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        // ─── HEADER BLOCK ────────────────────────────────────────────────────────
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              text: "ARTICLE",
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              size: 28,
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            new TextRun({
              text: "Department of Optometry  |  6th Semester, B.Sc. Optometry",
              font: "Times New Roman",
              size: 20,
              color: "555555"
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        // ─── TITLE ────────────────────────────────────────────────────────────────
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          spacing: { before: 200, after: 120 },
          children: [
            new TextRun({
              text: "Eye Strain and Screen Exposure:",
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              font: "Times New Roman",
              size: 40,
              color: "1F4E79"
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            new TextRun({
              text: "Pathophysiology, Clinical Manifestations, and Evidence-Based Management",
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              font: "Times New Roman",
              size: 32,
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          ]
        }),

        // ─── AUTHOR DETAILS ───────────────────────────────────────────────────────
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          children: [
            new TextRun({
              text: "Sabiya",
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              font: "Times New Roman",
              size: 28
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              text: "6th Semester, B.Sc. Optometry",
              font: "Times New Roman",
              size: 24,
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          children: [
            new TextRun({
              text: "Date of Submission: April 28, 2026",
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              size: 22,
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          ]
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        // ─── ABSTRACT ─────────────────────────────────────────────────────────────
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              text: "Digital Eye Strain (DES), also referred to as Computer Vision Syndrome (CVS), is an increasingly prevalent ocular and visual condition resulting from prolonged use of digital screens including computers, smartphones, tablets, and e-readers. Prevalence estimates range from 8.2% to 97% of screen users depending on the population studied and diagnostic criteria applied. The condition manifests as a constellation of visual and ocular surface symptoms including asthenopia (eye strain), headache, dry eye, blurred vision, photophobia, and musculoskeletal discomfort. The primary pathophysiological mechanisms involve accommodative stress, reduced blink rate, incomplete blinks, blue-light exposure, improper ergonomics, and uncorrected refractive errors. Management strategies include optimizing refractive correction, behavioural modifications such as the 20-20-20 rule, environmental adjustments, artificial tear therapy, and blinking exercises. Despite widespread marketing, blue-light blocking lenses lack high-quality evidence of efficacy. This article provides a comprehensive review of the aetiology, pathophysiology, clinical features, diagnosis, and evidence-based management of digital eye strain, particularly relevant to students of optometry in clinical practice.",
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              size: 22,
              italics: true
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          children: [
            new TextRun({ text: "Keywords: ", bold: true, font: "Times New Roman", size: 22 }),
            new TextRun({ text: "Digital Eye Strain, Computer Vision Syndrome, Asthenopia, Dry Eye, Screen Exposure, Optometry, Blue Light, 20-20-20 Rule", font: "Times New Roman", size: 22, italics: true })
          ]
        }),

        // ─── 1. INTRODUCTION ──────────────────────────────────────────────────────
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            new TextRun({ text: "1. INTRODUCTION", bold: true, font: "Times New Roman", size: 28, color: "1F4E79", allCaps: true })
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              text: "The 21st century has witnessed an extraordinary proliferation of digital devices in virtually every sphere of human activity — professional, educational, and recreational. Globally, over 6.8 billion smartphone subscriptions exist, and average daily screen time frequently exceeds 7–10 hours in working adults and students. The COVID-19 pandemic further accelerated this shift, mandating remote learning and virtual workplaces, which dramatically increased screen exposure across all age groups.",
