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  • Title: Ethambutol-induced optic neuropathy: Functional and structural changes in the retina and optic nerve.
    Author: Sen S, Mandal S, Banerjee M, Gk R, Saxena A, Aalok SP, Saxena R.
    Journal: Semin Ophthalmol; 2022 Aug; 37(6):730-739. PubMed ID: 35699333.
    Abstract:
    BACKGROUD: Ethambutol hydrochloride (EMB) is used in the treatment of tuberculosis and is used as first line modality in combination with other medications. Ethambutol optic neuropathy (EON) is a rare but well-recognised adverse ocular event in patients who receive ethambutol for the treatment of mycobacterial infections and may be potentially devastating with reversible to irreversible changes in visual acuity. KEY FINDINGS: Optical coherence tomography has been used to evaluate the thickness of retinal nerve fibre and ganglion cell layers to look for degenerative changes and early markers. Electrophysiological tests like multifocal electroretinogram, visual evoked potentials and visual fields have been used to understand the functional changes associated with established EON and also whether these can be used to detect subclinical EON and correlate them with the structural changes. In this review, we have summarised evidence published till December 2021 related to evaluation of structural and functional changes in the retina and optic nerve in eyes with EON.
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