Types of LASIK Lasers – Excimer and Femtosecond Technology
Understanding the Two Types of LASIK Lasers
The excimer laser is the technology that actually corrects your vision by reshaping the cornea. This ultraviolet laser removes microscopic layers of corneal tissue with extreme precision. Our eye doctor programs the excimer laser to match your exact prescription and corneal measurements.
Each pulse of the excimer laser removes about a quarter of a micron of tissue, which is thinner than a human hair. The laser can reshape your cornea to correct nearsightedness, farsightedness, and astigmatism in just seconds.
The femtosecond laser creates the thin corneal flap that gives our eye doctor access to the tissue underneath. This infrared laser uses ultra-fast pulses measured in quadrillionths of a second. The laser precisely separates corneal layers without using a physical blade.
Before femtosecond technology, surgeons used a handheld blade called a microkeratome to create the flap. Today, bladeless LASIK with the femtosecond laser offers greater control and customization of flap dimensions.
A complete LASIK procedure typically uses both lasers in sequence. First, the femtosecond laser creates your corneal flap. After the flap is gently lifted, the excimer laser reshapes the underlying tissue to correct your vision.
- The femtosecond laser prepares your cornea safely and predictably
- The excimer laser performs the actual vision correction
- Both lasers work together in a procedure that usually takes less than 15 minutes per eye
- Advanced computer systems coordinate the two technologies for optimal results
Earlier LASIK techniques relied on a mechanical blade to create the corneal flap. The introduction of femtosecond lasers in the early 2000s revolutionized the procedure. All-laser LASIK reduces certain flap-related complications and allows for more precise customization.
Not all LASIK centers have adopted femtosecond technology, and in some cases, blade-based LASIK may still be appropriate. We evaluate your individual eye anatomy to determine which approach best suits your needs.
How Excimer Laser Technology Works
Your cornea acts like a window that focuses light onto your retina. When the cornea has an irregular shape, light does not focus correctly, causing blurry vision. The excimer laser carefully removes tissue to change the corneal curvature and restore clear focus.
For nearsightedness, the laser flattens the center of your cornea. For farsightedness, it steepens the center. For astigmatism, it smooths out irregularities to create a more uniform surface.
Excimer lasers use a special type of ultraviolet light that breaks molecular bonds without generating heat. This cool-beam technology protects surrounding tissue from thermal damage. Each laser pulse removes tissue through a process called photoablation rather than burning.
- The laser works at the molecular level with minimal impact on nearby cells
- Cool-beam technology reduces the risk of scarring
- Your cornea experiences very little heat during treatment
- This precision helps preserve corneal strength and clarity
Modern excimer lasers can use different treatment patterns based on advanced diagnostic measurements. Wavefront-guided LASIK uses a detailed map of your unique optical imperfections, including higher-order aberrations that standard glasses cannot fix. Wavefront-optimized LASIK applies a refined treatment pattern designed to preserve the natural shape of your cornea.
Our eye doctor will recommend the approach that best matches your eye anatomy and vision goals. Both methods represent significant advances over older, standard ablation patterns.
Excimer lasers can correct a wide range of refractive errors within certain limits. The specific range depends on your corneal thickness and overall eye health. Most people with mild to moderate vision problems are good candidates for excimer laser correction.
- Nearsightedness typically up to about negative 10 to 12 diopters
- Farsightedness usually up to about positive 4 to 6 diopters
- Astigmatism generally up to about 5 to 6 diopters
- Presbyopia may be addressed with specialized treatment patterns in select cases
- Higher prescriptions may require alternative procedures
Your eyes make tiny movements constantly, even when you try to hold them still. Modern excimer lasers include sophisticated eye-tracking systems that monitor your eye position hundreds of times per second. If your eye moves beyond a certain threshold, the laser automatically pauses.
When your eye returns to the correct position, the laser resumes exactly where it left off. This technology ensures that every laser pulse lands precisely where our eye doctor intended, improving accuracy and outcomes.
How Femtosecond Laser Technology Works
The femtosecond laser creates millions of tiny, precisely placed bubbles at a predetermined depth in your cornea. These microbubbles separate the corneal layers to form a flap with smooth, clean edges. The entire flap creation process takes only seconds.
Because the femtosecond laser works at such high speed and accuracy, it can create flaps with very consistent thickness and shape. This predictability contributes to more stable vision outcomes and faster healing.
Bladeless LASIK using femtosecond technology reduces certain risks associated with mechanical blades. The laser creates flaps without the variability that can occur with handheld instruments. Many surgeons and patients prefer the added control and reproducibility of laser flap creation.
