Photorefractive keratectomy using a 213 nm wavelength solid-state laser in eyes with previous conductive keratoplasty to treat presbyopia: Early results

Abstract

Photorefractive keratectomy after CK using a 213 nm wavelength solid-state laser produced functional visual acuity in presbyopic patients in the short term (6 months).

Long-Term Followup of LaserIn SituKeratomileusis for Hyperopia Using a 213 nm Wavelength Solid-State Laser

“…The combination of an extremely small spot (0.6 mm), a uniform intensity beam distribution, a fast pulse rate, and an ultrafast tracking/scanning system contribute to the accuracy of this laser system [11]. The fact that the 193 nm laser system is more sensitive to corneal hydration and environmental humidity is also well known.…”

“…It has been shown to create a smoother ablation surface by the accurate transfer of energy onto the corneal stroma [8–11]. A smaller spot size of 0.6 mm, which is 2.5 times smaller than a typical excimer laser spot size, contributes less mechanical stress on the cornea causing less damage to the corneal structure [8, 12].…”

First Clinical Results of a New Generation of Ablative Solid-State Lasers

“…Furthermore, based on the work of Hale and Querry on extinction coefficients of radiation over a large area of the electromagnetic spectrum, Dair and co-workers found less absorption of up to two orders of magnitude for solid-state lasers in Balanced Salt Solution (BSS) and 0.9% Sodium Chloride solution compared to an excimer system [ 19 , 20 ]. While for excimer lasers emitting at 193 nm, tissue hydration control was found to be crucial to achieve target ablation [ 21 , 22 , 23 ], solid-state ablation lasers emitting at longer wavelengths would offer the benefits of being less dependent on the hydration state of the cornea and the humidity of the surgical environment, as well as not using toxic gas and operating silently [ 24 , 25 , 26 , 27 , 28 ].…”

Fabrication of novel bundled fiber and performance assessment for clinical applications

“…Clinical laser application has been studied and employed in various medical fields, such as surgical treatment (photorefractive keratectomy, laser lithotripsy, laser prostatectomy, dental cavity treatment, and cosmetic surgery ) and diagnostic imaging (optical coherence tomography, photoacoustic imaging, and NIR imaging ). Particularly, endoscopic surgical procedures with lasers often require application of optical fibers in order to precisely deliver optical energy to the target tissue and to minimize any adverse injury to the peripheral region.…”