How does Refractive Surgery work?
Presbyopia treatment usually involves glasses or contact lenses.Some people opt for refractive surgery options.
Refractive surgery
Aberrometry is used to profile the eye in a three-dimensional map.
Surgeons can then remove tissue eg by excimer laser ( Current treatment parameters: Myopia 0.50 diopters to 12.00 diopters
Hyperopia 0.50 diopters to 6.00 diopters
Astigmatism 0.50 diopters to 6.00 diopters )
Surgeons can then remove tissue eg by excimer laser ( Current treatment parameters: Myopia 0.50 diopters to 12.00 diopters
Hyperopia 0.50 diopters to 6.00 diopters
Astigmatism 0.50 diopters to 6.00 diopters )
or adjusting the curvature to compensate)
The Excimer laser utilizes a 193 nm argon-fluoride beam to reshape the anterior corneal stroma by breaking collagen bonds and expelling or ablating corneal tissue with each laser pulse. It is termed a “cold” laser because the collagen bonds are broken without damaging adjacent cells.
Femtosecond Laser is a High-frequency laser sweeping back and forth (raster) pattern creates a horizontal, then vertical cleavage plane to create the flap.
Astigmatic Keratotomy (AK) Incisional surgical procedure used to correct corneal astigmatism.
Automated Lamellar Keratoplasty (ALK) Tissue is removed under a corneal flap
Conductive Keratoplasty (CK) is a non-ablative, collagen-shrinking procedure for the treatment of mild and moderate hyperopia.
Epi-LASIK separates an epithelial sheet without a flap
Intrastromal Corneal Ring Segments (ICRS)
A reversible procedure used in the treatment of low amounts of myopia (-1.00 to -3.00 D) by placing rings of polymethylmethacrylate (PMMA) in the midperipheral corneal stroma to flatten the radius of curvature.
A reversible procedure used in the treatment of low amounts of myopia (-1.00 to -3.00 D) by placing rings of polymethylmethacrylate (PMMA) in the midperipheral corneal stroma to flatten the radius of curvature.
Keratomileusis
The sculpting of the cornea, formerly done with a lathe and blade, now done with an excimer laser.
The sculpting of the cornea, formerly done with a lathe and blade, now done with an excimer laser.
Keratoplasty is replacement of the cornea. Keratoplasty can be lamellar (replacement of the superficial layers) or penetrating (transplantation or replacement of the full thickness of the cornea).
Keratotomy is a surgical incision of the cornea.
Laser-Assisted In Situ Keratomileusis (LASIK) is a combination of two refractive technologies: Use of a microkeratome, to create a thin flap of tissue (approximately 130 to 180 microns thick) followed by excimer laser ablation to reshape the stromal tissue beneath the flap.
Laser Epithelial Keratomileusis (LASEK) is used to preserve the corneal epithelium. LASEK treats the epithelium with alcohol to loosen and separate it from the stroma and it is then rolled back.
Laser Thermal Keratoplasty (LTK) uses a Holmium:YAG laser comprised of a slit-lamp delivery system that creates spots around the circumference of the peripheral cornea.