PRK (Photorefractive Keratectomy) and TransPRK (Trans-Epithelial Photorefractive Keratectomy) are two variations of refractive eye surgery that share similarities but differ in their approach to vision correction. The main difference lies in how the outer layer of the cornea, called the epithelium, is treated during the procedure.
PRK:
In traditional PRK, the epithelium is completely removed before reshaping the underlying corneal tissue with a laser. The removal of the epithelium allows direct access to the cornea for laser ablation. After the procedure, the epithelium regenerates naturally over a period of a few days to a week.
TransPRK:
TransPRK, also known as “No-Touch PRK,” employs advanced laser technology to remove the epithelium and reshape the cornea without manual scraping or alcohol application. The entire procedure, including epithelial removal and laser ablation, is performed using a laser. The laser ablates the epithelium and corrects the underlying cornea in a single step. The epithelium is then left to regenerate naturally over time, similar to PRK.
Key Differences:
1. Epithelial Removal: In PRK, the epithelium is manually scraped off the cornea, while in TransPRK, the laser is used to remove the epithelium without physical contact, resulting in a “no-touch” approach.
2. Enhanced Precision: TransPRK offers greater precision and control as the entire procedure, including epithelial removal and laser ablation, is performed using a laser, reducing the risk of variability associated with manual scraping.
3. Recovery Time: Both PRK and TransPRK involve the regeneration of the epithelium. However, TransPRK may potentially have a slightly faster recovery time since the laser ablation and epithelial removal are integrated into a single step.
4. Suitability: TransPRK may be considered for individuals with thinner corneas or those who are not suitable candidates for traditional PRK due to certain corneal conditions or characteristics. The laser’s ability to precisely control the epithelial removal process can offer advantages for certain patients.
It’s important to note that the suitability of PRK or TransPRK depends on various factors, including individual eye conditions, corneal thickness, and surgeon recommendation. Consulting with an experienced eye surgeon will help determine the most appropriate procedure for your specific needs.
