scholarly journals Improvement of uncorrected visual acuity and contrast sensitivity with perceptual learning and transcranial random noise stimulation in individuals with mild myopia

2014 ◽  
Vol 5 ◽  
Author(s):  
Rebecca Camilleri ◽  
Andrea Pavan ◽  
Filippo Ghin ◽  
Luca Battaglini ◽  
Gianluca Campana
Keyword(s):  
Visual Acuity ◽  
Perceptual Learning ◽  
Contrast Sensitivity ◽  
Random Noise ◽  
Transcranial Random Noise Stimulation ◽  
Uncorrected Visual Acuity

scholarly journals Repetitive visual cortex transcranial random noise stimulation in adults with amblyopia

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Richard Donkor ◽  
Andrew E. Silva ◽  
Caroline Teske ◽  
Margaret Wallis-Duffy ◽  
Aaron P. Johnson ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Visual Cortex ◽  
Contrast Sensitivity ◽  
Random Noise ◽  
Active Group ◽  
Group Differences ◽  
Non Invasive ◽  
Transcranial Random Noise Stimulation ◽  
Fellow Eyes

AbstractWe tested the hypothesis that five daily sessions of visual cortex transcranial random noise stimulation would improve contrast sensitivity, crowded and uncrowded visual acuity in adults with amblyopia. Nineteen adults with amblyopia (44.2 ± 14.9 years, 10 female) were randomly allocated to active or sham tRNS of the visual cortex (active, n = 9; sham, n = 10). Sixteen participants completed the study (n = 8 per group). tRNS was delivered for 25 min across five consecutive days. Monocular contrast sensitivity, uncrowded and crowded visual acuity were measured before, during, 5 min and 30 min post stimulation on each day. Active tRNS significantly improved contrast sensitivity and uncrowded visual acuity for both amblyopic and fellow eyes whereas sham stimulation had no effect. An analysis of the day by day effects revealed large within session improvements on day 1 for the active group that waned across subsequent days. No long-lasting (multi-day) improvements were observed for contrast sensitivity, however a long-lasting improvement in amblyopic eye uncrowded visual acuity was observed for the active group. This improvement remained at 28 day follow up. However, between-group differences in baseline uncrowded visual acuity complicate the interpretation of this effect. No effect of tRNS was observed for amblyopic eye crowded visual acuity. In agreement with previous non-invasive brain stimulation studies using different techniques, tRNS induced short-term contrast sensitivity improvements in adult amblyopic eyes, however, repeated sessions of tRNS did not lead to enhanced or long-lasting effects for the majority of outcome measures.

scholarly journals Multi-session visual cortex transcranial random noise stimulation in adults with amblyopia

2019 ◽  
Author(s):  
Richard Donkor ◽  
Andrew E. Silva ◽  
Caroline Teske ◽  
Margaret Wallis-Duffy ◽  
Aaron Johnson ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Visual Cortex ◽  
Contrast Sensitivity ◽  
Random Noise ◽  
Active Group ◽  
Group Differences ◽  
Non Invasive ◽  
Transcranial Random Noise Stimulation ◽  
Fellow Eyes

PurposeWe tested the hypothesis that five daily sessions of visual cortex transcranial random noise stimulation would improve contrast sensitivity, crowded and uncrowded visual acuity in adults with amblyopia.MethodsNineteen adults with amblyopia (44.2 ± 14.9yrs, 10 female) were randomly allocated to active or sham tRNS of the visual cortex (active, n = 9; sham, n = 10). tRNS was delivered for 25 minutes across five consecutive days. Monocular contrast sensitivity, uncrowded and crowded visual acuity were measured before, during, 5 minutes and 30 minutes post stimulation on each day.ResultsActive tRNS significantly improved contrast sensitivity and uncrowded visual acuity for both amblyopic and fellow eyes whereas sham stimulation had no effect. An analysis of the day by day effects revealed large within session improvements on day 1 for the active group that waned across subsequent days. No long-lasting (multi-day) improvements were observed for contrast sensitivity, however a long-lasting improvement in amblyopic eye uncrowded visual acuity was observed for the active group. This improvement remained at 28 day follow up. However, between-group differences in baseline uncrowded visual acuity complicate the interpretation of this effect. No effect of tRNS was observed for amblyopic eye crowded visual acuity.ConclusionsIn agreement with previous non-invasive brain stimulation studies using different techniques, tRNS induced short-term contrast sensitivity improvements in adult amblyopic eyes, however, multiple sessions of tRNS did not lead to enhanced or long-lasting effects for the majority of outcome measures.

Boosting vision through combined perceptual learning and non-invasive transcranial random noise stimulation

2015 ◽  
Vol 8 (2) ◽  
pp. 319
Author(s):  
Rebecca Camilleri ◽  
Andrea Pavan ◽  
Antonella Veronese ◽  
Giuseppe Lo Giudice ◽  
Gianluca Campana
Keyword(s):  
Perceptual Learning ◽  
Random Noise ◽  
Non Invasive ◽  
Transcranial Random Noise Stimulation

scholarly journals Long-Term Evaluation of Visual Outcomes and Patient Satisfaction after Binocular Implantation of a Bioanalogic Lens

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Sylwia Wagner ◽  
Grzegorz Wagner ◽  
Ewa Mrukwa-Kominek
Keyword(s):  
Visual Acuity ◽  
Patient Satisfaction ◽  
Contrast Sensitivity ◽  
Case Series ◽  
Spatial Frequencies ◽  
Uncorrected Visual Acuity ◽  
Term Evaluation ◽  
The Mean