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              text: "This ubiquitous screen exposure has precipitated a corresponding surge in ocular and visual complaints collectively termed Digital Eye Strain (DES) — the preferred contemporary terminology replacing the older label \"Computer Vision Syndrome\" (CVS). DES is defined as \"the development or exacerbation of recurrent ocular symptoms and/or signs related specifically to digital device screen viewing\" (Wolffsohn et al., 2023). Its prevalence has been reported as high as 97%, although wide variation across studies reflects heterogeneity in definitions, populations, and measurement tools.",
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              text: "For optometrists, DES represents one of the most common conditions encountered in primary eye care. A thorough understanding of its aetiology, pathophysiology, and management is essential for evidence-based patient counselling and therapeutic decision-making. This article provides a detailed review of the topic, integrating current research with clinical relevance for 6th semester optometry students.",
              font: "Times New Roman", size: 24
            })
          ]
        }),

        // ─── 2. EPIDEMIOLOGY ──────────────────────────────────────────────────────
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            new TextRun({ text: "2. EPIDEMIOLOGY AND PREVALENCE", bold: true, font: "Times New Roman", size: 28, color: "1F4E79", allCaps: true })
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              text: "The worldwide prevalence of DES varies considerably — from 8.2% to 100% — depending on the subjects evaluated and the assessment method used (Pucker et al., 2024). This wide range is largely attributable to the absence of a universally accepted diagnostic definition and the lack of validated, standardised diagnostic instruments until recently.",
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              text: "High-risk groups include office workers, students, healthcare professionals, and gamers. Studies consistently report higher prevalence among:",
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        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 80 }, children: [new TextRun({ text: "•  Individuals with uncorrected or under-corrected refractive errors", font: "Times New Roman", size: 24 })] }),
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              text: "The most commonly used validated questionnaires for DES assessment are the Computer Vision Syndrome Questionnaire (CVS-Q) and the Computer Vision Symptom Scale (CVSS17).",
              font: "Times New Roman", size: 24
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        }),

        // ─── 3. AETIOLOGY ─────────────────────────────────────────────────────────
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            new TextRun({ text: "3. AETIOLOGY AND RISK FACTORS", bold: true, font: "Times New Roman", size: 28, color: "1F4E79", allCaps: true })
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              text: "DES is multifactorial in aetiology. Contributing factors can be grouped into visual, ocular surface, environmental, and ergonomic categories.",
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        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 80 }, children: [new TextRun({ text: "•  Binocular vision anomalies: Convergence insufficiency, accommodative insufficiency, and heterophoria are frequently exacerbated by sustained near-screen tasks.", font: "Times New Roman", size: 24 })] }),
        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 80 }, children: [new TextRun({ text: "•  Accommodative fatigue: Prolonged near-point fixation induces ciliary muscle fatigue, manifesting as blur, eyestrain, and headache.", font: "Times New Roman", size: 24 })] }),
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        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 80 }, children: [new TextRun({ text: "•  Reduced blink rate: Under normal conditions, spontaneous blink rate is approximately 15–20 blinks/minute. During screen use, this falls to 5–7 blinks/minute, increasing tear film evaporation and ocular surface desiccation.", font: "Times New Roman", size: 24 })] }),
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        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 80 }, children: [new TextRun({ text: "•  Poor ambient lighting — excessively bright or dim environments", font: "Times New Roman", size: 24 })] }),
        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 80 }, children: [new TextRun({ text: "•  Low humidity in air-conditioned or heated rooms, accelerating tear evaporation", font: "Times New Roman", size: 24 })] }),
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        // ─── 4. PATHOPHYSIOLOGY ───────────────────────────────────────────────────
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            new TextRun({ text: "4. PATHOPHYSIOLOGY", bold: true, font: "Times New Roman", size: 28, color: "1F4E79", allCaps: true })
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              text: "The pathophysiology of DES involves two major but interrelated mechanisms: (1) accommodative-vergence system fatigue and (2) ocular surface disease secondary to altered blink dynamics.",
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        new Paragraph({ spacing: { after: 60 }, children: [new TextRun({ text: "4.1 Accommodative-Vergence Mechanism", bold: true, font: "Times New Roman", size: 26, color: "2E75B6" })] }),
