An estimation of the worldwide economic and health burden of visual impairment

PurposeTo evaluate the efficacy of photobiomodulation (PBM) treatment for patients with dry age‐related macular degeneration (AMD).MethodsAssessments on 42 eyes with dry AMD (age related eye disease study (AREDS) 2–4) were conducted. Multiwavelength light emitting diode (LED) light comprising of yellow (590 nm), red (670 nm) and near‐infrared (790 nm) bandwidths was applied to subjects’ eyes for a treatment course of 3 weeks. Outcome measures were changes in best‐corrected visual acuity (BCVA), contrast sensitivity (CS), drusen volume and central drusen thickness.ResultsSignificant improvement in mean BCVA of 5.90 letters (p < 0.001) was seen on completion of the 3‐week treatment and 5.14 letters (p < 0.001) after 3 months. Contrast sensitivity improved significantly (log unit improvement of 0.11 (p = 0.02) at 3 weeks and 3 months (log unit improvement of 0.16 (p = 0.02) at three cycles per degree. Drusen volume decreased by 0.024 mm3 (p < 0.001) and central drusen thickness was significantly reduced by a mean of 3.78 μm (p < 0.001), while overall central retinal thickness and retinal volume remained stable.ConclusionThis is the first study demonstrating improvements in functional and anatomical outcomes in dry AMD subjects with PBM therapy. These findings corroborate an earlier pilot study that looked at functional outcome measures. The addition of anatomical evidence contributes to the basis for further development of a non‐invasive PBM treatment for dry AMD.

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“…It is emerging as one of the primary causes of vision impairment in the developed world (Gordois et al. 2012). …”

Section: Introductionmentioning

confidence: 99%

Photobiomodulation reduces drusen volume and improves visual acuity and contrast sensitivity in dry age‐related macular degeneration

Merry

Munk

Dotson

et al. 2016

Acta Ophthalmologica

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“…1 The worldwide economic burden of vision loss is estimated to be about US $3 trillion in 2010 and is anticipated to increase significantly by 2020. 2 Therefore, strategies to develop animal models that closely mirror human ocular diseases are necessary for a better understanding of the underlying causes and in parallel for the development of novel therapeutic approaches. Over the past decade, zebrafish have become an established model to study a variety of human diseases and are more recently becoming a valuable tool for the study of human ophthalmological disorders.…”

Section: Overviewmentioning

confidence: 99%

Zebrafish—on the move towards ophthalmological research

Chhetri

Jacobson

Gueven

2014

Eye

138

114

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Millions of people are affected by visual impairment and blindness globally, and the prevalence of vision loss is likely to increase as we are living longer. However, many ocular diseases remain poorly controlled due to lack of proper understanding of the pathogenesis and the corresponding lack of effective therapies. Consequently, there is a major need for animal models that closely mirror the human eye pathology and at the same time allow higher-throughput drug screening approaches. In this context, zebrafish as an animal model organism not only address these needs but can in many respects reflect the human situation better than the current rodent models. Over the past decade, zebrafish have become an established model to study a variety of human diseases and are more recently becoming a valuable tool for the study of human ophthalmological disorders. Many human ocular diseases such as cataract, glaucoma, diabetic retinopathy, and age-related macular degeneration have already been modelled in zebrafish. In addition, zebrafish have become an attractive model for pre-clinical drug toxicity testing and are now increasingly used by scientists worldwide for the discovery of novel treatment approaches. This review presents the advantages and uses of zebrafish for ophthalmological research.

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“…Age-related macular degeneration (AMD) is a leading cause of visual impairment in elderly individuals, and approximately 50 million old people suffer from AMD worldwide [1]. Based on the clinical classification, AMD can occur as dry (atrophic) or wet (exudative) forms depending on the presence of choroidal neovascularization.…”

Section: Introductionmentioning

confidence: 99%

Expression of Endoplasmic Reticulum Stress Markers GRP78 and CHOP Induced by Oxidative Stress in Blue Light-Mediated Damage of A2E-Containing Retinal Pigment Epithelium Cells

Feng

Chen²,

Sun³

et al. 2014

Ophthalmic Res

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Aims: Age-related lipofuscin N-retinylidene-N-retinylethanolamine (A2E) accumulated in human retinal pigment epithelium (RPE) cells confers susceptibility to blue light-mediated damage, which represents one pathogenesis of age-related macular degeneration. This study investigated the expression of 2 best-characterized endoplasmic reticulum (ER) stress markers, glucose-related protein 78 (GRP78) and C/EBP homologous protein (CHOP), as well as their regulation by oxidative stress after blue light-mediated damage of A2E-containing RPE cells. Methods: ARPE-19 cells were incubated with A2E (10, 25, 50 μM) for 2 h and exposed to blue light for 20 min. A2E distributions in RPE cells were assessed via laser scanning confocal microscope and liquid chromatography-mass spectrometry. Cell viability was measured by a Cell Titer 96 Aqueous One Solution cell proliferation assay. The quantity of intracellular reactive oxygen species (ROS) was detected by dihydroethidium fluorescence using flow cytometry. Expressions of GRP78 and CHOP were measured at both mRNA and protein levels. To examine the role of oxidative stress in regulating GRP78 and CHOP expression, RPE cells were pretreated with the antioxidant N-acetylcysteine (NAC) for 2 h. RNA interference of GRP78 performed by short hairpin RNA was used to evaluate the effect of GRP78 in blue light-mediated damage of RPE cells. Results: After blue light exposure, A2E-treated RPE cells showed a gradual decrease in cell viability and a particular increase in ROS levels. Meanwhile, the expressions of GRP78 and CHOP in A2E-treated RPE cells were significantly increased at different time points after illumination. Pretreatment with NAC attenuated the expression of 2 ER stress markers, especially CHOP in A2E and blue light-treated RPE cells. Silencing of GRP78 by RNA interference upregulated CHOP and caspase-12 expression as well as aggravated the blue light-mediated damage of A2E-laden RPE cells. Conclusion: RPE cells exhibited ROS accumulation and subsequent elevation of GRP78 and CHOP expression after A2E and blue light-induced damage. The ROS scavenger NAC diminished ER stress protein expression, suggesting a connection between ER and oxidative stress in blue light-mediated damage of A2E-containing RPE cells. Besides, GRP78 may play a protective role in it.

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An estimation of the worldwide economic and health burden of visual impairment

Cited by 155 publications

References 41 publications

Photobiomodulation reduces drusen volume and improves visual acuity and contrast sensitivity in dry age‐related macular degeneration

Photobiomodulation reduces drusen volume and improves visual acuity and contrast sensitivity in dry age‐related macular degeneration

Zebrafish—on the move towards ophthalmological research

Expression of Endoplasmic Reticulum Stress Markers GRP78 and CHOP Induced by Oxidative Stress in Blue Light-Mediated Damage of A2E-Containing Retinal Pigment Epithelium Cells

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