N. Timothy Peters, MD
Christopher Turner, OD
Lauren McLoughlin, OD

Clear Advantage Vision Correction Center
155 Borthwick Avenue
Suite 200 East
Portsmouth, New Hampshire 03801

(603) 501-5000
(866) 30-CLEAR toll free
(866) 302-5327

N. Timothy
Peters, MD

Turner, OD

McLoughlin, OD


Femtosecond Laser

Clear Advantage Vision Correction Center is the FIRST and ONLY center in Northern New England offering an "all-laser," blade-free LASIK procedure. In fact, the DaVinci Femtosecond laser is one of the newest, and most advanced bladeless lasers on the market today.


To provide our patients with the most technologically advanced vision correction options in New England. Our highly experienced surgical staff is dedicated to educating patients on a variety of refractive procedures.

Our surgeon, Dr. N. Timothy Peters has performed over 15,000 LASIK surgeries to date and is considered one of the most experienced and highly respected refractive surgeons in New England.

STEP ONE – Evaluating your eye

With advanced diagnostic tools, Clear Advantage can quickly and accurately determine your candidacy for LASIK surgery. The Orbscan IIz corneal topographer is used to measure the eye, mapping out its dimensions by gathering over 9,000 points of data for the most accurate measurement. A Zywave aberrometer is also used to measure vision errors, including those that cause night vision problems and other forms of light sensitivity. The data obtained by these two high-quality wavefront measuring systems allows our surgeon to review your candidacy for LASIK based not only on your level of nearsightedness, farsightedness and astigmatism, but also on your personal higher order aberration profile, which determines how your eyes respond to light in both the daytime and nighttime. If the surgeon finds that you are a candidate, these tests will also help the surgeon determine which laser correction procedure is the most accurate treatment for correcting your individual vision errors. At Clear Advantage, our surgeons offer LASIK (both traditional and bladeless), advanced LASIK with the MEL80 laser platform by Zeiss and customized LASIK procedures.

STEP TWO – The LASIK Procedure
Creating the Corneal Flap

The first step in vision correction is to create a thin flap in the cornea. In order to correct vision, it is necessary to expose the corneal layer beneath the surface, called the stroma. This is where the Bausch and Lomb excimer laser will do its work in reshaping the cornea. Traditionally, the corneal flap was produced by using a mechanical device to create a hinged flap on the corneal surface. The surgeon folds it gently back for treatment, and replaces it afterwards. LASIK procedures have very few complications, but typically, when there is a complication, it is related to that small flap and how it was cut. The traditional device used to cut the flap is called a microkeratome, which is attached to the eye with a suction ring. It has a very precise, sharp blade that creates an accurate flap. Dr. N. Timothy Peters has performed more than 11,000 procedures using the microkeratome and has tremendous success. However, as with any mechanical device, there is a remote possibility of an imperfect incision. These rare complications are usually corrected within a few months, after the patient has healed, with a different procedure.


The DaVinci femtosecond laser by Ziemer (www.Ziemergroup.com) solves the flap complication problem by using an extraordinarily fast and precise flap creation procedure. Use of the DaVinci femtosecond laser gives you a safer and more precise vision correction procedure. A femtosecond is a quadrillionth of a second, and this is the speed of each DaVinci laser pulse. Rather than having a blade cut the corneal flap, the DaVinci uses a fast, pulsated laser to create many microscopic bubbles just below the corneal surface. The laser moves back and forth over the designated treatment area on the eye, and creates a round, shallow area of these tiny bubbles. Then your eye surgeon can use a special instrument to gently lift that tissue and fold it back out of the way.

The DaVinci laser emits a very low-density series of pulses to do this, and is controlled by our surgeon, following your treatment plan. It is pre-determined exactly how deeply the laser will penetrate, so as not to affect the stroma, where the excimer laser will work. Such subtle control is not possible with a microkeratome.


The DaVinci laser allows the ultra-precise creation of thinner and more evenly shaped corneal flaps than ever possible with a mechanical microkeratome. This allows for a more uniform surface for your excimer laser treatment and potentially better results. The safety profile of femtosecond lasers have been demonstrated in over one million cases, and it is widely accepted as a significantly safer procedure than with the microkeratome. Another great comfort to patients is knowing that the DaVinci laser creates the corneal flap by using two million tiny bubbles linked in rows. In the unlikely event that something goes wrong during the flap creation, the surgeon will allow the patient to safely absorb the bubbles, and simply start over. It is almost a "no-harm, no-foul" concept!

