The black thorn eye can grow up to a maximum length of 50cm.

The black thorn eye pattern hanging is still very characteristic , The black thorn-eye pattern is light blue, with many blue horizontal lines on the head, yellow upper lip, irregular yellow patches behind the eyes, and black-brown stripes at the base of the dorsal fin.

The black thorn is a venomous fish commonly found in coral reef waters in the Indo-Pacific. They like to eat zooplankton. Black thorns are the most tolerant species of turbid waters in the Acanthopteryidae family.