<prompt> Commonest site of the foreign body lies inBulbar conjunctivaLimbusSubtarsal sulcusCornea  <response>: Subtarsal sulcus: Ref: 370-73-P, 402-408-KH Intra ocular foreign bodies Chip of iron and steel 90 are commonest foreign body Mechanical effects - In general these include comeal orand scleral perforation, hyphaema, iris hole, rupture of the lens and traumatic cataract, vitreous haemorrhage andor degeneration, choroidal perforation, haemorrhage and inflammation, retinal hole haemorrhage, oedeama and detachment. Extraocular foreign bodies: Small foreign body impact on the comeal or conjuctival surface 674-K Adhere to the superior palpebral conunctiva in the subtarsal sulcus and abrade the cornea with every blink. A pathognomic pattern of linear comeal abrasion may be seen. A subtarsal foreign body is easily missed unless the upper lid is everted. Ascend and lodge in the superior conjucntival fornix and produce chronic conjunctivitis Impact in the bulbar conjunctiva Impact in the comeal epithelium or stroma to a depth proportional to the velocity of the foreign body A very high velocity foreign body may penetrate the cornea or sclera and lodge intraocularly. 