks.
During this time, you should wear your glasses full-time. Accurate measurements are essential for successful outcomes, so following this instruction carefully is important.
Some medications can increase bleeding or affect healing, so we review your complete medication list before surgery. Our eye doctor will tell you which medicines to stop and for how long.
- Blood thinners unless medically necessary and approved by your prescribing doctor
- Aspirin and anti-inflammatory drugs for several days before
- Certain herbal supplements that affect clotting
- Medications that cause dry eyes when safer alternatives exist
You cannot drive yourself home after ASA because of the numbing drops and protective contact lens placement. Plan to have a responsible adult drive you to and from your procedure. You should also arrange time off work, typically several days to a week depending on your job demands.
Your eyes will be sensitive and your vision blurry in the initial recovery period. Planning ahead for transportation and rest helps ensure a smooth healing process.
The ASA Procedure Step by Step
On the day of surgery, we begin by placing numbing drops in your eyes so you will not feel pain during the procedure. These anesthetic drops work within a few minutes. We also clean the area around your eyes and position you comfortably under the laser.
A small device gently holds your eyelids open so you do not need to worry about blinking. You remain awake throughout the procedure and can communicate with our surgical team.
The first surgical step involves removing the thin epithelial layer that covers your cornea. Depending on the specific ASA technique we use, this removal may be done with a gentle instrument, dilute alcohol solution, or the laser itself.
- The epithelium is only a few cells thick
- Removal is painless due to the numbing drops
- This layer will naturally regrow within a few days
- Different techniques may be chosen based on your eye characteristics
Once the epithelium is removed, we activate the excimer laser to reshape your cornea. The laser delivers cool ultraviolet light pulses that precisely remove microscopic tissue amounts. You will hear clicking sounds and may notice an odor during treatment, both of which are normal.
We ask you to look at a fixation light during the laser application. Modern eye-tracking technology adjusts for any small movements to ensure accurate treatment.
After laser reshaping is complete, we place a special soft contact lens on your eye. This bandage lens protects the healing surface and improves comfort as your epithelium regrows. The lens typically stays in place for three to five days.
You will not remove this lens yourself. Our eye doctor will take it out at your first follow-up appointment once the epithelium has sufficiently healed.
The actual laser treatment lasts less than one minute per eye, though the entire procedure takes about 15 to 30 minutes for both eyes. Most of this time involves preparation and positioning rather than the laser application itself.
- Preparation and numbing drops take several minutes
- Epithelium removal takes one to two minutes per eye
- Laser reshaping takes 10 to 60 seconds per eye
- Bandage lens placement takes about one minute per eye
Recovery and Healing After ASA
The first three to four days after ASA involve the most discomfort as your epithelium regrows. Your eyes will feel irritated, watery, and sensitive to light. Vision will be quite blurry during this initial period, which is completely normal.
Most people find their comfort improves significantly once the epithelium has healed and we remove the bandage contact lens. Planning quiet rest time during these first days helps you cope with the temporary discomfort.
We prescribe pain medication and anti-inflammatory eye drops to manage discomfort after ASA. Over-the-counter pain relievers may also help, and we may recommend these in addition to prescription medications. Keeping your eyes closed and resting in a dark room can reduce light sensitivity.
- Take prescribed pain medication as directed
- Use artificial tears frequently for comfort
- Wear sunglasses outdoors and in bright light
- Avoid screens and reading when eyes feel strained
- Apply cool compresses if recommended by our eye doctor
You will receive several types of eye drops after ASA, including antibiotics to prevent infection, anti-inflammatory drops to control healing, and lubricating drops for comfort. Following the exact schedule is important for optimal healing. We will provide written instructions showing when and how often to use each drop.
Always wash your hands before applying drops, and avoid touching the dropper tip to your eye or any surface. If you are unsure about your drop schedule, contact our office for clarification.
Your eyes are vulnerable during the healing period, so protection is essential. We may recommend wearing protective shields while sleeping to prevent accidental rubbing. Avoiding water exposure, makeup, and dusty environments helps prevent infection and irritation.
- Wear eye shields at night for the first week
- Avoid swimming, hot tubs, and getting water in your eyes for at least two weeks
- Do not wear eye makeup for one to two weeks
- Stay out of dusty, smoky, or dirty environments
- Avoid rubbing or touching your eyes
Vision improvement after ASA happens gradually rather than overnight. Most people notice clearer vision within the first week, but full stabilization can take several weeks to months. Fluctuations in clarity are normal during healing as the corneal surface smooths and any haze resolves.
