scholarly journals Transepithelial Phototherapeutic Keratectomy Using a 213-nm Solid-State Laser System Followed by Corneal Collagen Cross-Linking with Riboflavin and UVA Irradiation

2010 ◽  
Vol 2010 ◽  
pp. 1-3 ◽  
Author(s):  
George D. Kymionis ◽  
Michael A. Grentzelos ◽  
Alexandra E. Karavitaki ◽  
George A. Kounis ◽  
Georgios A. Kontadakis ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Solid State ◽  
Laser System ◽  
Solid State Laser ◽  
Cross Linking ◽  
State Laser ◽  
Phototherapeutic Keratectomy ◽  
Uva Irradiation ◽  
Collagen Cross Linking ◽  
Corneal Collagen

Purpose. To present a case of a keratoconic patient who underwent epithelial removal with transepithelial phototherapeutic keratectomy (t-PTK) using a 213-nm solid-state laser system followed by corneal collagen cross-linking (CXL) with riboflavin and ultraviolet-A (UVA) irradiation.Methods. Case report.Results. A twenty-four-year-old male with keratoconus underwent CXL treatment after epithelial removal with t-PTK using a solid-state laser system. No intra- or early postoperative complications were found. One month postoperatively, uncorrected visual acuity (UCVA) improved from 20/63 to 20/32 while best spectacle- corrected visual acuity (BSCVA) improved from 20/40 to 20/25. Corneal topography revealed a significant improvement which remained stable during the six-month followup period.Conclusions. Epithelial removal with t-PTK before CXL could improve patient's visual outcome.

Long term results of accelerated corneal collagen cross-linking in pediatric keratoconus

2021 ◽  
pp. 112067212110183
Author(s):  
Yasin Cinar ◽  
Cagla Cilem Han ◽  
Alparslan Sahin ◽  
Zeba A Syed
Keyword(s):  
Visual Acuity ◽  
Corneal Thickness ◽  
University Hospital ◽  
Long Term Results ◽  
Cross Linking ◽  
Distance Visual Acuity ◽  
The Mean ◽  
Collagen Cross Linking ◽  
Corneal Collagen

Purpose: To evaluate the long term visual, refractive, and corneal tomographic outcomes of epithelium-off accelerated corneal collagen cross-linking (ACXL) in the management of pediatric keratoconus (KC). Methods: This retrospective study included patients under 18 years old with progressive KC who underwent ACXL between 2012 and 2019 at Dicle University Hospital. Complete ophthalmic examination was performed including uncorrected distance visual acuity (UDVA), best spectacle-corrected distance visual acuity (CDVA), manifest refraction, and corneal tomography. Evaluations were performed preoperatively and at 6 months intervals postoperatively. Results: Forty-nine eyes of 49 patients were included in the study. The mean age of patients at the time of ACXL was 14.2 ± 1.8 (range: 9.5–17.3) years. Mean follow up was 4.61 ± 1.90 (range: 2.0–8.1) years. The mean LogMAR UDVA improved from 0.94 ± 0.41 to 0.81 ± 0.43, 0.69 ± 0.41, and 0.67 ± 0.33 after 1, 3, and 5 years respectively ( p = 0.001). The mean LogMAR CDVA improved from 0.58 ± 0.36 to 0.46 ± 0.31, 0.34 ± 0.23, and 0.39 ± 0.27 after 1, 3, and 5 years respectively ( p = 0.015). The mean refractive cylinder improved significantly from 6.01 ± 2.07 diopters (D) to 5.46 ± 1.87, 5.38 ± 2.18, and 5.02 ± 2.31 D after 1, 3, and 5 years respectively ( p = 0.005). As compared to preoperative values, steep keratometry and maximum keratometry were not significantly different ( p = 0.805 and 0.448, respectively) following ACXL, while flat keratometry significantly improved after ACXL ( p = 0.012). Although central corneal thicknesses decreased significantly ( p = 0.029), the decrease in thinnest corneal thickness was not statistically significant ( p = 0.205). Conclusion: Epithelium-off ACXL seems to be effective for halting KC progression with long term clinical benefits in pediatric patients.

