Rosette Cataract
Petaloid/rosette-shaped opacifications are seen in patients who have sustained blunt or penetrating physical trauma to the eye, and rarely due to electric shock, exposure to infrared energy or ionising radiation.
The force of the blunt trauma may result in coup, contrecoup injury or axial expansion of the lens.
The coup ocular injury is a result of direct impact, and results in formation of a Vossius ring as a consequence of compression of the pigmented posterior iris epithelial cells against the anterior lens capsule.
The contrecoup injury generates shock waves along the line of impact of trauma, and may result in posterior cortical opacification in rosette or stellate shape.
The axial expansion causes rapid anterioposterior expansion and may disrupt the lens capsule and/or zonules.
These opacifications may appear immediately after, or even up to few months after the trauma.
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Image from Rajan Eye Care Hospital
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