scholarly journals Visual Outcomes of the FemtoLASIK Technology Using Excimer Lasers with Frequency More 1000 Hz in Low to Moderate Myopia Correction

2021 ◽  
Vol 18 (1) ◽  
pp. 46-53
Author(s):  
A. V. Doga ◽  
I. A. Mushkova ◽  
A. N. Karimova ◽  
E. V. Kechin ◽  
A. E. Kopylov
Keyword(s):  
High Frequency ◽  
Laser Surgery ◽  
Functional Results ◽  
Excimer Lasers ◽  
Ophthalmological Examination ◽  
Corneal Curvature ◽  
Visual Outcomes ◽  
Operative Data

Purpose: to evaluate the clinical and functional results of the operation the FemtoLASIK by excimer lasers with frequency more 1000 Hz in patients with low to moderate myopia.Patients and methods. The 84 eyes of 84 patients with low to moderate myopia who had undergone FemtoLASIK procedure using with excimer lasers: Schwind Amaris 1050 Hz (Germany) and Microscan Visum 1100 Hz (Russia) were included in the study. The “Schwind Amaris 1050 Hz” and “Microscan Visum 1100 Hz” groups were comparable in terms of pre-operative data (age, sex, corneal curvature, central thickness of the cornea, sphere, cylinder, SE) (p > 0.05). All patients underwent complete ophthalmological examination before refractive laser surgery, and also patients were examined on the 1st day and 1 month after FemtoLASIK.Results. One month postoperatively, in the “Schwind Amaris 1050 Hz” group the UDVA 1.0 or better (20/20 or better by Snellen) was achieved in 100 %, in the “Microscan Visum 1100 Hz” group — in 100 % (p > 0.05). There wasn’t observed a loss of the CDVA lines in both groups. In the “Schwind Amaris 1050 Hz” group gain of one or more lines of the CDVA was 14 %, in the “Microscan Visum 1100 Hz” group — in 12.2 % (p > 0.05). In the “Schwind Amaris 1050 Hz” group the predictability of targeted refraction within ±0.5 D was in 90.7, within ± 1.0 D — in 100 %, in the “Microscan Visum 1100 Hz” group — in 90.2 % and 100 %, respectively (p > 0.05).Conclusions. The FemtoLASIK procedure using with different high-frequency excimer lasers is an effective, safe and predictable method for correcting low to moderate myopia. 

scholarly journals Supralaryngeal tubeless combined high-frequency jet ventilation for laser surgery of the larynx and trachea

1999 ◽  
Vol 83 (6) ◽  
pp. 940-942 ◽  
Author(s):  
G. Ihar ◽  
C. Hieber ◽  
C. Schaberning ◽  
P. Karincuk ◽  
S. Adel ◽  
...  
Keyword(s):  
High Frequency ◽  
Laser Surgery ◽  
Jet Ventilation ◽  
High Frequency Jet Ventilation

Single-Axis Projection Scheme for Conducting Sequential Lateral Solidifica-tion of Si Films for Large-Area Electronics

2001 ◽  
Vol 685 ◽  
Author(s):  
Alexander Limanov ◽  
Vladimir Borisov
Keyword(s):  
Pulse Duration ◽  
High Frequency ◽  
Excimer Lasers ◽  
Melting Line ◽  
Large Area ◽  
Technical Challenge ◽  
Projection Scheme ◽  
Different Types ◽  
Si Films ◽  
Projection Optics

AbstractThis paper deals with some results of research in SLS performed in the excimer laser laboratory of TRINITI research institute, Russia, where different types of excimer lasers have been developed and manufactured. The research used a new simple SLS approach based on single-axis (i.e., cylinder) projection optics. The method employs a long single melting line extended many centimeters in length. The line is formed by projection through a single slit in a bulk metal mask. Some aspects of the efficiency, potential, and technical challenge of the method are discussed. This method is particularly useful with low pulse energy and high frequency excimer lasers, and one of the most efficient ways of providing directionally crystallized Si films over a large area. Several types of excimer lasers were tested for the SLS technique. It was found that among various parameters, pulse duration is a more important one, e.g., an increase in pulse duration from 25 to 150 ns results in enlargement of lateral growth distance by about three times.