Combined Transepithelial Phototherapeutic Keratectomy and Corneal Collagen Cross-Linking for Progressive Keratoconus

Ophthalmology ◽  
2012 ◽  
Vol 119 (9) ◽  
pp. 1777-1784 ◽  
Author(s):  
George D. Kymionis ◽  
Michael A. Grentzelos ◽  
George A. Kounis ◽  
Vasilios F. Diakonis ◽  
Aliki N. Limnopoulou ◽  
...  
Keyword(s):  
Cross Linking ◽  
Phototherapeutic Keratectomy ◽  
Collagen Cross Linking ◽  
Corneal Collagen

Pinhole Design of Spatial Filter in High Energy Solid-State Laser System

2010 ◽  
Vol 47 (11) ◽  
pp. 111402 ◽  
Author(s):  
张鑫 Zhang Xin ◽  
刘红婕 Liu Hongjie ◽  
赵军普 Zhao Junpu ◽  
袁强 Yuan Qiang ◽  
代万俊 Dai Wanjun ◽  
...  
Keyword(s):  
Solid State ◽  
Laser System ◽  
Spatial Filter ◽  
High Energy ◽  
Solid State Laser ◽  
State Laser

scholarly journals Clinical Outcomes of LASIK Using a 213 nm Solid-State Laser System: 6-month Follow-up

2009 ◽  
Vol 50 (6) ◽  
pp. 826
Author(s):  
Tae Hyung Lim ◽  
Chul Young Choi ◽  
Myoung Joon Kim ◽  
Jae-Yong Kim ◽  
Hungwon Tchah
Keyword(s):  
Solid State ◽  
Clinical Outcomes ◽  
Laser System ◽  
Solid State Laser ◽  
State Laser

All-solid-state laser system for the generation of tunable femtosecond light pulses in the vacuum UV down to 172.7 nm

1995 ◽  
Author(s):  
Frank Seifert ◽  
Jens Ringling ◽  
Frank Noack ◽  
Olaf Kittelmann ◽  
Valentin P. Petrov
Keyword(s):  
Solid State ◽  
Laser System ◽  
Solid State Laser ◽  
State Laser ◽  
Light Pulses ◽  
Vacuum Uv

scholarly journals Solid state heat capacity disk laser

1998 ◽  
Vol 16 (4) ◽  
pp. 605-625 ◽  
Author(s):  
G.F. Albrecht ◽  
S.B. Sutton ◽  
E.V. George ◽  
W.R. Sooy ◽  
W.F. Krupke
Keyword(s):  
Heat Capacity ◽  
Solid State ◽  
Active Medium ◽  
Conceptual Design ◽  
Scaling Laws ◽  
Waste Heat ◽  
Laser System ◽  
Solid State Laser ◽  
State Laser ◽  
Laser Head

This paper describes a solid state laser concept that scales to MW levels of burst power and MJ of burst energy and burst durations measured in seconds. During lasing action, waste heat is purposely stored in the heat capacity of the active medium. The paper outlines the principal scaling laws of key operational features and arrives at a conceptual design example of the laser head as well as a mobile laser system.

1 kHz solid state laser system for the generation of 50 fs pulses tunable in the visible

1996 ◽  
Vol 131 (1-3) ◽  
pp. 195-202 ◽  
Author(s):  
M. Sueptitz ◽  
R.A. Kaindl ◽  
S. Lutgen ◽  
M. Woerner ◽  
E. Riedle
Keyword(s):  
Solid State ◽  
Laser System ◽  
Solid State Laser ◽  
State Laser

Baseline design of proposed AWE 100-TW solid state laser system

1999 ◽  
Author(s):  
John A. McMordie ◽  
Thomas H. Bett ◽  
P. C. Morris ◽  
M. J. Mead ◽  
B. R. Thomas
Keyword(s):  
Solid State ◽  
Laser System ◽  
Solid State Laser ◽  
Baseline Design ◽  
State Laser

High power all solid state laser system near 280 nm

2006 ◽  
Vol 84 (3) ◽  
pp. 371-373 ◽  
Author(s):  
A. Friedenauer ◽  
F. Markert ◽  
H. Schmitz ◽  
L. Petersen ◽  
S. Kahra ◽  
...  
Keyword(s):  
Solid State ◽  
High Power ◽  
Laser System ◽  
Solid State Laser ◽  
State Laser
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