Formerly Maida Custom Vision | Serving Northeast Florida since 1995
Formerly Maida Custom Vision | Serving Northeast Florida since 1995
The first step is a comprehensive diagnostic consultation at Florida Eye Custom Vision in Jacksonville, FL. During this appointment, we perform advanced imaging of your eyes — including corneal mapping and lens analysis — to determine whether CLR is the right procedure for you and which IOL best matches your vision goals. There is no obligation, and we will give you a complete picture of your options before any decision is made. To schedule your consultation, visit floridaeyecustomvision.com/schedule-appointment/ or call us at (904) 268-3937. Our team — formerly Maida Custom Vision, serving Jacksonville since 1995 — is here to help you find the right path to clear vision.
Yes — correcting presbyopia is one of the primary reasons patients choose CLR. As we age, the eye’s natural lens stiffens and loses the flexibility needed for near focus. This is what makes reading glasses necessary starting in your 40s. CLR removes that stiffened lens and replaces it with a premium multifocal or extended depth-of-focus IOL that can provide clear vision at multiple distances simultaneously. Most patients who choose a multifocal or trifocal IOL are able to read, use a phone, work at a computer, and drive — all without glasses. The specific IOL selected at your consultation determines your near vision outcome.
CLR uses the same technique and technology as cataract surgery — one of the most performed and extensively studied surgical procedures in the world. At Florida Eye Custom Vision, CLR is performed by Dr. Amit Chokshi and Dr. S. Akbar Hasan, who together bring decades of lens surgery experience, including Dr. Hasan’s 10 years as lead cataract and corneal surgeon at Mayo Clinic. Our team has performed more than 24,000 refractive procedures combined. As with any surgical procedure, risks exist and are discussed thoroughly at your consultation — but for appropriately selected patients, CLR has an excellent safety profile and high long-term satisfaction rates.
Most CLR patients notice meaningful vision improvement within 24–48 hours of surgery, though full stabilization typically takes 2–4 weeks as the eye adjusts to the new lens. Mild blurriness, light sensitivity, and halos around lights are common in the first few days and resolve on their own. Patients generally return to desk work and normal activities within a few days. Driving is typically cleared within a week. Each eye is treated in a separate procedure, usually a week apart. The recovery is well-tolerated by the vast majority of patients and significantly easier than many expect.
— Dr. Amit Chokshi, MD & Dr. S. Akbar Hasan, MD, Florida Eye Custom Vision
LASIK reshapes the cornea to correct vision and works best for patients under 45 with healthy corneas and no significant presbyopia. CLR replaces the eye’s natural lens and is the stronger option for patients over 45 who are already experiencing reading vision loss, or for anyone whose lens is beginning to show early changes. Because CLR eliminates the natural lens, it also corrects presbyopia in a way LASIK cannot. At Florida Eye Custom Vision, we offer both procedures — so our recommendation is always based on what your eyes need, not what we happen to offer. A diagnostic evaluation helps determine the right fit.
CLR at Florida Eye Custom Vision ranges from $9,200 to $17,200 for both eyes, depending on the intraocular lens selected. The IOL that is best suited to your vision goals and lifestyle will determine where your cost falls within that range — your surgeon will review this with you during your consultation. All CLR procedures are eligible for 0% interest financing through CareCredit over 24 months, making the investment manageable for most patients. CLR is not covered by standard vision insurance, but FSA and HSA funds can typically be applied.
The lens implanted during CLR — called an intraocular lens (IOL) — is selected based on your prescription, lifestyle, and vision goals. Options include monofocal lenses (excellent clarity at one set distance, including the Light Adjustable Lens — a monofocal IOL that can be fine-tuned with UV light treatments after surgery for a more personalized result), multifocal and trifocal lenses (clear vision at distance, intermediate, and near simultaneously), extended depth-of-focus lenses (a wide range of vision with reduced glare), and toric lenses (which correct astigmatism). The right IOL for you depends on your daily activities, how much you rely on near versus distance vision, and your tolerance for nighttime visual effects. Your surgeon will walk through the options during your consultation and help you choose the best fit.
