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Choosing PRK involves more than learning how the procedure changes your vision. It is also reasonable to ask what technology will be used during treatment and how that technology is customized to your eyes. The laser must reshape the cornea according to your prescription and measurements while remaining accurately positioned during the procedure.
At Modern Vision Centers, PRK treatment uses the WaveLight EX500 excimer laser along with eye tracking, iris registration, detailed diagnostics, and different treatment profiles. Understanding how these technologies work can help you feel more informed before your EyeAnalysis in Des Moines.
Modern Vision Centers uses the WaveLight EX500 excimer laser for the corneal reshaping portion of PRK. According to the practice, this system can refine vision with accuracy down to 0.25 microns.
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During PRK, an excimer laser removes very small amounts of corneal tissue according to a treatment plan created from your eye measurements. The laser applies the correction in a carefully calculated pattern rather than reshaping the cornea randomly. Modern Vision Centers states that the actual laser treatment takes approximately 10 seconds per eye.
The amount of tissue removed depends on the correction being treated. The American Academy of Ophthalmology explains that a typical treatment removes approximately 12 microns of tissue for each diopter of nearsightedness across a 6 millimeter treatment zone. That means a 4 diopter correction could involve approximately 48 microns of tissue removal at the center. The small scale of the correction makes accurate laser delivery important.
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Modern Vision Centers
6880 EP True Pkwy Suite 110, West Des Moines, IA 50266
(515) 674-2020
Website: https://www.mvcvision.com/prk/
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Best PRK Surgeon Des Moines
Best PRK Surgeon Des Moines
Excimer laser technology has been used for PRK for decades. EyeWiki notes that the FDA approved excimer laser use for PRK in 1995. Before treatment begins, your measurements are used to determine the correction programmed into the laser.
Keeping the laser treatment centered is another important part of the technology. Modern Vision Centers uses iris registration and eye tracking to monitor the position of the eye during treatment.
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Iris registration uses the unique features of your iris as a reference for alignment, while the tracking system monitors eye movement. EyeWiki describes eye tracking and iris registration as technologies that help maintain appropriate positioning of the laser treatment.
You are still asked to look toward a light during the procedure, but you do not have to keep your eye perfectly motionless on your own. According to the practice, the overall procedure takes approximately five minutes per eye, with the tracking technology operating during treatment.
The FDA also explains that patients undergoing laser vision correction are generally instructed to look at a target light. Being able to maintain your gaze is part of the procedure, although the tracking system is designed to account for normal small eye movements. The FDA notes that someone unable to stare at a fixed object for at least 60 seconds may not be an appropriate candidate for laser eye surgery.
Modern Vision Centers offers two PRK treatment profiles, known as wavefront optimized and Contoura topography guided, according to the practice. Both are performed using the WaveLight EX500, but they use different types of information to determine how the cornea should be treated.
A wavefront optimized treatment is designed around the patient's prescription while accounting for the optical characteristics of the eye. Contoura uses detailed corneal topography to create a treatment based on the individual surface characteristics of the cornea.
The American Academy of Ophthalmology's EyeNet magazine describes topography guided treatment as a way of measuring the unique peaks and valleys across the cornea and using that information to help normalize its shape. It may be considered in certain cases involving corneal irregularities, including some stable causes of irregular astigmatism. However, topography guided treatment is not appropriate for every corneal condition, including keratoconus and other forms of ectasia.
That is why the treatment profile cannot be selected simply because one sounds more advanced. Your surgeon needs to consider your corneal measurements, prescription, eye health, and other findings before determining which approach is appropriate.
The laser can only work from the information used to create its treatment plan. At Modern Vision Centers, that process begins with an EyeAnalysis that includes diagnostic testing such as corneal mapping and refraction.
Corneal mapping provides detailed information about the shape and surface of the cornea. Refraction testing establishes the prescription that needs to be corrected. Together with the rest of your examination findings, these measurements help the surgical team determine how your PRK treatment should be planned.
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This diagnostic stage also helps identify conditions that could affect whether laser vision correction is appropriate. The American Academy of Ophthalmology notes that corneal topography can help detect keratoconus before treatment is considered.
Contact lens wear can affect corneal measurements, so it is important to follow the instructions Modern Vision Centers provides about discontinuing contacts before your EyeAnalysis. Allowing your eyes to return to their normal shape can help the team obtain measurements that accurately represent your corneas.
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