Visual outcomes in adult amblyopic eyes with moderate myopia after corneal laser surgery versus copolymer phakic intraocular lens implant

2015 ◽  
Vol 41 (11) ◽  
pp. 2513-2523 ◽  
Author(s):  
Felix Gonzalez-Lopez ◽  
Nuria Alonso-Santander ◽  
Blas Mompean ◽  
Rafael Bilbao-Calabuig ◽  
Jose A. Calvache ◽  
...  
Keyword(s):  
Intraocular Lens ◽  
Laser Surgery ◽  
Phakic Intraocular Lens ◽  
Visual Outcomes

scholarly journals Evaluation of CO2 Laser Surgery for Early Carcinoma Larynx

2011 ◽  
Vol 2 (3) ◽  
pp. 125-129
Author(s):  
Vijay K Sharma ◽  
Ajith Nilakantan
Keyword(s):  
Laser Surgery ◽  
Tertiary Care ◽  
Major Complication ◽  
Functional Results ◽  
Laryngeal Edema ◽  
Care Hospital ◽  
Patient Acceptability ◽  
Carcinoma Larynx ◽  
Significant Difference ◽  
Malignant Lesions

ABSTRACT Objective To evaluate the effectiveness of transoral endoscopic laser surgery in the treatment of early laryngeal cancers in comparison to external radiotherapy. Method: The patients included in the study were those who reported to the ENT department of a tertiary care hospital with early malignant lesions of the larynx. Result Our study revealed a local recurrence rate of 15% in the radiotherapy arm but only 10% in the CO2 laser arm; however, this difference was not statistically significant. The only parameter in the analysis of voice which showed a statistically significant difference between the two arms was roughness which was better in the radiotherapy arm at 6 months. The major complication following transoral CO2 laser surgery was persistent hoarseness which was seen in six patients and it resolved completely on continuation of conservative measures. Severe laryngeal edema following treatment was seen in two patients. Statistically significant difference was noted in patient acceptability in favor of CO2 laser. Conclusion Endoscopic CO2 laser surgery in early laryngeal cancer leads to similar control of the disease as with the traditional methods, with better patient acceptability, low morbidity and good functional results.

scholarly journals Long-Term Followup of Patients with Active J-Reservoirs after Restorative Proctocolectomy for Ulcerative Colitis with regard to Reservoir Function, Mucosal Changes, and Quality of Life

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Ola Røkke ◽  
Knut Iversen ◽  
Torill Olsen ◽  
Sølvi-May Ristesund ◽  
Geir Egil Eide ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Ulcerative Colitis ◽  
Restorative Proctocolectomy ◽  
High Frequency ◽  
Functional Results ◽  
Favourable Result ◽  
Life Questionnaire ◽  
Calprotectin Level ◽  
Mucosal Changes

Objective. Study the functional results and mucosal changes in the ileal pouch after restorative proctocolectomy with J-reservoir for ulcerative colitis. Material and Methods. Followup study of 125 patients with J-reservoir with one disease-specific- and one general (SF-36) quality of life-questionnaire, rectoscopy with biopsies, and stool samples to evaluate inflammation, dysplasia, presence of Helicobacter pylori and calprotectin level. Results. Fourteen J-reservoirs were removed or deactivated, leaving 111 patients for followup. The followup time was 6.8 (1–15) years. 87.4% of the patients were satisfied. 93.1% had some kind of functional restriction: food- (75.5%), social- (28.9%), physical- (37%) or sexual restriction (15.3%). 18.6% had often or sometimes faecal incontinence. Low daytime faecal frequency was associated with good quality of life. 13 patients (12.6%) had a less favourable result. There was no pouch-dysplasia. Calprotectin levels were increased in patients with visible pouch inflammation or history of pouchitis. HP was diagnosed by RUT in 42.3%, but was not associated with inflammation or pouchitis. Conclusions. Most patients were satisfied with the J-reservoir in spite of a high frequency of various restrictions. 12.6% (13 patients) had a less favourable functional result, partly due to a high frequency of defecations, pain, pouchitis and inflammation.

scholarly journals Complex Approach to the Bacterial Corneal Ulcers Treatment

2020 ◽  
Vol 17 (4) ◽  
pp. 796-803
Author(s):  
E. V. Yani ◽  
V. A. Golikova
Keyword(s):  
Corneal Ulcer ◽  
Treatment Time ◽  
Functional Results ◽  
Control Group ◽  
Ophthalmological Examination ◽  
Entire Treatment Period ◽  
Corneal Ulcers ◽  
Results Of Treatment ◽  
Group 2 ◽  
Corticosteroid Drugs

