{"id":3747,"date":"2025-09-04T04:42:51","date_gmt":"2025-09-04T04:42:51","guid":{"rendered":"https:\/\/nepaleyehospital.org\/?page_id=3747"},"modified":"2026-02-08T05:34:05","modified_gmt":"2026-02-08T05:34:05","slug":"electrodiagnostic-services-erg-eog-vep","status":"publish","type":"page","link":"https:\/\/nepaleyehospital.org\/?page_id=3747","title":{"rendered":"Electrodiagnostic Services (ERG, EOG, VEP)"},"content":{"rendered":"

Nepal Eye Hospital offers advanced Electrophysiology of Vision (EPV) services<\/strong> using internationally recognized systems from Microvision, France<\/strong>. These tests provide objective, non-invasive assessment of visual pathway function<\/strong>, from the retina to the visual cortex.<\/p>\n

Electrophysiological tests are essential for early diagnosis, differential diagnosis, and monitoring<\/strong> of retinal, optic nerve, and neuro-ophthalmic disorders\u2014especially when clinical examination alone is inconclusive.<\/p>\n

\n

Our Electrophysiology Systems<\/h2>\n

Monopack One ERG \u2022 VEP \u2022 EOG<\/h3>\n

(Microvision, France)<\/em><\/p>\n

Monopack One electrophysiology systems are designed in accordance with ISCEV standards<\/strong>, ensuring accurate, reliable, and reproducible results<\/strong> for both adult and pediatric patients.<\/p>\n

Key Advantages of Microvision EPV Systems<\/h2>\n
    \n
  • \n

    ISCEV-compliant protocols<\/strong>
    Standardized testing for consistent and clinically reliable interpretation.<\/p>\n<\/li>\n

  • \n

    Non-invasive and patient-safe<\/strong>
    No radiation or injections involved.<\/p>\n<\/li>\n

  • \n

    High signal quality and reproducibility<\/strong>
    Essential for disease diagnosis and long-term follow-up.<\/p>\n<\/li>\n

  • \n

    Suitable for adults and children<\/strong>
    Including patients unable to cooperate with subjective vision tests.<\/p>\n<\/li>\n

  • \n

    Objective functional assessment<\/strong>
    Measures visual function beyond structural imaging.<\/p>\n<\/li>\n<\/ul>\n

    Core Electrophysiology Tests & Applications<\/h2>\n

    1. ERG \u2013 Electroretinography<\/h3>\n

    ERG evaluates the functional integrity of the retina<\/strong>, including photoreceptors, bipolar cells, and inner retinal layers.<\/p>\n

    Clinical Applications<\/h4>\n
      \n
    • \n

      Inherited retinal dystrophies<\/strong> (e.g., retinitis pigmentosa)<\/p>\n<\/li>\n

    • \n

      Cone and rod dysfunction<\/strong><\/p>\n<\/li>\n

    • \n

      Unexplained visual loss<\/strong><\/p>\n<\/li>\n

    • \n

      Drug toxicity monitoring<\/strong> (e.g., hydroxychloroquine)<\/p>\n<\/li>\n

    • \n

      Pediatric retinal disorders<\/p>\n<\/li>\n<\/ul>\n

      2. VEP \u2013 Visual Evoked Potential<\/h3>\n

      VEP measures the electrical response of the visual cortex<\/strong> following visual stimulation, assessing the functional integrity of the optic nerve and visual pathways<\/strong>.<\/p>\n

      Clinical Applications<\/h4>\n
        \n
      • \n

        Optic nerve disorders<\/strong><\/p>\n<\/li>\n

      • \n

        Optic neuritis<\/strong><\/p>\n<\/li>\n

      • \n

        Multiple sclerosis-related visual pathway involvement<\/strong><\/p>\n<\/li>\n

      • \n

        Amblyopia assessment<\/strong><\/p>\n<\/li>\n

      • \n

        Delayed visual maturation in children<\/strong><\/p>\n<\/li>\n

      • \n

        Evaluation of visual function in non-cooperative patients<\/p>\n<\/li>\n<\/ul>\n

        3. EOG \u2013 Electro-oculography<\/h3>\n

        EOG evaluates the function of the retinal pigment epithelium (RPE)<\/strong> and its interaction with photoreceptors.<\/p>\n

        Clinical Applications<\/h4>\n
          \n
        • \n

          Best vitelliform macular dystrophy<\/strong><\/p>\n<\/li>\n

        • \n

          RPE dysfunction<\/strong><\/p>\n<\/li>\n

        • \n

          Differentiation of macular dystrophies<\/p>\n<\/li>\n

        • \n

          Evaluation of unexplained macular disease<\/p>\n<\/li>\n<\/ul>\n

          Role of Electrophysiology in Modern Eye Care<\/h2>\n

          Electrophysiological testing complements imaging modalities such as OCT and fundus photography<\/strong> by providing functional information<\/strong>, helping clinicians:<\/p>\n

            \n
          • \n

            Confirm diagnosis when structural findings are unclear<\/p>\n<\/li>\n

          • \n

            Differentiate retinal vs optic nerve pathology<\/p>\n<\/li>\n

          • \n

            Assess disease severity and prognosis<\/p>\n<\/li>\n

          • \n

            Monitor disease progression and treatment response<\/p>\n<\/li>\n<\/ul>\n

            Who Should Undergo Electrophysiology Testing?<\/h2>\n
              \n
            • \n

              Patients with unexplained vision loss<\/p>\n<\/li>\n

            • \n

              Suspected retinal dystrophies<\/p>\n<\/li>\n

            • \n

              Optic nerve and neuro-ophthalmic disorders<\/p>\n<\/li>\n

            • \n

              Pediatric patients with poor visual response<\/p>\n<\/li>\n

            • \n

              Patients on long-term retinal toxic medications<\/p>\n<\/li>\n

            • \n

              Medico-legal and disability assessment cases<\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

              Nepal Eye Hospital offers advanced Electrophysiology of Vision (EPV) services using internationally recognized systems from Microvision, France. These tests provide objective, non-invasive assessment of visual pathway function, from the retina to the visual cortex. Electrophysiological tests are essential for early diagnosis, differential diagnosis, and monitoring of retinal, optic nerve, and… <\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","ngg_post_thumbnail":0,"footnotes":""},"class_list":["post-3747","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/nepaleyehospital.org\/index.php?rest_route=\/wp\/v2\/pages\/3747","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nepaleyehospital.org\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/nepaleyehospital.org\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/nepaleyehospital.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nepaleyehospital.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3747"}],"version-history":[{"count":4,"href":"https:\/\/nepaleyehospital.org\/index.php?rest_route=\/wp\/v2\/pages\/3747\/revisions"}],"predecessor-version":[{"id":3862,"href":"https:\/\/nepaleyehospital.org\/index.php?rest_route=\/wp\/v2\/pages\/3747\/revisions\/3862"}],"wp:attachment":[{"href":"https:\/\/nepaleyehospital.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3747"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}