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              text: "Digital screens require sustained near fixation, demanding constant ciliary muscle contraction for accommodation and medial rectus contraction for convergence. Prolonged activation without adequate rest leads to ciliary muscle fatigue, lag of accommodation, and symptoms of asthenopia — including aching, burning, tearing, and blurred vision at both near and distance. Individuals with latent hyperopia are particularly susceptible, as they must over-accommodate even for distance viewing. Similarly, convergence insufficiency causes diplopia and ocular discomfort with sustained near tasks.",
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              text: "Sustained screen viewing is associated with a 40–60% reduction in blink rate. Blinks are essential for spreading the tear film across the ocular surface. Reduced and incomplete blinks allow the tear film to destabilise and evaporate, leading to elevated tear film osmolarity, corneal epithelial disruption, and activation of inflammatory mediators. This cascade produces the symptoms of dry eye — burning, foreign body sensation, photophobia, and reflex tearing — which closely mirror classic DES symptomatology. The mechanisms attributed to ocular surface disease exacerbation in DES include reduced blink rate and completeness, partial or uncorrected refractive error, and cognitive demand of screen tasks (TFOS Wolffsohn et al., 2023).",
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              text: "Blue light (380–500 nm wavelength) emitted by LED screens is absorbed by intrinsically photosensitive retinal ganglion cells (ipRGCs) containing the photopigment melanopsin. These cells project to the suprachiasmatic nucleus of the hypothalamus and regulate circadian rhythms. Evening screen exposure suppresses melatonin secretion, delays sleep onset, and disrupts sleep architecture. While blue light at ambient screen intensities is unlikely to cause direct photochemical retinal damage in normally sighted individuals, its circadian and pupillary effects are clinically significant. At higher wavelengths, blue light also contributes to retinal fatigue and glare sensitivity.",
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        // ─── 5. CLINICAL FEATURES ─────────────────────────────────────────────────
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              text: "DES presents with a broad symptom complex affecting both the ocular surface and the visual system. Common symptoms include:",
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        // Table of symptoms
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                new TableCell({ children: [new Paragraph({ children: [new TextRun({ text: "Photosensitivity", bold: true, font: "Times New Roman", size: 22 })] })] }),
                new TableCell({ children: [new Paragraph({ children: [new TextRun({ text: "Photophobia, glare sensitivity, afterimage persistence", font: "Times New Roman", size: 22 })] })] })
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            new TableRow({
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                new TableCell({ children: [new Paragraph({ children: [new TextRun({ text: "Sleep-Related", bold: true, font: "Times New Roman", size: 22 })] })] }),
                new TableCell({ children: [new Paragraph({ children: [new TextRun({ text: "Difficulty falling asleep, daytime fatigue, reduced sleep quality (due to circadian blue-light effects)", font: "Times New Roman", size: 22 })] })] })
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        }),
        new Paragraph({ spacing: { after: 160 }, children: [new TextRun({ text: "Table 1: Symptom categories and manifestations of Digital Eye Strain", italics: true, font: "Times New Roman", size: 20, color: "555555" })] }),

        // ─── 6. DIAGNOSIS ─────────────────────────────────────────────────────────
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            new TextRun({ text: "6. DIAGNOSIS AND CLINICAL ASSESSMENT", bold: true, font: "Times New Roman", size: 28, color: "1F4E79", allCaps: true })
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          spacing: { after: 160 },
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            new TextRun({
              text: "There is currently no single objective test that definitively diagnoses DES. Diagnosis is primarily clinical, supported by validated questionnaires and a comprehensive optometric examination.",
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        new Paragraph({ spacing: { after: 60 }, children: [new TextRun({ text: "6.1 History and Questionnaires", bold: true, font: "Times New Roman", size: 26, color: "2E75B6" })] }),
        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 80 }, children: [new TextRun({ text: "A thorough history should document daily screen time, types of devices, viewing distance, use of corrective lenses, and symptom onset and relief patterns. The two most widely validated instruments are:", font: "Times New Roman", size: 24 })] }),