Purpose. Long-term evaluation of the visual refractive outcomes and the quality of life after implantation of the WIOL-CF (Medicem, Czech Republic) in both eyes. Design. retrospective, nonrandomized noncomparative case series. Methods. 50 eyes of 25 patients, including 11 women (44%) and 14 men (56%). The age range of the patients was 38 to 77 years (mean age 55.48 ± 10.97 years). All patients underwent bilateral implantation of the WIOL-CF. Exclusion criteria were previous ocular surgeries except for cataract surgery and refractive lens exchange, irregular corneal astigmatism of >1.0 diopter, and ocular pathologies or corneal abnormalities. Postoperative examinations were performed at 14 days and 3, 6, 12 months of surgery; the last follow-up was between 24 and 36 months after the procedure. All exams included manifest refraction, monocular uncorrected visual acuity (UCVA) and distance-corrected visual acuity (DCVA) in 5 m (Snellen), monocular uncorrected visual acuity in 70 cm and 40 cm (Jeager) and binocular UCVA, DCVA in 5 m, 70 cm, and 40 cm, binocular contrast sensitivity (CS) under photopic conditions, binocular defocus curves, high-order aberrations, quality-of-vision VF-14 questionnaire, and spectacle independence. Results. Significant improvement in monocular visual acuity at all distances was demonstrated; the mean postoperative spherical equivalent was 0.32 ± 0.45D. The postoperative means of binocular distance UCVA and BCVA were also improved ( p  < .001) and so were the mean uncorrected intermediate VA (2.053 ± 1.268) and near uncorrected VA (2.737 ± 1.447). There was a significant improvement in contrast sensitivity at all spatial frequencies and higher-order aberration, compared to preoperative results. Conclusions. The evaluation of a WIOL-CF showed good distance, intermediate, and near visual acuity. Contrast sensitivity increased after surgery in all spatial frequencies. Patient satisfaction was high despite some optical phenomena. The rate of postoperative spectacle independence also turned out high. Financial Disclosure. No author has a financial or proprietary interest in any material or method mentioned.

Changes in Visual Parameters in an Adult Amblyope With Vision Therapy

2020 ◽  
Author(s):  
Rajib Mandal
Keyword(s):  
Visual Acuity ◽  
Perceptual Learning ◽  
Contrast Sensitivity ◽  
Brain Stimulation ◽  
Behavioral Treatment ◽  
Video Gaming ◽  
Multiple Modalities ◽  
Vision Therapy ◽  
Motor Perception ◽  
Dichoptic Training

Amblyopia is a common neurodevelopmental visual disorder that results in reduced contrast, motor perception, and excessive crowding along with impaired visual acuity. Literature suggested this disorder can be treated with the help of behavioral treatment methods, including anti-suppression dichoptic training, perceptual learning, and video gaming brain stimulation with a recovery ranging from 40 - 60 days. Here we have presented a case where multiple modalities of vision therapy (VT) were used resulting in a prompt and stable response of visual acuity, contrast sensitivity, and stereopsis.

scholarly journals Perceptual learning improves contrast sensitivity and visual acuity in adults with anisometropic amblyopia

2006 ◽  
Vol 46 (5) ◽  
pp. 739-750 ◽  
Author(s):  
Yifeng Zhou ◽  
Changbing Huang ◽  
Pengjing Xu ◽  
Liming Tao ◽  
Zhuping Qiu ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Perceptual Learning ◽  
Contrast Sensitivity ◽  
Anisometropic Amblyopia

Binocular treatment in adult amblyopia is based on parvocellular or magnocellular pathway

2019 ◽  
Vol 30 (4) ◽  
pp. 658-667 ◽  
Author(s):  
Liu Shuai ◽  
Zou Leilei ◽  
Wen Wen ◽  
Wang Shu ◽  
Liu Gangsheng ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Perceptual Learning ◽  
Contrast Sensitivity ◽  
Critical Period ◽  
Magnocellular Pathway ◽  
Strabismic Amblyopia ◽  
Anisometropic Amblyopia ◽  
Before And After

Introduction: Amblyopia is speculated to be an untreatable disease in the patient, who is beyond the critical period of vision; however, currently, it is treatable in adults. Purpose: This study aimed to elucidate whether the treatment is useful in both anisometropic amblyopia and strabismic amblyopia. In addition, the differences were detected between anisometropic amblyopia and strabismic amblyopia after the same perceptual treatment and whether the suppression in anisometropic amblyopia or strabismic amblyopia could be decreased before and after the treatment. Methods: A binocular perceptual learning was applied for the treatment, the suppression was measured, and the patients were followed up for 2 months after training. Anisometropic amblyopia and strabismic amblyopia groups were subjected to the assessment of stereo, visual acuity, contrast sensitivity, and suppression before and after the training. Results: After 6 weeks of “Diploma Gabor Orientation Coherence” training, in the anisometropic amblyopia group, the outcomes of visual acuity (t = 3.114, p = 0.026) and contrast sensitivity (t = 7.786, p = 0.001) were increased significantly. While in the strabismic amblyopia group, the outcomes of stereo (t = 2.987, p = 0.040) and contrast sensitivity (t = 3.638, p = 0.022) were increased significantly. Conclusion: After Diploma Gabor Orientation Coherence training in the same frequency and in the same duration, the anisometropic amblyopia group got an improvement in visual acuity, but the strabismic amblyopia group got an improvement in stereo. As there are evidences to show that anisometropic amblyopia and strabismic amblyopia were injured in different pathways, we think the diverse results might come from the different pathway injury in anisometropic amblyopia and strabismic amblyopia.

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