Because of the enhanced safety record of femtosecond lasers, the U.S. Army, Navy, Air Force, and Marine Corps have all approved, and strongly recommend, its use for their personnel. NASA has also approved it for astronauts, who work under physically stressful conditions in space.

Shortened Recovery Time, Improved Night Vision with Advanced LASIK using the Zeiss MEL80 System

As the first and only practice in New England to use the precise Zeiss MEL80 System, Clear Advantage offers patients an advanced form of LASIK using an ultra-fast eye tracker for the finest visual corrections of the cornea. This procedure is significantly shorter than other LASIK procedures and results in a faster recovery time and an improved visual outcome, especially in dim-light and at night.

Customizing the Laser Treatment with the Zyoptix® Personalized Laser Vision Correction System

Zyoptix® is the very latest development in laser eye treatment from Bausch and Lomb. With greater assurance and a vision correction procedure that is truly personalized to detect and correct the unique errors in your vision, Zyoptix® truly brings LASIK to a higher level.

Among the Fastest Treatments

With a faster treatment, the technology used at Clear Advantage allows for the latest in LASIK with less anxiety. In fact, the LASIK procedure performed at Clear Advantage is among the fastest treatments available in the United States. In conjunction with the highly predictable results provided by precision diagnostic tools, this increased speed helps provide a greater assurance with the best possible result.

  • Additionally, Clear Advantage utilizes one of the fastest eye trackers in the United States, which means the laser compensates for any inadvertent eye movement during the procedure

Clear Advantage Vision Correction Center

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LASIK (Laser Assisted In-Situ Keratomileusis)

LASIK combines the proven techniques of both corneal flap and excimer laser surgery, resulting in dramatic results and rapid visual recovery. LASIK is effective for correcting most cases of nearsightedness, farsightedness and astigmatism. Generally, a traditional LASIK candidate would have a fairly small prescription without a significant amount of astigmatism. In addition, traditional LASIK would not improve higher order aberrations. (An example of higher order aberrations is glare and halos at night).

PRK (Photorefractive Keratectomy)

PRK is a safe, viable alternative to LASIK for many patients. Clear Advantage uses the same Technolas 217z excimer laser to perform PRK and LASIK, and our pre-operative evaluation is identical as for LASIK including the use of Zywave wavefront-sensing technology. During PRK, the top layer of the cornea is gently removed to prepare the eye for treatment. PRK uses a dilute alcohol solution to loosen the epithelium prior to removal. The excimer laser is then used to re-sculpt the shape of the cornea, reducing your refractive error in the same fashion as is done after flap creation with LASIK. Anesthetic drops are used, which numb the eye, making the actual procedure painless.

Advanced LASIK with the MEL80 by Zeiss

This bladeless LASIK procedure uses one of the fastest lasers in the world, the MEL80 by Zeiss, to provide the finest corrections on the cornea, while at the same time maintaining its round contour. This leading-edge treatment, which also uses an ultra-fast eye tracker, allows for an improved visual outcome and a quicker recovery time due to the eye having a shorter amount of laser exposure than in other procedures.

ZYOPTIX customized LASIK

The very latest development in laser eye treatment from Bausch and Lomb is a system called Zyoptix. Zyoptix means that LASIK treatment is now unique to each eye. With Zyoptix, treatment is designed to treat your specific vision errors. Each Zyoptix treatment involves an extra screening process to allow the surgeon to understand each patient's specific visual needs. Zyoptix is ideal for patients with larger prescriptions, large pupils or heavy astigmatism. Zyoptix patients note improved driving ability at night with reduced or eliminated glare and halos (higher order aberrations).


Monovision generally involves correcting one eye for a vision defect, such as presbyopia, to provide reading or intermediate vision in one eye, and correcting the other eye for distance vision. Monovision can be achieved through eye surgery or traditional means, such as contact lenses.The brain plays a role in monovision by "selecting" the appropriate image needed for near or far vision, while filtering out the "blurred" image. Not everyone adapts well to two different vision corrections at the same time and the adjustment may take time. To make sure monovision works for you, your eye doctor may recommend that you try contact lenses with monovision correction first before you make the more permanent decision of electing to have monovision eye surgery.

Even if you have a LASIK monovision treatment, you still may require extra correction from eyeglasses in certain circumstances, such as night driving to make sure your vision is appropriately sharp. In addition, you may find that "middle" distance fields, such as a computer, lose some clarity. Monovision also may adversely affect depth perception, which might be an issue for athletes or airplane pilots.

