For specified z0, find such a distance z and beam quality M2 at which the wavefront ROC keeps its previously calculated value. + sign is for the far zone, - is for the near zone.

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Assigning either real or imaginary part of complex beam parameter, we define both the beam radius w and the wavefront ROC R at the same time.

For specified waist radius w0, find such a distance z and beam quality M2 at which the wavefront ROC keeps its previously calculated value.

Procedures such as LASIK and PRK take place only on the surface of the eye to reshape the cornea and correct refractive errors. At Brinton Vision, these particular procedures are laser-based, further reducing direct human contact with the delicate ocular tissue. Naturally, this precision carries miniscule risk.

The placement of an intraocular lens (IOL) is a different animal. Due to the fact that this procedure involves removing the natural lens and replacing it with a manmade version, this is done manually by the surgeon and involves opening the eye, therefore, inherently creating more opportunities for complications.

Find beam quality parameter M2 giving specified beam radius at the same axial distance z and with the same waist radius w0.

Custom LensXpress

LASIK, plus all of its modern alternatives are among the safest, most effective surgical procedures ever known. There are millions of vision correction procedures performed around the world each year, yet patient satisfaction is somewhere north of 96 percent and complications are rare. In fact, after thousands of surgeries, the doctors at Brinton Vision have seen very few complications relating to this surgical procedure. So, is custom lens replacement surgery (formerly called refractive lens exchange) safe? You bet!

Lock front - find such values of free parameters at which the wavefront ROC R and the beam radius w at some axial distance z stay constant when one of the parameters changes.

In the unlikely event that you develop an infection, retinal detachment or other complication, know that your Brinton Vision doctor is well equipped to diagnose, treat or provide referrals to ensure the best treatment from any complication you may experience. Vision loss from ocular surgery complications is very rare.

Eye irritation/Dryness. Most patients experience eye irritation and scratchiness following lens replacement. This can last a few days, a few weeks or even a few months, but it typically resolves over the course of time! Your doctor will provide you with multiple strategies, including eyedrops to ease symptoms and aid in healing.

Dr. Jason P. Brinton is an internationally recognized specialist in the field of LASIK and refractive surgery. He is a graduate of Harvard College, earned his medical doctorate from the Harvard Medical School and is board certified by the American Board of Ophthalmology.

Lock waist - find such values of free parameters at which the beam waist w0 stays constant when one of the parameters changes.

Redness. Sometimes patients notice small, red blotches on the white part of their eyes after RLE. They can be unsightly—even scary-looking—but they are not dangerous. These will gradually fade over the course of approximately 7-10 days.

Changing of real part is equivalent to changing of wavefront ROC R, and changing of imaginary part is equivalent to changing of beam radius w.

Lens replacement is safe and effective for those who qualify, and complications are rare. However, it’s important to know that lens in general, the higher the refractive error—especially with myopia—the greater the risk of retinal detachment a patient naturally has. Other risks include swelling, inflammation, infection and visual disturbances such as glares and halos.

For specified Vs, find such a distance z and beam quality M2 at which the wavefront ROC keeps its previously calculated value.

The FDA is not responsible for approving medical procedures. In fact, there is currently no government or private entity that directly regulates or approves surgical procedures. However, the FDA does regulate the devices used in lens replacement, including the lenses, laser equipment, surgical supplies, medications, and more. The doctors, surgeons and medical staff must also work within the laws and regulations that govern all health care workers.

So, while custom lens replacement surgery (refractive lens exchange) and other lens replacement procedures are not FDA-approved, everything involved with the lens procedure must meet their high standards and safety provisions.

How to find z: substitute z0 as w0/Vs into formulas for w(z) and R(z), express w0 from both, equate them and solve against z.

Although eye surgery is safe, it is not totally without the risk of complications. We would be remiss if we didn’t have a real discussion about the most common risks associated with custom lens replacement and other lens replacement procedures. But don’t fret—we’ll also give you easy ways to reduce your own chances of complications!

As with any surgical procedure, you can mitigate your own risk by following the detailed post-operative instructions given to you as you heal. The Brinton Vision medical staff will send you home with your post-surgical instructions plus medications you’ll need for proper healing. Instructions may include, but are not limited to:

There is only slightly more risk with custom lens replacement surgery than with PRK or LASIK, and most complications are not a direct result of the surgery itself. Patients who experience certain complications—difficulties that go beyond the usual side effects—should call their doctor for follow-up care. Some complications are as follows

The tool Gauss Beam Calculator computes some free parameters of the Gaussian beam when changing one of its parameters and fixing some others. As it is not possible to make all the parameters to be free, we introduce two fixing modes called Lock waist and Lock front.

Quadratic equations have two solutions and we have to define a way to point out which solution to take. So the tool has one additional parameter - zone - which can be Near zone or Far zone.

Certain minor side effects are common after an IOL procedure. Most are not considered complications and are nothing to worry about. If ever concerned about your progress, please reach out to the Brinton Vision medical team to ensure your healing is on track.  The common side effects following a custom lens replacement (refractive lens exchange) procedure include:

Fuse lenses

The U.S. Food and Drug Administration has a variety of important duties. First and foremost, this federal agency is responsible for the regulation of more than 6,000 medical devices used and sold in the United States. Additionally, the FDA conducts numerous trials to test the safety of medical devices and drugs, and grant approval for their use in patients.

Vision fluctuations/disturbances. Most patients experience visual disturbances of some kind after lens replacement surgery—glares and halos, starbursts and blurred vision. Nighttime vision can be difficult in the first weeks with the new lenses but typically resolve over the first few months.. If the problem worsens or continues for longer than expected, consult with your experienced Brinton Vision doctor.

How to find z: express w02 from formula for R(z), substitute the expression into formula for w(z) and solve it against z.