scholarly journals High-frequency Coronal Discharge, Infrared Thermography and Visual Acuity Measurements of Bioelectromagnetic Influence

2021 ◽  
pp. 18-28
Author(s):  
Ignat Ignatov ◽  
Anton Antonov ◽  
Nikolai Neshev ◽  
Hugo Niggli ◽  
Chavdar Stoyanov ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Infrared Thermography ◽  
Electric Fields ◽  
High Frequency ◽  
Dispersion Analysis ◽  
Significance Level ◽  
Vision Disorder ◽  
Age Related ◽  
Coronal Discharge ◽  
The Difference

Bioelectromagnetic influence on the eyes of a group of 336 subjects with various vision disorders: amblyopia, myopia and hypermetropia were investigated with high-frequency black-white and color coronal discharge, infrared thermography and visual acuity measurements. The authors have performed registration of the biggest part of electromagnetic fields – infrared and electric fields. Positive correlation with r=0.55­0.65 at a level of significance of p<0.01 was found between the temperature change (connected with vasodilation) in the influenced areas and the average change of visual acuity (visus). In the cases without correction, Student’s t-test of visus values for both eyes before and after bioelectromagnetic influence lead to t=6.0­6.7 at significance level p<0.001 and average increase of 14.5%. In the cases of refraction amblyopia, for the difference in both eyes with correction,t was equal to 6.7­7.1 at significance level p<0.001 and the average visus was increased and was 25.5%. Concerning the correlation between the temperature difference and the effective width of the high-frequency corona discharge, it was found that r=6.0­6.7 at significance level p<0.001.The dependence of the bio effect on the stage of the vision disorder (light, medium, heavy) was investigated. A distinct regularity was found with a coefficient of correlation r ranging from ­0,35 to ­0,45 at significance level p<0,001 that the influence efficiency was highest in light disorders and lowest in heavy disorders. Single-factor dispersion analysis was performed concerning age-related dependence of the healing effect in cases of visual disorders. For the three groups: 4­-10, 11-­21 and 22­-49 years of age, we found that F=4,4­-4,6 at significance level p<0.01 corresponding to higher healing results at younger ages.

Neovaskulinės amžinės geltonosios dėmės degeneracijos gydymo ranibizumabu 24 mėnesių morfologiniai ir funkciniai pokyčiai

2015 ◽  
Vol 21 (3.2) ◽  
pp. 413-416
Author(s):  
Vilma Jūratė Balčiūnienė ◽  
Rosita Lažaunykaitė
Keyword(s):  
Visual Acuity ◽  
Macular Thickness ◽  
Age Related Macular Degeneration ◽  
Central Macular Thickness ◽  
Corrected Visual Acuity ◽  
Age Related ◽  
Before And After ◽  
The Mean ◽  
The Difference ◽  
Best Corrected Visual Acuity

Key words: ranibizumab, age-related macular degeneration, central macular thickness. Research objective. To evaluate influence of treatment with vascular endothelial growth factor inhibitor, ranibizumab, for best corrected visual acuity and central macular thickness in patients with neovascular age-related macular degeneration. Materials and methods. In this retrospective study were included treatment – naive patients. Intravitreal injections were performed at Lithuanian University of Health Sciences Kaunas Clinics Eye clinic. In this study were analysed the 24-month morphological and functional outcomes of intravitreal ranibizumab injections. Best corrected visual acuity was meassured using the Snellen chart (Landolt’s rings C optotypes). Optical coherence tomography images were obtained using the spectral – domain OCT (NIDEK RS – 3000 Advance (NIDEK CO LTD, Japan). The central thickness measurements were obtained from macular thickness maps using the digital caliper tool. Results. In this study were included 88 patients. Best corrected visual acuity before treatment was 0.36 ± 0.22. The difference between visual acuity before and after first injection was 0.04 ± 0.22 (p = 0.03). Before fifth injection visual acuity was 0.41 ± 0.21, after – 0.46 ± 0.22 (p = 0.05). Central macular thickness before treatment was 297.81 ± 106.04 μm. The difference between central macular thickness before and after first injection was 85.21 ± 113.37 μm (p &lt; 0.001). Before second injection central macular thickness was 273.57 ± 87.49 μm, after – 234.51 ± 58.96 μm (p = 0.002). Before fourth injection central macular thickness was 237.20 ± 40.87 μm, after – 219.10 ± 42.26 μm (p = 0.04). The mean central macular thickness significantly decreased from 298.15 ± 104.78 to 229.08 ± 56.57 (p &lt; 0.001). In 24 month of treatment the average number of ranibizumab injections was 3.61 ± 1.55. Conclusions. Our study’s results showed that over 24 month best corrected visual acuity improvement was statistically significant after first and fifth injection. Baseline compared with last injection, there was not statistically significant difference. Central macular thickness improvement statistically significant was after first, second and fourth injection. There was statistically significant decreased baseline compared with the last injection. The mean number of ranibizumab injections was 3.61 ± 1.55 in 24 month.

