opioid use disorder
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Opioid Use Disorder (OUD)

Opioid Use Disorder (OUD) is a chronic, relapsing medical condition characterized by the compulsive use of opioids despite harmful consequences. It involves both physical dependence…
opioid overdose
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Opioid Overdose

The global opioid crisis has emerged as a significant public health emergency. Opioid overdose, a leading cause of preventable death, results from the excessive consumption…
ophthalmia sympathetic
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Ophthalmia Sympathetic

Ophthalmia sympathetic, medically termed sympathetic ophthalmia, is a rare but serious bilateral granulomatous uveitis that occurs after penetrating trauma or intraocular surgery in one eye.…
ophthalmia neonatorum
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Ophthalmia Neonatorum

Ophthalmia neonatorum, also known as neonatal conjunctivitis, is a form of eye infection occurring within the first 28 days of life. It is characterized by…
open angle glaucoma
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Open-Angle Glaucoma

Open-angle glaucoma, also known as primary open-angle glaucoma (POAG), is a chronic, progressive optic neuropathy characterized by increased intraocular pressure (IOP) and subsequent damage to…
onchocerciasis
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Onchocerciasis

Onchocerciasis, commonly referred to as river blindness, is a neglected tropical disease (NTD) caused by the filarial parasitic worm Onchocerca volvulus. It is transmitted to…
oligodendroglioma
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Oligodendroglioma

Oligodendroglioma is a rare, slow-growing primary brain tumor originating from oligodendrocytes—the glial cells responsible for producing myelin in the central nervous system. These tumors are…
ocular surface squamous neoplasia
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Ocular Surface Squamous Neoplasia (OSSN)

Ocular Surface Squamous Neoplasia (OSSN) encompasses a spectrum of dysplastic and neoplastic lesions of the conjunctiva and cornea, ranging from mild epithelial dysplasia to invasive…