Patients often come to our eye care center in Pune, India, and ask us “How do I know if I need Laser Eye Surgery?” The short answer is, if you are experiencing a refractive error. Refractive errors are caused by rays of light entering the eye that are not able to focus precisely on the retina.
THE COMMON REFRACTIVE ERRORS ARE
A myopic eye is longer than normal and the cornea is steeper, so the light rays focus in front of the retina. This causes close objects to look clear but distant objects appear blurred.
Hyperopia causes are typically genetic. A hyperopic eye is too short and the cornea is too flat, so the rays of light focus behind the retina. This causes distant objects to look clear but near objects appear blurred.
ASTIGMATISM (DISTORTED VISION)
The incoming light rays are unable to focus at a common point within the eye. This causes distorted or blurred vision for both near and far objects. S normal cornea is round and smooth. With astigmatism, the cornea curves more in one direction than in the other. Astigmatism can occur in combination with myopia or hyperopia.
PHOTO REFRACTIVE KERATECTOMY (PRK )
Performed with an excimer laser to reshape the cornea. Corrects mild to moderate myopia by removing tiny amounts of tissue from the outer surface. The procedure uses a computer to map the eye’s surface & calculate how much tissue to remove PRK takes only a few minutes.
LASER EPITHELIAL KERATOMILEUSIS (LASEK)
LASEK surgery combines the benefits of LASIK & PRK to treat astigmatism, nearsightedness, or farsightedness. The procedure uses an excimer laser to reshape the cornea, properly focusing light on the retina.
wavefront guided lasik is advanced method for measuring optical distortions in the eye
wavescan can be used to evaluate the eye before surgery. this technology lets a lasik surgeon adjust the laser beam settings for more precise procedure
RELEX (REFRACTIVE LENTICULE EXTRACTION )
RELEX “FLEX”(FEMTOSECOND LENTICULE EXTRACTION)
RELEX “SMILE”(SMALL INCISION LENTICULE EXTRACTION)
|ReLEx SMILE||BLADELESS and FLAPLESS
2 mm incision surgery hence least post operative care
Inadvertent eye rubbing is allowed
Very fast recovery time
Patient having Less corneal thickness can also be treated
Plus number (Hyperopia) at present (May 2016)
|Bladeless Femto Customvue Lasik||Very precise, bladeless flap hence recovery is fast. Treats astigmatism/ high cylindrical power and plus number
|Flap precautions are to be taken care like no rubbing till flap is stable.|
|Customvue Blade Lasik||Gives personalized treatment to eye by treating highest degree of corneal abnormality (abbrations).
Very precise as it has IRIS REGISTRATION technology which register your eye and notice even a micro movement hence laser firing is on target area always.
|Not recommended when corneal thickness is less
Flap precautions are to be taken care like no rubbing till flap is stable.
|Photo refractive keratotomy
|When the shape of cornea is not normal. No flap. Variants – LASEK, Epi-Lasik, ASA||Work resume after 15 days. return of some spectacle number is possible. Eye drops used for longer duration|