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Intraoperative Visualization of Subretinal Injection and Retinal Detachment in Rats
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Visual loss with inner retinal dysfunction, after snake bite: two case reports.

Subhadra Jalali1, Tapas Ranjan Padhi, Reema Bansal

  • 1Srimati Kanuri Santhamma Centre for Vitreo-Retinal Diseases, L V Prasad Eye Institute, Kallam Anji Reddy Campus, Hyderabad, India.

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|May 21, 2013
PubMed
Summary
This summary is machine-generated.

Snake bites can cause delayed vision loss due to neurotoxicity or retinal artery occlusion. Electrophysiological tests are crucial for diagnosing these visual impairments when fundus findings are absent.

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Area of Science:

  • Ophthalmology
  • Toxicology
  • Neuroscience

Background:

  • Snake envenomation can lead to diverse systemic and local effects.
  • Ocular complications following snake bites are infrequently reported, especially with delayed presentation.

Observation:

  • Two patients presented with significant visual loss months after snake bites.
  • Initial fundus examinations revealed no apparent abnormalities in either case.

Findings:

  • One patient exhibited inner retinal dysfunction and neurotoxicity, indicated by subnormal b-wave and abnormal pattern electroretinography.
  • The second patient showed signs suggestive of consecutive optic atrophy secondary to inner retinal dysfunction from central retinal artery occlusion, evidenced by an electronegative b-wave.

Implications:

  • Delayed diagnosis of visual loss post-snake bite is challenging due to the lack of typical clinical signs.
  • Electrophysiological testing, including electroretinography, is vital for identifying the etiology of visual disturbances in such cases.
  • These findings underscore the importance of considering snake bite as a potential cause of unexplained visual loss, even with a delayed presentation.