title: Upbeat nystagmus in a 3.5-year-old boy.
abstract: Upbeat nystagmus is usually a central vestibular nystagmus attributable to structural brainstem or cerebellar lesions. Adult-onset upbeat nystagmus calls for a thorough neurological evaluation. In children, however, it can occur as a transient phenomenon in healthy neonates or as a sensory form of nystagmus that usually transforms into horizontal nystagmus by 2 years of age. We report the case of 3.5-year-old boy with upbeat nystagmus. His ocular examination was within normal limits. Neurological evaluation was normal. Optical coherence tomography testing and Electroretinogram confirmed cone dysfunction. Over the next 6 months the upbeat nystagmus converted to horizontal nystagmus.
authors.affiliation: Department of Pediatric Ophthalmology, Narayana Nethralaya-2, Bengaluru, India. Electronic address: jyoti.matalia@gmail.com.
authors.forename: Jyoti
authors.initials: J
authors.lastname: Matalia
authors.affiliation: Department of Pediatric Ophthalmology, Narayana Nethralaya-2, Bengaluru, India.
authors.forename: Vimal K
authors.initials: VK
authors.lastname: Rajput
authors.affiliation: Department of Pediatric Ophthalmology, Narayana Nethralaya-2, Bengaluru, India.
authors.forename: Geetanjali J
authors.initials: GJ
authors.lastname: Chillal
authors.affiliation: Department of Pediatric Ophthalmology, Narayana Nethralaya-2, Bengaluru, India.
authors.forename: Bhujang K
authors.initials: BK
authors.lastname: Shetty
mesh_terms: D002675:Child, Preschool; D003241:Consanguinity; D004596:Electroretinography; D006801:Humans; D008297:Male; D009759:Nystagmus, Pathologic / Q000175:diagnosis*; D012029:Refraction, Ocular; D017949:Retinal Cone Photoreceptor Cells / Q000473:pathology*; D012164:Retinal Diseases / Q000175:diagnosis*; D041623:Tomography, Optical Coherence; D014792:Visual Acuity; D014795:Visual Pathways / Q000473:pathology*