Yes — and this is one of the most compelling reasons patients choose CLR. Cataracts form when the eye’s natural lens becomes cloudy with age. CLR removes that natural lens entirely and replaces it with a clear, permanent artificial lens. Because the artificial lens cannot cloud over, cataracts can never develop in a treated eye. For patients in their 50s who might otherwise face cataract surgery in 10–15 years, CLR effectively eliminates that future procedure and the costs that come with it. You are making one well-planned investment in your vision rather than managing a gradual problem later under less ideal circumstances.
— Dr. Amit Chokshi, MD & Dr. S. Akbar Hasan, MD, Florida Eye Custom Vision
CLR is typically best suited for patients in their 40s, 50s, and 60s who are experiencing presbyopia — the age-related loss of near focus that makes reading glasses necessary — or who have significant nearsightedness, farsightedness, or astigmatism. It is also an excellent option for patients who are not ideal LASIK candidates due to thin corneas, high prescriptions, or early lens changes. If you are over 50 and would likely need cataract surgery within the next 10–20 years, CLR may be a smarter long-term investment: you correct your vision now and eliminate the need for cataract surgery later. A comprehensive consultation determines candidacy.
Custom Lens Replacement — also called refractive lens exchange (RLE) — is a procedure that removes your eye’s natural lens and replaces it with a premium artificial lens (IOL) precisely selected to match your vision goals. The procedure itself is virtually identical to cataract surgery, with one key difference: CLR is performed before cataracts become significant, with the goal of vision correction rather than disease treatment. At Florida Eye Custom Vision in Jacksonville, FL, CLR is an option for patients over 40 who want clear distance and near vision — without glasses or contacts — for the rest of their lives.
Florida Eye Custom Vision is the only private practice in Jacksonville, FL offering LASIK, SMILE, PRK, EVO ICL, and Custom Lens Replacement under one roof — which means every patient’s evaluation considers all available options before a recommendation is made. Dr. Amit Chokshi completed his fellowship training at New York Eye and Ear Infirmary, one of the nation’s leading refractive surgery programs. Dr. S. Akbar Hasan spent a decade as Director of Laser Vision Correction at Mayo Clinic before joining our team. Together with Dr. Jerry Maida — who performed the first LASIK in Northeast Florida in 1996 — our surgical team has completed more than 24,000 refractive procedures. Formerly known as Maida Custom Vision, Florida Eye Custom Vision carries that same standard of surgical care forward. Call (904) 268-3937 or schedule a consultation online to find out if EVO ICL is right for you.
LASIK, SMILE, and EVO ICL all deliver excellent visual outcomes, but they suit different patients for different reasons. LASIK and SMILE reshape the cornea using a laser; EVO ICL adds a lens inside the eye without altering the cornea at all. LASIK treats a broad range of prescriptions including farsightedness; SMILE treats nearsightedness and astigmatism without creating a corneal flap; EVO ICL reaches prescriptions up to -20.00 and carries no dry eye risk because it does not affect the corneal nerve layer. EVO ICL is also the only reversible option among the three. At Florida Eye Custom Vision in Jacksonville, FL, all three procedures are available under one roof — so the recommendation at your consultation is always driven by what your eyes actually need.
Yes — reversibility is one of EVO ICL’s most meaningful advantages over laser procedures like LASIK or SMILE. The lens can be safely removed or exchanged if your prescription changes significantly, if a medical reason arises, or if you later choose a different procedure such as Custom Lens Replacement as part of natural aging. The removal process uses the same small incision as the original procedure. The natural lens remains untouched and corneal tissue is fully preserved throughout. While EVO ICL is designed to be a permanent, lifelong correction, the ability to reverse course offers genuine peace of mind. Drs. Chokshi and Hasan will walk through this aspect of the procedure during your consultation at Florida Eye Custom Vision.
Recovery from EVO ICL is fast for most patients. Improved vision is typically noticeable within 24 hours, and most patients return to desk work and normal daily activities within two to three days. Driving is usually permitted once vision meets legal requirements, often the day after surgery. Antibiotic and anti-inflammatory eye drops are used for several weeks to support healing. Strenuous exercise, swimming, and eye rubbing should be avoided for two to four weeks. Because EVO ICL does not create a corneal flap, there is no flap-related recovery concern that exists with LASIK. Full visual stabilization generally occurs within four to six weeks. Drs. Chokshi and Hasan schedule all post-operative appointments to monitor your recovery closely throughout the process.
