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An eye with a distorted cornea due to keratoconus
Topography-guided PRK is a type of laser vision correction that leverages the power of advanced mapping technology to create a precise and comprehensive three-dimensional map of the cornea. This map, known as a topography, provides a detailed representation of the cornea’s surface and shape, allowing the PRK surgeon to tailor the laser correction to the individual needs of each patient.
In comparison, traditional LASIK is based on the patient’s eyeglass prescription, which provides only a general understanding of the cornea’s shape and fails to take into account the many subtle variations and imperfections that can impact vision. With topography-guided LASIK, the laser correction is guided by the comprehensive topography map, which includes thousands of data points providing a more effective and personalized approach to vision correction. This approach results in a sharper vision and lowers the incidence of side effects like glare and haloes.
The first step in topography-guided PRK is the creation of a topography map of the cornea. This is done using a corneal topographer, a device that projects light patterns onto the cornea and records the reflection of these patterns using cameras. The information gathered is then used to create a highly detailed map of the cornea’s shape and surface. Dr. Cohen uses the most advanced topographer called the “Topolyzer” for this purpose. Unlike other topographers, this device was designed specifically for topography-guided PRK.
Once the topography map is complete, the PRK procedure begins. The cornea is gently ablated using an excimer laser to remove small amounts of tissue and reshape the cornea. Unlike LASIK, PRK does not require the creation of a flap in the cornea, making it an ideal option for those who are not suitable candidates for LASIK due to a thin cornea or other factors.
The laser correction is guided by the topography map, ensuring that the treatment is customized to the specific needs of each patient. Dr. Cohen uses the Allegretto 500 Wavelight device for this purpose. This is one of the most advanced laser platforms today and works flawlessly with data provided by the “Topolyzer”. The healing period is typically 4-7 days, but it may take up to a few weeks to realize the full visual benefit.
Dr. Sapna Parikh reports on the very first case of an ICL in New York performed by Dr. Ilan Cohen.
The surgeon, Dr. Ilan Cohen talks about “the unique” features of Implantable Collamer® Lens surgery as compared with LASIK.
Speak to your eye care provider about topography-guided PRK to see if this is a good option for you.