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In page Corneal abrasion:

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  • Removal techniques: There are mainly two types of techniques, the choice of which will depend on the nature of the foreign body. The first technique is the cotton tip removal, which is indicated in superficial foreign bodies with no surrounding corneal reaction, and the second is the hypodermic needle or nº15 blade removal with which the complete foreign body and any surrounding rust ring can be removed.[citation needed]
  • Irrigation of the ocular surface and upper and lower fornices can be performed after the procedure to wash out any residual loose foreign body material. A 10 mL ampoule of sterile saline is usually sufficient.[citation needed]