The procedure takes approximately 20 to 30 minutes per eye and is performed with numbing eye drops — no general anesthesia is required. Your surgeon creates a small incision at the edge of the cornea, gently folds the EVO ICL, and positions it between the iris and the natural lens, where it unfolds and sits securely without sutures. Patients typically experience mild light sensitivity immediately after surgery and should arrange a ride home. Vision improvement is usually noticeable within hours. A follow-up exam is scheduled for the next morning at Florida Eye Custom Vision to confirm proper lens positioning and the early stages of healing.
EVO ICL is designed for patients with moderate to severe nearsightedness, correcting prescriptions from approximately -3.00 to -20.00 diopters. It also corrects astigmatism up to -4.00 diopters with the Toric ICL version. This treatment range makes EVO ICL the preferred option for patients whose prescriptions are too high for LASIK — typically above -10.00 to -12.00 — where removing enough corneal tissue would compromise structural integrity. It is important to note that EVO ICL does not correct farsightedness (hyperopia); farsighted patients may be better candidates for LASIK or Custom Lens Replacement depending on their age and anatomy. Drs. Chokshi and Hasan will determine the right path at your evaluation.
At Florida Eye Custom Vision, EVO ICL is priced at approximately $9,950 for both eyes. This includes your pre-operative evaluation, the surgical procedure itself, the custom-manufactured lens, and all follow-up appointments. Because EVO ICL is an elective procedure, it is not covered by standard vision insurance — however, 0% interest financing through CareCredit is available over 24 months, bringing the monthly cost to approximately $415. For patients with very high prescriptions who have spent years purchasing expensive contact lenses, EVO ICL frequently pays for itself within a few years. Our team is happy to walk through all financing options during your consultation.
EVO ICL has a strong and well-documented safety profile. The lens is made from Collamer, a biocompatible material that has been used in implantable eye surgery for over two decades and includes built-in UV protection. In FDA clinical trials, 99% of patients reported they would choose the procedure again. The central-port design of the EVO model eliminates the need for a pre-operative iridotomy and reduces the risk of elevated eye pressure seen with earlier ICL versions. The lens does not contact the natural lens and does not cause cataracts in appropriately selected patients. With more than two million EVO lenses implanted worldwide, the long-term safety record is extensive. At Florida Eye Custom Vision, Drs. Chokshi and Hasan review every patient’s complete ocular history before recommending EVO ICL surgery.
— Dr. Amit Chokshi, MD & Dr. S. Akbar Hasan, MD, Florida Eye Custom Vision
EVO ICL is FDA-approved for patients ages 21 to 60 — a range that was recently expanded from the previous upper limit of 45, making this procedure available to a significantly broader group of patients. Ideal candidates are nearsighted, with prescriptions typically ranging from -3.00 to -20.00 diopters, with or without astigmatism. Good candidates also have stable vision for at least one year and no history of certain eye conditions such as glaucoma or cataracts. EVO ICL does not correct farsightedness. At Florida Eye Custom Vision, Drs. Chokshi and Hasan perform a comprehensive pre-operative evaluation — including Pentacam and Sightmap imaging — to confirm candidacy before any recommendation is made.
— Dr. Amit Chokshi, MD & Dr. S. Akbar Hasan, MD, Florida Eye Custom Vision
EVO ICL (Implantable Collamer Lens) is a vision correction procedure in which a thin, flexible lens is placed inside the eye — between the iris and the natural lens — to permanently correct nearsightedness and astigmatism. Unlike LASIK, it does not reshape or remove any corneal tissue, making it an excellent option for patients with thin corneas, high prescriptions, or dry eyes that would disqualify them as LASIK candidates. The lens is also removable, giving patients flexibility if their vision needs change over time. At Florida Eye Custom Vision in Jacksonville, our surgical team offers the full spectrum of vision correction procedures — including LASIK, SMILE, and EVO ICL — so every recommendation is based on what your eyes actually need, not on what is simply available.
For the vast majority of patients, yes — and the data backs that up. Studies consistently show that 96–99% of LASIK patients achieve 20/20 vision or better. With WaveLight Plus, many of our patients achieve even better than 20/20 — sometimes sharper vision than they ever had with glasses or contacts. For Dr. Chokshi — who has had LASIK himself — the freedom from glasses and contacts in daily life and in the operating room has been worth it many times over. Most people spend $500 to $1,000 per year on contacts, solution, and eye exams. At $5,950 for both eyes with 0% financing available, LASIK pays for itself within a few years and continues delivering value for decades. The more meaningful question isn’t whether LASIK is worth it in general — it’s whether you’re the right candidate. That’s exactly what our free consultation is designed to determine.
