Posterior lenticonus is seen in -
Lenticonus: It refers to cone-shaped elevation of the anterior pole (lenticonus anterior) or posterior pole (lenticonus posterior) of the lens. Lenticonus anterior may occur in Alpo's syndrome and lenticonus posterior in Lowe's syndrome. REF IMG
Alpo's syndrome
Lowe's syndrome
Marfan syndrome
Homocystinuria
Lens