- The risk of incomplete or irregular flaps is significantly lower
- Flap complications such as buttonholes or free caps are rare
- The laser approach allows for better customization of flap dimensions
- Recovery time may be slightly faster compared to blade-created flaps
Our eye doctor can program the femtosecond laser to create a flap with specific thickness, diameter, and hinge location. Thinner flaps leave more corneal tissue available for the excimer laser correction, which is especially helpful for people with higher prescriptions. The hinge position can be adjusted based on your individual anatomy.
Standard flap thickness is typically between 90 and 120 microns, but the femtosecond laser can create flaps ranging from about 80 to 160 microns depending on your needs. This flexibility allows us to tailor your procedure for optimal safety and results.
People with naturally thin corneas may not be candidates for traditional LASIK with thicker flaps. The femtosecond laser can create thinner, more uniform flaps that preserve more tissue for the vision correction step. This expanded range of treatable patients is one of the major advantages of femtosecond technology.
Even with a thinner flap, the femtosecond laser maintains excellent flap stability and strength. We carefully measure your corneal thickness during your evaluation to determine if you have enough tissue for safe LASIK.
Your LASIK Procedure with Excimer and Femtosecond Lasers
Before your LASIK surgery, we perform comprehensive measurements of your eyes. These tests include corneal mapping, thickness measurements, pupil size assessment, and detailed refraction. The data from these tests directly programs both lasers to your unique specifications.
- Corneal topography maps the exact curve and shape of your cornea
- Pachymetry measures corneal thickness at multiple points
- Wavefront analysis captures higher-order aberrations
- Pupil measurement determines treatment zone size
- Manifest and cycloplegic refraction confirm your prescription
Your procedure begins with numbing drops to keep you comfortable. Our eye doctor places a small device on your eye to hold it gently in position for the femtosecond laser. You will feel light pressure but no pain as the laser creates your flap in about 10 to 20 seconds.
During this step, your vision may dim or blur temporarily. You will hear a rapid clicking or buzzing sound as the laser operates. After the femtosecond laser finishes, the device is removed and we move to the excimer laser.
After lifting the corneal flap, our eye doctor positions the excimer laser over your eye. You will be asked to look at a fixation light while the laser delivers your custom treatment. The excimer laser typically runs for 5 to 30 seconds depending on your prescription.
Advanced eye-tracking technology follows your eye movements to keep the treatment perfectly centered. You may notice a slight odor during this step as the laser works, and you will hear a soft clicking sound with each pulse.
Most patients feel minimal discomfort during LASIK thanks to numbing drops. During femtosecond flap creation, expect to feel gentle pressure and see your vision dim. When the excimer laser works, you will see flashing lights and possibly the fixation target.
- Neither laser causes sharp pain, though you may feel pressure or mild discomfort
- Both lasers make distinctive sounds that are normal and expected
- Your vision will be blurry immediately after the procedure
- The entire process for both eyes usually takes less than 30 minutes
The speed of modern LASIK lasers is remarkable. The femtosecond laser creates your flap in roughly 10 to 20 seconds per eye. The excimer laser correction typically takes between 5 and 30 seconds per eye, with lower prescriptions requiring less time.
While the actual laser time is brief, the full appointment includes preparation, measurements, and post-procedure instructions. Plan to spend about two hours at our office on surgery day, though your eyes are under the lasers for less than a minute total.
Choosing the Right LASIK Technology for Your Eyes
Not all eyes are the same, and not all laser platforms are identical. We evaluate multiple factors to determine the best technology for your individual case. Our recommendations are based on current evidence and our clinical experience with different laser systems.
The laser technology available at our practice meets rigorous safety standards and delivers excellent outcomes for appropriate candidates. We stay current with advances in laser technology to offer you modern, effective care.
Your corneal thickness is a critical factor in determining candidacy for LASIK and which laser approach to use. Thinner corneas benefit most from femtosecond laser flaps, which can be made thinner and more predictable than blade-created flaps. Irregular corneal shapes may require specialized treatment patterns.
- Minimum safe corneal thickness limits the amount of tissue we can remove
- Steep or flat corneas may influence treatment planning
- Existing corneal irregularities affect laser programming
- Some corneal shapes are better suited to alternative procedures
Higher degrees of nearsightedness, farsightedness, or astigmatism require more tissue removal. If your prescription is beyond the safe range for LASIK with your corneal thickness, we may recommend alternative procedures. Your lifestyle and visual demands also play a role in planning your treatment.
People with very high prescriptions might achieve better results with implantable lenses rather than laser correction. We discuss all appropriate options during your consultation to help you make an informed decision.
Certain eye conditions can influence whether LASIK is right for you and which laser approach we recommend. Dry eye disease, large pupils, thin corneas, and corneal irregularities all require careful evaluation. Some conditions may disqualify you from LASIK entirely.