This is one of the most important questions to ask before LASIK, and the honest answer depends on your age. LASIK corrects distance vision permanently, but it does not prevent presbyopia — the age-related condition that causes near vision to blur, typically starting in the mid-40s. If you’re in your 20s or 30s, you likely won’t need reading glasses for many years after LASIK. If you’re already in your 40s or beyond, Dr. Chokshi and Dr. Hasan will have a thorough conversation about your lifestyle and options during the consultation. In some cases, monovision LASIK — where one eye is optimized for distance and one for near — can reduce reading glass dependence. For patients over 50 with significant presbyopia, Custom Lens Replacement may be a better long-term solution than LASIK.
Yes — astigmatism is one of the most common conditions LASIK corrects, and it responds very well to treatment. Astigmatism simply means your cornea has an irregular curvature rather than a perfectly round shape. Our WaveLight EX500 excimer laser, combined with wavefront-guided mapping, precisely corrects both the degree and axis of your astigmatism in the same treatment as your nearsightedness or farsightedness. For patients with more complex or subtle corneal irregularities, our WaveLight Plus system builds a 100,000-point 3D model of your eye to deliver a treatment plan no standard LASIK system can match. SMILE is also an excellent option for patients with astigmatism who prefer a flapless procedure.
The laser treatment itself takes under 60 seconds per eye. From the time you sit in the procedure chair to the time you’re done, the entire process is typically 15 to 20 minutes for both eyes. You’ll spend more time in pre-op preparation — receiving numbing drops, a mild relaxant if desired, and final measurements — than you will under the laser. Most patients are genuinely surprised by how fast it goes. Plan for approximately two hours total at our Jacksonville facility when you factor in check-in, preparation, the procedure, and a brief post-operative review before you leave. Read a full breakdown of the LASIK procedure timeline.
The most common side effects after LASIK are temporary dry eye and mild halos or glare around lights at night, particularly in the first few weeks. These resolve on their own in the vast majority of patients as the cornea heals. Serious complications — such as infection or significant vision loss — are extremely rare, occurring in less than 1% of cases. At Florida Eye Custom Vision, our WaveLight Plus technology — available at only 30 practices nationwide — uses ray-tracing and 3D eye modeling with over 100,000 data points to reduce glare and halos more effectively than traditional LASIK systems. The most important factor in minimizing risk is proper patient selection — which is why our free consultation and advanced diagnostic evaluation exist. For patients with dry eye concerns, SMILE may be a better alternative, as it preserves more corneal nerves.
— Dr. Amit Chokshi, MD & Dr. S. Akbar Hasan, MD, Florida Eye Custom Vision
LASIK at Florida Eye Custom Vision is priced at $5,950 for both eyes. That includes your pre-operative evaluation, the procedure itself, and all post-operative visits — no hidden fees. Most vision insurance plans classify LASIK as elective and don’t cover it, but you can use FSA or HSA funds toward the cost. We also offer 0% interest financing through CareCredit over 24 months, bringing the investment to approximately $248 per month — less than most people spend on contacts and glasses each year. See our full cost and savings comparison to understand the long-term value.
Yes. LASIK is one of the most studied elective procedures ever performed, with a safety record built over 30+ years of clinical data. At Florida Eye Custom Vision (formerly Maida Custom Vision — the first practice to perform LASIK in Northeast Florida, in 1996), we use computer-guided WaveLight EX500 excimer lasers that remove tissue in increments of 39 millionths of an inch per pulse. Our surgical team has performed more than 24,000 combined procedures. Dr. Amit Chokshi — a Vanderbilt University residency graduate and fellowship-trained refractive surgeon from the New York Eye and Ear Infirmary — has had LASIK himself and brings that firsthand patient perspective to every consultation. Dr. S. Akbar Hasan spent 10 years as lead refractive and corneal surgeon at Mayo Clinic. Serious complications are extremely rare when LASIK is performed by an experienced, fellowship-trained surgical team using current technology.