scholarly journals High frequency SD-OCT follow-up leading to up to biweekly intravitreal ranibizumab treatment in neovascular age-related macular degeneration

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Cengiz Tuerksever ◽  
Christian Pruente ◽  
Katja Hatz
Keyword(s):  
Visual Acuity ◽  
Macular Degeneration ◽  
High Frequency ◽  
Subretinal Fluid ◽  
Age Related Macular Degeneration ◽  
Intravitreal Ranibizumab ◽  
Age Related ◽  
Ranibizumab Treatment ◽  
Sd Oct

AbstractA remarkable proportion of neovascular age-related macular degeneration (nAMD) patients respond rather poorly to ranibizumab treatment, in spite of the minimum 4-week follow-up and treatment interval. Usually, retreatments are based on nAMD activity as evaluated by Spectral-domain Optical coherence Tomography (SD-OCT), biomicroscopic fundus examination and visual acuity changes. In this prospective pilot study, we aimed to study SD-OCT changes in a high-frequent follow-up manner (weekly (month 0–6), biweekly (month 7–12)) throughout the first year, which consequently led to intravitreal ranibizumab being administered up to biweekly. Best corrected visual acuity (BCVA) was already significantly improved at week 2. Central retinal thickness (CRT), intraretinal and subretinal fluid (SRF) were significantly improved from week 1 onwards. Half of the patients showed nAMD activity at week 2 or 3 and received the first retreatment earlier than 4 weeks after baseline injection. In total, 46% of retreatments were already applied 2 or 3 weeks after the previous treatment. Greater range of CRT and SRF fluctuation during follow-up was associated with lower final BCVA. Lower baseline BCVA and better SRF improvement at week 2 was associated with greater BCVA improvement. In conclusion, high-frequency SD-OCT follow-up provided a good option for adapting treatment in nAMD individually.

scholarly journals Visual acuity dynamics after phacoemulsification in patients with “wet” form of age-related macular degeneration, treated by intravitreal angiogenesis inhibitor injections

2013 ◽  
Vol 6 (1) ◽  
pp. 44-50 ◽  
Author(s):  
Natalya Viktorovna Chistyakova ◽  
Yuriy Sergeevich Astakhov ◽  
Nikita Yuryevich Dal
Keyword(s):  
Visual Acuity ◽  
Cataract Surgery ◽  
Macular Degeneration ◽  
Angiogenesis Inhibitor ◽  
Age Related Macular Degeneration ◽  
Age Related ◽  
The Mean ◽  
The Difference ◽  
Group 2 ◽  
Wet Amd