        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 80 }, children: [new TextRun({ text: "•  CVS-Q (Computer Vision Syndrome Questionnaire) — assesses frequency and intensity of 16 DES symptoms", font: "Times New Roman", size: 24 })] }),
        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 160 }, children: [new TextRun({ text: "•  CVSS17 (Computer Vision Symptom Scale) — 17-item scale evaluating severity of visual and ocular symptoms", font: "Times New Roman", size: 24 })] }),
        new Paragraph({ spacing: { after: 60 }, children: [new TextRun({ text: "6.2 Optometric Examination", bold: true, font: "Times New Roman", size: 26, color: "2E75B6" })] }),
        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 80 }, children: [new TextRun({ text: "•  Visual acuity assessment (distance and near)", font: "Times New Roman", size: 24 })] }),
        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 80 }, children: [new TextRun({ text: "•  Refraction (objective and subjective) — to detect and correct refractive errors", font: "Times New Roman", size: 24 })] }),
        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 80 }, children: [new TextRun({ text: "•  Binocular vision assessment: Cover test, phoria, vergence ranges, NPC (Near Point of Convergence), accommodative amplitude and facility", font: "Times New Roman", size: 24 })] }),
        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 80 }, children: [new TextRun({ text: "•  Tear film assessment: Tear Break-Up Time (TBUT), Schirmer test, osmolarity, blink rate observation", font: "Times New Roman", size: 24 })] }),
        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 160 }, children: [new TextRun({ text: "•  Slit-lamp biomicroscopy: Corneal staining, meibomian gland assessment, conjunctival injection", font: "Times New Roman", size: 24 })] }),

        // ─── 7. MANAGEMENT ────────────────────────────────────────────────────────
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              text: "Providing an accurate, up-to-date refractive correction appropriate for the patient's primary screen viewing distance is the single most important therapeutic intervention. Occupational (task-specific) spectacle lenses tailored for intermediate and near distances are recommended for presbyopic patients. Multifocal lenses, however, have not been shown to reduce visual fatigue compared to single-vision lenses in meta-analytic evidence (Singh et al., 2022).",
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        new Paragraph({ spacing: { after: 60 }, children: [new TextRun({ text: "7.2 Behavioural Strategies — The 20-20-20 Rule", bold: true, font: "Times New Roman", size: 26, color: "2E75B6" })] }),
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              text: "The 20-20-20 rule is a widely advocated clinical recommendation: every 20 minutes of screen use, look at an object at least 20 feet (6 metres) away for at least 20 seconds. This interrupts sustained accommodation and vergence, allowing ciliary muscle recovery and facilitating reflex blink initiation. Conscious blinking exercises and deliberate complete blinks during screen tasks are also recommended.",
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              text: "Artificial tear preparations remain a cornerstone of symptomatic management. The TFOS 2023 review identified secretagogues and warm compress/humidity goggles/ambient humidifiers as promising strategies. Omega-3 fatty acid supplementation (45 days to 3 months) has shown low-certainty evidence of benefit for dry eye symptoms associated with screen use (Singh et al., 2022). Preservative-free formulations are preferred for patients requiring frequent dosing.",
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              text: "Despite widespread commercial marketing, blue-light blocking spectacles have not been shown to reduce visual fatigue symptoms in high-quality trials. A systematic review and meta-analysis (Singh et al., 2022, Ophthalmology) found that blue-blocking spectacles did not improve visual fatigue, with evidence judged of low certainty. The TFOS 2023 report similarly concluded that \"blue-light blocking interventions do not appear to be an effective management strategy\" for DES. Optometrists should counsel patients accordingly, avoiding endorsement of these lenses as primary DES therapy.",
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              text: "Oral carotenoid supplementation (lutein and zeaxanthin) has been shown to improve critical flicker-fusion frequency (CFF) in screen users, a potential marker of visual processing efficiency, though clinical significance remains uncertain. Berry extract (anthocyanin) supplementation did not significantly improve visual fatigue or dry eye in meta-analytic data. Omega-3 supplementation shows the most consistent evidence benefit for the ocular surface component.",
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        // ─── 8. SPECIAL CONSIDERATIONS ────────────────────────────────────────────
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              text: "Children are particularly vulnerable due to greater accommodative amplitude (meaning they can sustain near focus easily, masking strain), combined with rapidly increasing screen time for education and entertainment. Blue light exposure at night is especially concerning for melatonin suppression and sleep quality in developing children. Optometrists should screen for DES symptoms in paediatric populations and counsel caregivers about screen time limits and bedtime device restriction.",