The Revolutionary Implantable Contact Lens: Visian ICL

The latest in eye surgery is the Visian implantable contact lens, or ICL, which was originally designed for patients who were not candidates for LASIK surgery due to high myopic (nearsighted) prescriptions. But the success of the Visian ICL implant has resulted in an increased interest from candidates who are considered good choices for LASIK.

The Visian ICL is an implantable collamer lens that works with the eye to correct moderate to severe nearsightedness. Unlike traditional contact lenses that are placed on the surface of the eye, the Visian ICL is positioned inside the eye between the iris and the natural lens, where it stays indefinitely. With a satisfaction rate of over 99 percent, many of our patients choose the Visian ICL to get the freedom from their contact lenses and glasses that they've always desired.

The Visian ICL is the procedure of choice for patients who need and expect higher-quality results in performance and safety. In fact, the U.S. military has embraced the Visian ICL because of the reliable visual clarity it achieves. Much like the recovery with laser vision procedures, results are immediate with the Visian ICL.

Limitations of LASIK / Advantages of an ICL

Ranges of nearsightedness: Most surgeons agree that LASIK should not be performed on anyone who has a prescription over -10.0. ICLs can be used for anyone between the ages of 18 and 45 with -5.00 to -20.00 diopters of nearsightedness.

Glare and halos: Changing the natural curve of the cornea with LASIK may induce aberrations that can lead to glare and halos in some patients. Glare and halos are less common with ICLs because they cause less aberration in the eye.

Medical contraindications: Patients with lupus, Crohn's disease, rheumatoid disease and dry eye syndrome are at a higher risk of complications with LASIK procedures, but are at minimal risk of worsening conditions after the placement of an ICL.

Why Choose Clear Advantage for Your Visian ICL Procedure?

Dr. N. Timothy Peters is the first surgeon in New Hampshire to be certified to use the Visian ICL. There have been over a quarter of a million Visian ICL procedures performed worldwide.

Clinical Trial of Visian ICL for Moderate to High Myopia: Three-Year Follow-up

The 2004 ICL clinical trial three-year follow-up reviewed by the FDA "support(s) the safety, efficacy and predictability of Visian ICL surgery to treat moderate to high myopic errors."

The three-year data, based on the assessment of 526 eyes of 294 patients, also produced the following refractive results:

  • 99 percent of patients were satisfied/very satisfied with their results.
  • 98.3 percent of patients had uncorrected visual acuity of 20/40 or better.
  • Once vision was corrected, the correction was stable and did not change over the follow-up period.
  • Additionally, the incidence of glare, halos, double vision, night vision problems and night driving difficulties remained unchanged from before surgery.


N. Timothy Peters, MD
Dr. Peters is a fellowship-trained cornea specialist and the most experienced LASIK surgeon in the Seacoast area, having performed more than 11,000 LASIK procedures. Because of his broad experience, Dr. Peters has been selected to be a clinical trainer and proctor for other refractive surgeons.

Dr. Peters has authored and/or edited multiple textbooks on LASIK and Wavefront LASIK technology, and has published multiple articles in peer-reviewed journals. He appears as a guest lecturer at numerous national ophthalmic meetings. Dr. Peters is the ONLY surgeon in the Northeast serving as a clinical consultant for Bausch and Lomb. In addition, Dr. Peters and the staff at Clear Advantage participate in a number of clinical studies on various LASIK and post-LASIK procedures. These privileges offer Clear Advantage patients some of the most advanced, up-to-date and leading edge medical technology available worldwide.

Christopher Turner, OD
Dr. Christopher Turner grew up in Manhattan, Kansas. After graduating from Kansas State University in 1996 with a Bachelor of Science degree, Dr. Turner moved to Memphis, Tennessee, to attend the Southern College of Optometry, graduating in May 2000. He is one of a select few optometrists in the Seacoast area with refractive surgery pre-operative and post-operative care experience. Having worked in a variety of optometric settings, his skill and dedication are an asset to Clear Advantage.

Lauren McLoughlin, OD
After graduating from SUNY College of Optometry, Dr. McLoughlin completed her residency in ocular disease and primary care at the VA Medical Center in Wilmington, Delaware. In addition to her training and experience in pre-operative and post-operative LASIK care, Dr. McLoughlin has practiced in a variety of optometric and ophthalmic settings and has owned two optometric practices in New Hampshire and Massachusetts.


Centrally located in Portsmouth, New Hampshire, Clear Advantage is located just two buildings down the street from Portsmouth Regional Hospital. Clear Advantage is just one hour from Boston, Massachusetts; Manchester, New Hampshire; and Portland, Maine.

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