Design: prospective non-randomized experimental longitudinal cohort study. The aim of the study: to evaluate the visual acuity after phacoemulsification in patients with the “wet” form of age-related macular degeneration, treated by intravitreal angiogenesis inhibitor injections. Materials: 48 patients (48 eyes) with the “wet” form of AMD, treated by intravitreal angiogenesis inhibitor injections, and incipient cataract. All eyes in the study had a diagnosis of “wet” AMD and underwent cataract surgery. They were followed for a minimum of two years after the cataract surgery. The mean age of patients was 78.16 ± 5 years. There were 36 female (75 %) and 12 male (25 %) patients. Results: All patients were retrospectively divided into two groups. Group No. 1 consisted of 23 patients — operated within a year of the diagnosis of “wet” AMD, and group No. 2 which consisted of 25 patients who had a diagnosis of “wet” AMD for longer than one year prior to the cataract surgery. The mean preoperative visual acuity in the 1st group was 0.16 ± 0.07 (median 0.15), and in patients of group 2 — 0.23 ± 0.06 (median 0,2). Mean visual acuity immediately before surgery in the 1st group was 0.13 ± 0.04 (median 0.09), in the 2nd group — 0.12 ± 0.04 (median 0,08). After surgery, in the 1st group, mean visual acuity was — 0.28 ± 0.08 (median 0.25), in the 2nd group —0.18 ± 0.07 (median 0,15). The difference between the two groups was statistically significant, p < 0.01, t-test. Statistically significant visual acuity increase after surgery was registered in both groups and was preserved after one and two years, when compared to the data before surgery: for the 1st group — 0.13 and 0.1; for the 2nd group — 0,1 and 0.07, respectively (p < 0,01, Wilcoxon criterion). Conclusions: Phacoemulsification is reasonable for eyes with the “wet” form of age-related macular degeneration. Patients with shorter “wet” AMD duration obtain a higher visual acuity increase after cataract surgery. Statistically significant visual acuity increase after surgery is preserved in the majority of patients during next 2 years of follow-up.

scholarly journals Age-related changes of color visual acuity in normal eyes

PLoS ONE ◽  
2021 ◽  
Vol 16 (11) ◽  
pp. e0260525
Author(s):  
Sho Yokoyama ◽  
Yoshiki Tanaka ◽  
Takashi Kojima ◽  
Rie Horai ◽  
Yukihito Kato ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Age Groups ◽  
Color Test ◽  
Long Wavelength ◽  
Age Related ◽  
Cone Function ◽  
Minimum Angle ◽  
White Point ◽  
The Difference ◽  
Age Range

Purpose To evaluate the age-related change in color visual acuity (CVA) in normal eyes. Methods In total, 162 normal eyes (162 subjects, women: 52, men: 110, age range: 15–68 years) with best-corrected visual acuity (BCVA) ≥20/13 were enrolled. Fifteen colors from the New Color Test (chroma 6) were applied to Landolt “C” rings, white point D65 was applied as background, and a luminance of 30 cd/m2 was set for both the rings and the background. These rings were used to measure the chromatic spatial discrimination acuity as the CVA value, while changing the stimulus size. Correlations of the CVA value of each color and age were evaluated. Mean CVA values of all 15 colors (logarithm of the minimum angle of resolution) were compared between age groups in 10-year increments. Results Nine CVA values (red, yellow-red, red-yellow, green, blue-green, green-blue, purple, red-purple, and purple-red) were negatively correlated with age (all p<0.05); the remaining six (yellow, green-yellow, yellow-green, blue, purple-blue, and blue-purple), as well as BCVA were not. The age groups with the best to worst mean CVA values of 15 colors were as follows: 20–29 (mean ± standard deviation, 0.303 ± 0.113), 30–39 (0.324 ± 0.096), 10–19 (0.333 ± 0.022), 50–59 (0.335 ± 0.078), 40–49 (0.339 ± 0.096), and 60–69 (0.379 ± 0.125) years. There were statistically significant differences between mean CVA values of the following groups: 20–29 and 40–49 years; 20–29 and 60–69 years; 30–39 and 60–69 years (all p<0.01). Conclusions The CVA values related to the medium/long-wavelength-sensitive cones were more susceptible to aging than those related to the short-wavelength-sensitive cones. This differed from previous reports, and may be related to the difference in the range of foveal cone function evaluated with each examination.

scholarly journals The Correlation of Age and Postoperative Visual Acuity for Age-Related Cataract

2016 ◽  
Vol 2016 ◽  
pp. 1-7
Author(s):  
Xiaochun Li ◽  
Xiaoguang Cao ◽  
Xianru Hou ◽  
Yongzhen Bao
Keyword(s):  
Visual Acuity ◽  
Linear Correlation ◽  
Rural China ◽  
Visual Outcomes ◽  
Postoperative Visual Acuity ◽  
Age Related ◽  
Peking University ◽  
The Difference ◽  
To Receive ◽  
The Relationship