LASIK is an excellent option for most adults with nearsightedness, farsightedness, or astigmatism — but candidacy depends on your corneal thickness, prescription stability, and overall eye health. At Florida Eye Custom Vision in Jacksonville, Dr. Chokshi and Dr. Hasan use advanced diagnostic technology including the Pentacam and Sightmap to evaluate each patient individually. If LASIK isn’t the right fit, alternatives like PRK, SMILE, or EVO ICL may be better suited to your eyes. Our WaveLight Plus technology also expands candidacy — some patients with subtle corneal irregularities who wouldn’t qualify for traditional LASIK may be suitable for WaveLight Plus treatment. A comprehensive free consultation is the only way to know for certain.
— Dr. Amit Chokshi, MD & Dr. S. Akbar Hasan, MD, Florida Eye Custom Vision
PRK | SMILE | EVO ICL | free consultation
Most patients notice dramatically clearer vision within 24 to 48 hours of LASIK. The day of your procedure, you’ll need a driver home and should plan to rest. The following morning, the majority of our patients return to work, drive, and resume normal activities. Full visual stabilization typically occurs within one to three months. LASIK recovery is one of the fastest of any elective surgical procedure — something Dr. Hasan emphasized frequently during his decade as Director of Laser
Vision Correction at Mayo Clinic.
No — LASIK is virtually painless. Before the procedure begins, we apply numbing eye drops so you feel nothing during the laser itself. Most patients describe a brief sensation of gentle pressure for a few seconds when the corneal flap is created. Any mild discomfort afterward typically resolves within a few hours. At Florida Eye Custom Vision in Jacksonville, FL, our surgical team — including Dr. Amit Chokshi and Dr. S. Akbar Hasan — has guided more than 24,000 patients through this process. Learn more about what to expect during and after the procedure.
Learn more about what to expect during and after the procedure
Florida Eye Custom Vision — formerly Maida Custom Vision, serving Jacksonville since 1995 — is one of the only private practices in Northeast Florida offering SMILE laser vision correction. Our office is located at 75 Jaidev Rd, St. Johns, FL 32259, conveniently accessible from the Mandarin and St. Johns areas of Jacksonville. To find out whether you are a SMILE candidate, call us at (904) 268-3937 or schedule your complimentary consultation online. Our surgical team includes Dr. S. Akbar Hasan, MD (former Mayo Clinic Director of Laser Vision Correction) and Dr. Amit Chokshi, MD, who together offer LASIK, SMILE, PRK, EVO ICL, and Custom Lens Replacement — every major vision correction option under one roof.
Florida Eye Custom Vision performs SMILE using the Zeiss VisuMax 500 femtosecond laser — the proven platform behind more than 8 million SMILE procedures performed worldwide since the procedure’s introduction. The VisuMax creates the lenticule and the small incision with exceptional precision, using low suction pressure that patients find more comfortable than older laser systems. For patients who require additional customization, our practice is one of only approximately 30 in the United States equipped with WaveLight Plus technology, which maps 100,000 data points across the corneal surface to build an ultra-precise 3D treatment plan. This level of diagnostic and treatment precision is a meaningful differentiator beyond what most SMILE practices offer.
Dry eye after LASIK is primarily caused by severing of the corneal nerves that stimulate tear production — a consequence of creating the 20mm flap. SMILE’s 2–4mm incision disrupts far fewer of these nerves. Clinical studies consistently show that SMILE patients experience significantly lower rates and severity of post-operative dry eye compared to LASIK patients. For patients who already have borderline dry eye, heavy screen use, or work in air-conditioned environments — all common in Jacksonville — this difference can be clinically meaningful. During your evaluation, our team assesses your tear film and corneal nerve health to help determine whether SMILE or LASIK is the better fit for your eyes specifically.
SMILE at Florida Eye Custom Vision is priced at approximately $5,950 for both eyes — the same price as LASIK. That fee covers your pre-operative evaluation, the procedure itself, and all follow-up care. No contact lens or glasses costs afterward. CareCredit 0% financing is available over 24 months, which works out to approximately $248 per month. SMILE is not covered by standard vision insurance, but FSA and HSA funds can be applied. Very few Florida eye surgery practices publish SMILE pricing, so we want to be straightforward: the cost is comparable to LASIK and, for the right candidate, represents a lifetime investment in clearer, more comfortable vision.
