Forensic Medicine · Medico-Legal Autopsy and Postmortem Changes (Thanatology)

A body found indoors has both eyes open. A horizontal brownish-black band is present across each exposed sclera, adjacent to the corneal margin. This finding indicates:

  • A Antemortem conjunctival haemorrhage from strangulation
  • B Postmortem drying of exposed sclera, called tache noire
  • C Petechial haemorrhage of asphyxial death
  • D Early corneal opacity indicating a postmortem interval of over 24 hours
Correct answer: B. Postmortem drying of exposed sclera, called tache noire

Explanation

Tache noire is a brownish to black transverse band across the sclera caused by drying of the exposed conjunctiva when the eyelids remain open after death. It appears within a few hours and is purely a postmortem artefact of desiccation, carrying no implication of asphyxia or trauma. Petechiae are punctate and reddish-purple, not a continuous band, and corneal opacity involves the cornea itself rather than producing a band beside it.

Reference: The Essentials of Forensic Medicine and Toxicology, 35th ed.

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