- Severe dry eye may need treatment before any laser procedure
- Very large pupils can increase the risk of night vision symptoms
- History of herpes eye infections requires special precautions
- Autoimmune conditions may affect healing and outcomes
- Unstable prescriptions require waiting until vision stabilizes
Both femtosecond and excimer lasers have excellent safety profiles when used appropriately. Studies show that bladeless LASIK with femtosecond technology has slightly lower rates of certain flap complications compared to blade-based methods. However, both approaches deliver high patient satisfaction and good visual outcomes in experienced hands.
The skill and experience of your surgeon matter more than minor differences between laser brands or models. We use proven laser systems and follow best practices to maximize your safety and results.
LASIK is not suitable for everyone, even with the most advanced laser technology. We conduct thorough screening to identify any factors that could compromise your safety or results. Being honest about your health history and expectations helps us guide you to the right choice.
If LASIK is not appropriate for your eyes, we may suggest alternatives such as PRK, implantable contact lenses, or continued use of glasses or contacts. Your long-term eye health is always our priority when making treatment recommendations.
Recovery and Follow-Up After Laser LASIK
Immediately after LASIK, your vision will be blurry and your eyes may feel scratchy or watery. Many patients notice significant improvement within a few hours. We provide protective shields to wear while sleeping and prescription eye drops to support healing.
- Rest your eyes as much as possible on surgery day
- Avoid rubbing your eyes, which could dislodge the flap
- Use your prescribed eye drops exactly as directed
- Light sensitivity and mild discomfort are normal
- Most people can return to non-strenuous activities within a day or two
The precision of modern femtosecond and excimer lasers contributes to faster, more comfortable healing for most patients. The smooth edges created by femtosecond flaps typically heal with minimal inflammation. The cool-beam excimer technology reduces tissue trauma and promotes stable recovery.
Your corneal flap begins adhering within hours and continues strengthening over the following weeks. Most patients achieve functional vision within a day and near-final results within a few weeks, though complete healing can take several months.
We will see you for follow-up visits at specific intervals after your procedure. The first appointment is usually within 24 to 48 hours to check flap position and early healing. Additional visits at one week, one month, and three to six months help us track your progress.
During these appointments, we measure your vision, examine your corneas, and address any concerns. Regular follow-up care ensures that any issues are caught early and managed appropriately.
While complications after modern laser LASIK are rare, you should know when to contact us right away. Sudden vision loss, severe pain, or signs of infection require prompt evaluation. We provide emergency contact information and remain available to address urgent concerns.
- Sharp or severe eye pain that does not improve with rest
- Sudden decrease in vision or vision loss
- Increasing redness, discharge, or swelling
- Flashing lights or new floaters in your vision
- Feeling that something is seriously wrong with your eye
Frequently Asked Questions
Bladeless LASIK using femtosecond technology offers advantages for many patients, including more predictable flap creation and potentially fewer flap-related complications. However, both bladeless and blade-based LASIK can deliver excellent results in skilled hands. The best choice depends on your individual eye characteristics, your surgeon's experience, and available technology.
Most modern LASIK procedures use both a femtosecond laser to create the flap and an excimer laser to correct your vision. Some centers still use a blade for flap creation followed by excimer laser correction. We will explain exactly which technologies will be used in your procedure during your consultation.
Several reputable manufacturers produce FDA-approved femtosecond and excimer lasers for LASIK. While there are technical differences between brands, studies show that most modern laser platforms deliver similar safety and effectiveness when properly used. Your surgeon's skill, your careful candidate selection, and your individual healing response typically matter more than the specific laser brand.
You are welcome to ask about the laser technology we use and discuss any preferences or concerns. We explain the equipment in our practice and why we believe it is appropriate for your care. If you have strong preferences for specific technology that we do not offer, we can discuss whether a referral to another provider might be appropriate.
Reputable LASIK providers maintain their equipment according to manufacturer specifications and regulatory requirements. You can ask about the age of the lasers, how often they are serviced, and what software versions are in use. Modern lasers receive regular updates and calibrations to maintain optimal performance, so even equipment that is several years old can deliver excellent results when properly maintained.
Modern LASIK lasers have multiple built-in safety features and redundancies to prevent malfunctions. In the extremely rare event of equipment failure during your procedure, your surgeon will stop immediately and ensure your eye is protected. Depending on the stage of the procedure, we may complete the treatment with backup equipment, reschedule completion for another day, or take other appropriate steps to protect your vision and safety.
Getting Help for Types of LASIK Lasers - Excimer and Femtosecond Technology
If you are considering LASIK and want to understand which laser technologies are right for your eyes, schedule a comprehensive evaluation with our eye doctor. We will measure your eyes, assess your candidacy, explain the specific laser systems we use, and answer all your questions to help you make a confident, informed decision about your vision correction options.