SMILE is widely considered the preferred laser vision correction option for physically active patients, military personnel, and anyone involved in contact sports. Because no corneal flap is created, there is no risk of flap displacement from a blow to the head, physical contact, or water exposure — a risk that persists indefinitely after LASIK. SMILE also preserves more of the cornea’s structural integrity, which matters for long-term biomechanical stability. Naval Hospital Jacksonville adopted SMILE for eligible active-duty service members for precisely these reasons. If you play competitive sports, train regularly, or have a physically demanding career, SMILE may be the right choice for your vision correction at Florida Eye Custom Vision.
SMILE has an outstanding safety record backed by more than 8 million procedures performed worldwide on the Zeiss VisuMax platform — the same system used at Florida Eye Custom Vision. As with any surgical procedure, risks exist: temporary dry eye symptoms, halos, glare, or mild under-correction during the healing period. Serious complications are rare. Because SMILE eliminates the corneal flap entirely, flap-related complications — which account for a meaningful percentage of LASIK adverse events — are not possible with SMILE. Our team includes Dr. S. Akbar Hasan, MD, who spent 10 years as Director of Laser Vision Correction at Mayo Clinic, and Dr. Amit Chokshi, MD, fellowship-trained at the New York Eye and Ear Infirmary. Combined, our surgeons have performed more than 24,000 refractive procedures.
— Dr. Amit Chokshi, MD & Dr. S. Akbar Hasan, MD, Florida Eye Custom Vision
Most SMILE patients notice significantly improved vision within 24 hours. Mild blurring, light sensitivity, and a slight gritty sensation are common the first day and typically resolve within 48–72 hours. We recommend taking the day of surgery and the following day off. You can return to desk work and screen use within 1–2 days, resume light exercise within a week, and contact sports within 4 weeks. Because SMILE creates no corneal flap, there is no risk of flap displacement during recovery — an advantage for active patients. Vision continues to sharpen and stabilize over the first 2–4 weeks. Your care team at Florida Eye Custom Vision will guide you through every step.
SMILE is not painful. Numbing drops are applied before the procedure, and most patients feel only mild pressure — not pain — during the treatment. The active laser time is under 30 seconds per eye. Some patients experience light sensitivity or a slight foreign body sensation for a few hours afterward, which typically resolves by the following morning. Over-the-counter comfort drops are usually all that’s needed. The absence of a corneal flap also means there is less nerve disruption overall, which contributes to a more comfortable recovery compared to LASIK for many patients.
The most important difference is that SMILE requires no corneal flap. LASIK creates a 20mm flap to access the corneal tissue beneath; SMILE uses a 2–4mm incision instead. This means SMILE preserves significantly more corneal nerve fibers — studies show roughly 80% more nerve fiber preservation compared to LASIK — which is why SMILE patients typically experience less post-operative dry eye. SMILE also offers greater corneal biomechanical stability, making it the preferred option for athletes and physically active patients. LASIK, by contrast, corrects both nearsightedness and farsightedness, while SMILE currently treats nearsightedness and astigmatism only. Our surgeons perform both and will recommend the procedure best suited to your individual eyes.
Good SMILE candidates are adults 21 or older with stable myopia (nearsightedness) up to –10.00 diopters and astigmatism up to –3.00 diopters, whose prescription has not changed significantly in the past year. You need adequate corneal thickness and healthy eyes free from conditions such as keratoconus. SMILE is especially well suited for patients with dry eye concerns, active lifestyles, or contact sports involvement — because no corneal flap means no flap-related risk. Patients who are farsighted are not candidates for SMILE; alternatives such as LASIK or Custom Lens Replacement may be appropriate. The only way to know for certain is a comprehensive evaluation.
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— Dr. Amit Chokshi, MD & Dr. S. Akbar Hasan, MD, Florida Eye Custom Vision
SMILE (Small Incision Lenticule Extraction) is a flapless laser vision correction procedure available at Florida Eye Custom Vision in Jacksonville, FL. Rather than cutting a corneal flap like LASIK, the Zeiss VisuMax laser creates a small disc of corneal tissue — called a lenticule — entirely inside the eye. The surgeon then removes this lenticule through a tiny 2–4mm incision, reshaping the cornea and correcting your vision. No flap is ever created. The entire laser portion of the procedure takes less than 30 seconds per eye, and most patients achieve clear vision within 24 hours.