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              text: "Contact lens wear further compromises tear film stability and blink dynamics. Daily disposable lenses with high water content and silicone hydrogel materials offering superior oxygen transmissibility are preferred. Contact lens rewetting drops and scheduled wear removal should be considered. In symptomatic lens wearers, temporary frame spectacle use during prolonged screen sessions may be advisable.",
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              text: "In presbyopic individuals, the inability to accommodate for near and intermediate distances forces awkward postures (head tilting, screen moving) to find the optimal zone of a progressive addition lens. Occupational progressive lenses or dedicated near/intermediate single-vision lenses for screen use are recommended over standard progressives in office and screen-intensive environments.",
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        // ─── 9. PREVENTION ────────────────────────────────────────────────────────
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              text: "DES is largely preventable with appropriate behavioural and environmental modifications. Optometrists are uniquely positioned as primary care eye health professionals to:",
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              text: "From a public health perspective, the high prevalence of DES, its impact on occupational productivity, and its role in worsening dry eye disease make it a significant healthcare burden warranting structured clinical protocols and population-level awareness.",
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        // ─── 10. CONCLUSION ───────────────────────────────────────────────────────
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              text: "Digital Eye Strain is a highly prevalent, multifactorial condition driven by the convergence of accommodative demand, ocular surface disruption, and environmental stressors associated with screen-based work and recreation. Its symptom burden is broad — spanning visual, ocular surface, photosensitivity, musculoskeletal, and sleep dimensions — and significantly impacts quality of life and occupational performance.",
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              text: "Evidence-based management centres on accurate refractive correction, behavioural strategies (particularly regular breaks and blinking exercises), ergonomic optimisation, and targeted ocular surface therapy. Despite their commercial popularity, blue-light blocking lenses lack robust clinical evidence and should not be routinely recommended as primary DES treatment. Omega-3 supplementation shows the most consistent evidence for the ocular surface component.",
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              text: "As eye care professionals, optometrists bear a critical responsibility in identifying, counselling, and managing patients with DES — combining clinical assessment skills with evidence-informed patient education to mitigate the growing ocular health burden of the digital age.",
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        // ─── REFERENCES ───────────────────────────────────────────────────────────
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        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 120 }, children: [new TextRun({ text: "2. Wolffsohn JS, Lingham G, Downie LE, et al. TFOS Lifestyle: Impact of the digital environment on the ocular surface. Ocul Surf. 2023 Apr;28:213–252. doi: 10.1016/j.jtos.2023.04.004. PMID: 37062428.", font: "Times New Roman", size: 22 })] }),
        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 120 }, children: [new TextRun({ text: "3. Pucker AD, Kerr AM, Sanderson J, Lievens C. Digital Eye Strain: Updated Perspectives. Clin Optom (Auckl). 2024;16:49–62. doi: 10.2147/OPTO.S412382. PMID: 39308959.", font: "Times New Roman", size: 22 })] }),
        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 120 }, children: [new TextRun({ text: "4. Mylona I, Glynatsis MN, Floros GD, Kandarakis S. Spotlight on Digital Eye Strain. Clin Optom (Auckl). 2023;15:25–34. doi: 10.2147/OPTO.S389114. PMID: 36875935.", font: "Times New Roman", size: 22 })] }),
        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 120 }, children: [new TextRun({ text: "5. Pavel IA, Bogdanici CM, Donica VC, et al. Computer Vision Syndrome: An Ophthalmic Pathology of the Modern Era. Medicina (Kaunas). 2023 Feb 20;59(3):470. doi: 10.3390/medicina59030470. PMID: 36837613.", font: "Times New Roman", size: 22 })] }),
        new Paragraph({ alignment: AlignmentType.JUSTIFIED, spacing: { after: 120 }, children: [new TextRun({ text: "6. Auffret É, Gomart G, Bourcier T, et al. Digital eye strain: Symptoms, prevalence, pathophysiology, and management. J Fr Ophtalmol. 2021 Dec;44(10):1605–1610. doi: 10.1016/j.jfo.2021.07.006. PMID: 34657757.", font: "Times New Roman", size: 22 })] }),
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