Purpose. Clinically, what is the best time for age-related cataract (ARC) patients to receive surgeries and get the most benefits is important. We explored the relationship between age and presenting postoperative visual acuity (POVA) in patients from rural China.Methods. Three Lifeline Express Hospital Eye-Train missions of Peking University People’s Hospital were chosen. At the first day after surgery, 3452 ARC eyes with the presenting POVA≥6/60 were enrolled. The relationship between age and POVA was analyzed statistically.Results. In these three missions, there were more female patients than males; the ratio of females to males was 1.71. The average age of females was older than males. Overall, the percentages of patients with good visual outcomes (≥6/18) were significantly decreased with aging. Different regions had variations, but the trends were the same. There was weak linear correlation between age and POVA. The correlations of females were stronger than males in Yuncheng and Sanmenxia and weaker than males in Zhoukou.Conclusion. The good visual outcomes of presenting POVA were significantly decreased with aging and there were weak linear correlations between age and POVA in rural China. The linear correlation might be influenced by the difference of gender and region.

Comparison of In-the-Ear and Over-the-Ear Hearing Aid Fittings

1986 ◽  
Vol 51 (4) ◽  
pp. 362-369 ◽  
Author(s):  
Donna M. Risberg ◽  
Robyn M. Cox
Keyword(s):  
Hearing Aids ◽  
High Frequency ◽  
Comparative Evaluation ◽  
Speech Intelligibility ◽  
Hearing Aid ◽  
Hearing Aid Fitting ◽  
The Difference ◽  
Functional Gain ◽  
The Relationship

A custom in-the-ear (ITE) hearing aid fitting was compared to two over-the-ear (OTE) hearing aid fittings for each of 9 subjects with mild to moderately severe hearing losses. Speech intelligibility via the three instruments was compared using the Speech Intelligibility Rating (SIR) test. The relationship between functional gain and coupler gain was compared for the ITE and the higher rated OTE instruments. The difference in input received at the microphone locations of the two types of hearing aids was measured for 10 different subjects and compared to the functional gain data. It was concluded that (a) for persons with mild to moderately severe hearing losses, appropriately adjusted custom ITE fittings typically yield speech intelligibility that is equal to the better OTE fitting identified in a comparative evaluation; and (b) gain prescriptions for ITE hearing aids should be adjusted to account for the high-frequency emphasis associated with in-the-concha microphone placement.

The influence of osteopathic correction on the rate of various rhythms of the body

2019 ◽  
pp. 64-71 ◽  
Author(s):  
A. E. Chernikova ◽  
Yu. P. Potekhina
Keyword(s):  
Heart Rate ◽  
Respiratory Rate ◽  
Age Groups ◽  
Biomechanical Properties ◽  
Dispersion Analysis ◽  
The Body ◽  
Body Tissues ◽  
Age Related ◽  
Significant Difference ◽  
Before And After

Introduction. An osteopathic examination determines the rate, the amplitude and the strength of the main rhythms (cardiac, respiratory and cranial). However, there are relatively few studies in the available literature dedicated to the influence of osteopathic correction (OC) on the characteristics of these rhythms.Goal of research — to study the influence of OC on the rate characteristics of various rhythms of the human body.Materials and methods. 88 adult osteopathic patients aged from 18 to 81 years were examined, among them 30 men and 58 women. All patients received general osteopathic examination. The rate of the cranial rhythm (RCR), respiratory rate (RR) heart rate (HR), the mobility of the nervous processes (MNP) and the connective tissue mobility (CTM) were assessed before and after the OC session.Results. Since age varied greatly in the examined group, a correlation analysis of age-related changes of the assessed rhythms was carried out. Only the CTM correlated with age (r=–0,28; p<0,05) in a statistically significant way. The rank dispersion analysis of Kruskal–Wallis also showed statistically significant difference in this indicator in different age groups (p=0,043). With the increase of years, the CTM decreases gradually. After the OC, the CTM, increased in a statistically significant way (p<0,0001). The RCR varied from 5 to 12 cycles/min in the examined group, which corresponded to the norm. After the OC, the RCR has increased in a statistically significant way (p<0,0001), the MNP has also increased (p<0,0001). The initial heart rate in the subjects varied from 56 to 94 beats/min, and in 15 % it exceeded the norm. After the OC the heart rate corresponded to the norm in all patients. The heart rate and the respiratory rate significantly decreased after the OC (р<0,0001).Conclusion. The described biorhythm changes after the OC session may be indicative of the improvement of the nervous regulation, of the normalization of the autonomic balance, of the improvement of the biomechanical properties of body tissues and of the increase of their mobility. The assessed parameters can be measured quickly without any additional equipment and can be used in order to study the results of the OC.

