PRK Laser Eye Surgery

PRK – Photo-Refractive Keratectomy differs from LASIK in that the Excimer laser is applied directly to the corneal surface to smoothly reshape this surface and correct the refractive error.

PRK involves the manual removal of the most superficial layer of the cornea (the epithelium) or using the laser to directly remove the epithelium (TEMLA), before the laser correction begins.  The underlying corneal tissue surface is then re-shaped with the Excimer laser.  After the surgery, a contact lens is placed over the eye to assist with healing and comfort.

The surface epithelial layer heals over several days to cover the treated area and grows to the new shape.  Some discomfort can occur during this healing process.  Vision may be blurred until the epithelium has regrown, usually within 4 to 7 days.  Further improvement typically continues over several weeks.

Corneal haze (scarring) is a significant side effect with PRK as the eye heals; haze can cause or exacerbate symptoms such as regression, glare and haloes. However, PRK continues to be an effective, safe treatment for low refractive errors.  The higher the refractive error, the greater the potential for scarring with PRK.

LASEK – Laser Assisted Epithelial Keratomileusis LASEK is a slight modification to the PRK procedure. After the Excimer laser treatment, the thin layer of epithelium is placed back into position and a contact lens applied to assist with healing and comfort levels. This treatment has slightly longer healing times than PRK and is now rarely performed.  Results were identical to PRK.

TEMLA – Trans-Epithelial Minimal Laser Ablation is a futher modification to PRK.  The Excimer laser is applied directly to “vaporise” the surface epithelium before the laser reaches the permanent layer of the cornea (the stroma).  Unfortunately, the epithelium is not of uniform thickness and visual results are more variable due to the less precise stromal ablation.  Although still occasionally used, this technique has largely been abandoned except for damaged, scarred corneas.

ASLA – Advanced Surface Laser Ablation is another word for standard PRK. In the 1990’s, the original broad beam lasers were replaced by “new technology” flying spot lasers.  All modern excimer lasers now use flying spot techniques.

Health care is expensive, that’s why many families cannot order the medicines they need. There are different conditions when men prefer purchase medications from online pharmacy. US citizens get millions varied medicines online. For example Xylocaine causes loss of feeling in an area of your body. Given during surgery. Moreover treats emergency core rhythm problems. Cialis is used to treat few types of health problems. What about dosage for cialis and sexual problems? Apparently every man has heard at least slightly about cialis for daily use dosage. The definition of erectile disfunction the persistent inability to maintain an erection to the point of orgasm, influence an estimated 15 to 30 millions men in the United States only. Today for men of any age, it can be first sign for severe complaints, so it’s essential for your overall health, not just your sex living, to see a health care professional if you experience erection dysfunction. Why it happen? What kinds of professionals treat sexual diseases in men? What is the most significant information you would like to know know about this? Ususally patients using this generic mostly do not have potentially serious side effects to Cialis. Store the generics away from excess heat. For example the liquid medicaments for preference have to be kept in the refrigerator, but other may be stored at room temperature.