By one month, many patients have functional vision for daily activities. Final best vision may continue to improve for three to six months as the cornea completes its remodeling process.
Regular follow-up visits allow us to track your healing progress and address any concerns. Your first appointment is typically one to three days after surgery to remove the bandage contact lens and check epithelial healing. Additional visits occur at one week, one month, three months, and six months.
These appointments include vision testing, eye pressure measurement, and examination of your corneal surface. Attending all scheduled visits helps ensure any issues are caught and managed early.
Potential Complications and Warning Signs
Some discomfort, tearing, and light sensitivity are expected after ASA. However, certain symptoms require immediate medical attention. We want you to understand the difference so you know when to call our office.
- Normal: Gritty sensation, watering, and mild to moderate pain in the first few days
- Normal: Blurry vision and glare around lights initially
- Concerning: Severe pain not relieved by prescribed medication
- Concerning: Sudden vision loss or significant worsening
- Concerning: Increasing redness, discharge, or swelling
A small percentage of patients develop corneal haze, a clouding that can affect vision clarity. Mild haze is common and often resolves on its own, but significant haze may require additional treatment with steroid drops. Our modern surgical techniques and post-operative medications have greatly reduced haze rates compared to older methods.
Delayed healing of the epithelium occurs occasionally, especially in people with dry eyes or certain health conditions. We monitor healing closely at your follow-up visits and adjust treatment if regrowth is slower than expected.
Infection after ASA is rare but serious. The bandage contact lens and antibiotic drops we prescribe help prevent this complication. Contact our office immediately if you develop warning signs of infection.
- Increasing eye pain rather than improving pain
- Yellow or green discharge from the eye
- Increasing redness that spreads
- Fever or feeling unwell
- Vision that suddenly becomes much worse
Sometimes the initial treatment does not achieve the exact intended result, leaving you slightly nearsighted or farsighted. Under-correction is more common than over-correction. Most of these small residual refractive errors are well within functional ranges.
If your vision does not meet your goals after healing is complete, we may recommend an enhancement procedure. This second laser treatment fine-tunes your correction and is typically performed at least three to six months after your initial ASA. Not everyone is a candidate for enhancement, so we evaluate each situation individually.
Frequently Asked Questions
ASA typically involves more discomfort than LASIK during the first few days of recovery because the entire epithelial surface must regrow. However, the procedure itself is painless with numbing drops, just like LASIK. Most patients manage the post-operative discomfort well with prescribed medications and find the temporary symptoms worthwhile for the long-term benefits and increased corneal stability.
Driving is usually possible within three to seven days when vision clears enough to meet legal standards and comfort improves. Return to work depends on your job requirements. Desk work might be feasible within a week, while jobs with heavy physical demands, dust exposure, or critical vision needs may require one to two weeks off. We provide individual guidance based on your specific occupation and healing progress.
If you are over 40 and have presbyopia, the age-related loss of near focusing ability, you will likely still need reading glasses for close-up tasks even after ASA. The procedure corrects your distance prescription but does not prevent or reverse presbyopia. Some patients choose monovision correction, where one eye is set for distance and the other for near vision, though this approach is not suitable for everyone.
Rubbing your eyes during the healing period can disrupt epithelial regrowth and potentially cause irregular healing. The bandage contact lens provides some protection, but forceful rubbing should still be avoided. If you accidentally rub your eyes, contact our office so we can examine you and ensure no damage occurred. This is why we provide protective shields for nighttime wear when unconscious rubbing is more likely.
Enhancement procedures are possible if you have sufficient remaining corneal thickness and your eyes are otherwise healthy. However, if vision changes are due to age-related conditions like cataracts or presbyopia progression, enhancement may not be the best solution. We evaluate whether your vision change is treatable with additional laser surgery or whether other approaches would be more appropriate for your situation.
Getting Help for Advanced Surface Ablation (ASA)
If you are considering ASA or have questions about your candidacy, scheduling a comprehensive consultation with our eye doctor is the first step. We will evaluate your eyes, discuss your vision goals, and help you understand whether ASA or another vision correction option best fits your needs. For existing patients experiencing symptoms during recovery, our office is available to address concerns and ensure your healing stays on track.