Results of studying the dimensional accuracy of the bases of complete removable prostheses made using 3D printing and traditional technologies

2020 ◽  
pp. 34-39
Author(s):  
Vokulova Yu.A. Vokulova ◽  
E.N. Zhulev
Keyword(s):  
3D Printing ◽  
Traditional Method ◽  
Laser Scanning ◽  
Laser Scanner ◽  
Digital Technologies ◽  
Dimensional Accuracy ◽  
3D Printer ◽  
Significance Level ◽  
Average Value ◽  
The Difference

This article presents the results of studying the dimensional accuracy of the bases of complete removable prostheses made using a 3D printer and the traditional method. Bases of complete removable prostheses were made using an intraoral laser scanner iTero Cadent (USA) and a 3D printer Asiga Max UV (Australia). To study the dimensional accuracy of the bases of complete removable prostheses, we used the DentalCAD 2.2 Valletta software. The Nonparametric Wilcoxon W-test was used for statistical analysis of the obtained data. We found that the average value of the difference with the standard for bases made using digital technologies is 0.08744±0.0484 mm. The average value of the difference with the standard for bases made by the traditional method is 0.5654±0.1611 mm. Based on these data, we concluded that the bases of complete removable prostheses made using modern digital technologies (intraoral laser scanning and 3D printer) have a higher dimensional accuracy compared to the bases of complete removable prostheses made using the traditional method with a significance level of p<0.05 (Wilcoxon's W-test=0, p=0.031). Keywords: digital technologies in dentistry, digital impressions, intraoral scanner, 3D printing, ExoCAD, complete removable dentures.

scholarly journals Genetic biomarkers in the VEGF pathway predicting response to anti-VEGF therapy in age-related macular degeneration

2019 ◽  
Vol 4 (1) ◽  
pp. e000273
Author(s):  
Irina Balikova ◽  
Laurence Postelmans ◽  
Brigitte Pasteels ◽  
Pascale Coquelet ◽  
Janet Catherine ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Macular Degeneration ◽  
Treatment Response ◽  
Multiple Testing ◽  
Age Related Macular Degeneration ◽  
Patient Specific ◽  
Multiple Testing Correction ◽  
Anti Vegf ◽  
Age Related ◽  
Vegf Pathway

ObjectiveAge-related macular degeneration (ARMD) is a leading cause of visual impairment. Intravitreal injections of anti-vascular endothelial growth factor (VEGF) are the standard treatment for wet ARMD. There is however, variability in patient responses, suggesting patient-specific factors influencing drug efficacy. We tested whether single nucleotide polymorphisms (SNPs) in genes encoding VEGF pathway members contribute to therapy response.Methods and analysisA retrospective cohort of 281 European wet ARMD patients treated with anti-VEGF was genotyped for 138 tagging SNPs in the VEGF pathway. Per patient, we collected best corrected visual acuity at baseline, after three loading injections and at 12 months. We also registered the injection number and changes in retinal morphology after three loading injections (central foveal thickness (CFT), intraretinal cysts and serous neuroepithelium detachment). Changes in CFT after 3 months were our primary outcome measure. Association of SNPs to response was assessed by binomial logistic regression. Replication was attempted by associating visual acuity changes to genotypes in an independent Japanese cohort.ResultsAssociation with treatment response was detected for seven SNPs, including in FLT4 (rs55667289: OR=0.746, 95% CI 0.63 to 0.88, p=0.0005) and KDR (rs7691507: OR=1.056, 95% CI 1.02 to 1.10, p=0.005; and rs2305945: OR=0.963, 95% CI 0.93 to 1.00, p=0.0472). Only association with rs55667289 in FLT4 survived multiple testing correction. This SNP was unavailable for testing in the replication cohort. Of six SNPs tested for replication, one was significant although not after multiple testing correction.ConclusionIdentifying genetic variants that define treatment response can help to develop individualised therapeutic approaches for wet ARMD patients and may point towards new targets in non-responders.

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