Purpose: Objective: to evaluate the effect of treatment of bacterial corneal ulcers of varying severity using a combination of antibacterial and corticosteroid drugs.Material and methods. 63 patients with bacterial corneal ulcers of varying severity were treated. The study used a quantitative scale to assess the severity of corneal ulcers. Group 1 — patients with mild corneal ulcers (18 patients); Group 2 — patients with moderate corneal ulcer (17 patients); group 3 — severe corneal ulcer (11 patients); control group — patients with mild corneal ulcer (17 patients). Patients of groups 1, 2 and 3, in addition to the conventional treatment, received Dexamethasone 0.1 % — 0.3 ml in parabulbar injections from the first day of treatment for the entire treatment period. Kr). In addition to the standard ophthalmological examination, all patients were assessed for the ulcer defect using measurements on OCT-POG accessing the parameters of the diameter of the corneal ulcer (d) and the depth coefficient (Kr).Results. The patients in the 1st group received antibacterial treatment and the addition of parabulbar injections of a corticosteroid drug (Dexamethasone). It allowed to decrease the treatment time and the period of hospitalization, promoted faster epithelialization and a reduction in the depth of the ulcer, less coarse scarring of the cornea, allowed to increase the functional results of treatment. The proposed treatment for severe corneal ulcers in 55 % of cases allows to use only conservative treatment. It is possible to obtain moderate opacity with vascularization in 60 % cases, which contributes to the preservation and/or improvement of visual acuity, despite the severity of the inflammatory process without the use of surgical intervention.Conclusion. The proposed treatment, involving the use of the corticosteroid drug Dexamethasone 0.1 % in parabulbar injections of 0.3 ml once daily for a bacterial corneal ulcer of mild severity for, average, 15.0 ± 1.4 days, a bacterial corneal ulcer of moderate severity — 18.0 ± 1.3 days, severe bacterial corneal ulcer — 25.0 ± 4.4 days, seems to be effective if the proposed parameters of the diameter and depth of the corneal ulcer are controlled. 

scholarly journals Comparative Analysis of the Efficiency, Safety, Predictability of Wavefront-Guided and Conventional FemtoLASIK Procedures in Low to Moderate Myopia

2018 ◽  
Vol 15 (2S) ◽  
pp. 189-196
Author(s):  
A. V. Doga ◽  
I. A. Mushkova ◽  
A. N. Karimova ◽  
E. V. Kechin ◽  
A. G. Guliev ◽  
...  
Keyword(s):  
Computer Program ◽  
Efficiency Index ◽  
Standard Group ◽  
Ophthalmological Examination ◽  
Spherical Equivalent ◽  
Corneal Curvature ◽  
Safety Index ◽  
Exact Test ◽  
Significant Difference ◽  
Conventional Algorithm

Purpose: to evaluate the effectiveness, safety, and predictability of the wavefront-guided FemtoLASIK using the Platoscan computer program and data from the KR-1W aberrometer, in comparison with the conventional algorithm FemtoLASIK in patients with low to moderate myopia.Patients and methods. There were 62 eyes of 62 patients with low to moderate myopia who had undergone FemtoLASIK procedure using an excimer laser ‘Microscan Visum” (Russia) and a femtosecond laser Femto LDV Z6 (Switzerland) in the study. In the “Wavefront” group which included 31 eyes with a mean spherical equivalent (SE) -=3,32 ± 1,23 D (M ± SD) was performed a wavefront-guided Femtosecond LASIK using aberrometer KR-1W (Japan) and a program for calculating the operation’s parameters “Platoscan” (Russia). “Standard” group included 31 eyes with an average SE –3.51 ± 1.21 D (M ± SD), who received the conventional FemtoLASIK. The “Wavefront” and “Standard” groups were comparable in terms of pre-operative data (age, sex, corneal curvature, central thickness of the cornea, sphere, cylinder, SE) (p > 0.05). All patients underwent complete ophthalmological examination before refractive laser surgery, and also patients were examined on the 1st day and 1 month after FemtoLASIK.Results. One month postoperatively, in the “Wavefront” group the UDVA 1.0 or better (20/20 or better by Snellen) was achieved in 93.5%, in the “Standard” group — in 96,8% (p > 0.05). There wasn’t observed a loss of the CDVA lines in both groups. In the “Wavefront” group, gain of one or more lines of the CDVA was in 38.7%, in the “Standard” group — in 12.9% (p = 0.04, Fisher’s exact test). In the “Wavefront” group the predictability of targeted refraction within ±0.5 D was in 93.5%, within ±1.0 D — in 100%, in the “Standard” group — in 90,3 and 100%, respectively (p > 0.05). The efficiency index in the “Wavefront” group was 1.00 (1.00; 1.20) (Me (Q25; Q75)), in the “Standard” group — 1.00 (1.00; 1,00) (Me (Q25; Q75)) (p > 0.05). The safety index in the “Wavefront” group was 1.00 (1.00; 1.20) (Me (Q25; Q75)), in the “Standard” group — 1.00 (1.00; 1,00) (Me (Q25; Q75)) (p > 0.05).Conclusions. The FemtoLASIK procedure, performed according to the conventional and wavefront-guided algorithms using the “Platoscan” computer program and data from the KR-1W aberrometer, is an effective, safe and predictable method for correcting low to moderate myopia, there is no statistically significant difference between two algorithms (p > 0.05). 

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