Retrospective Evaluation of Corneal Foreign Bodies with Anterior Segment Optical Coherence Tomography

Possible Spontaneous Extrusion of a Traumatic Deeply Embedded Intracorneal Foreign Body: A Case Report

“…While majority of cases are mild and superficial, deeply embedded foreign bodies carry a risk of perforation and should be handled with extreme caution [7] . Inappropriate interventions to remove deep corneal foreign bodies can induce corneal perforation [8] .…”

“…The use of anterior segment OCT can aid in determining the level of the intracorneal foreign body. A deeply embedded foreign body can be difficult to recognize with the use of slit-lamp biomicroscopy alone, especially, if it is accompanied by corneal opacity and edema [7] . In our case, anterior segment OCT aided in confirming the depth of the foreign body which directed the decision away from further manipulation and attempts of surgical removal.…”

Insect wing case corneal foreign body: ASOCT-based findings

“…2 3 Metallic CFBs may be deposited either superficially or deeply into the corneal stroma (due to their high velocity), are hyperreflective on ASOCT and cause mirroring and shadowing effect on underlying structures, while organic FBs remain lodged superficially (due to their low velocity) and few organic CFBs such as hairy chestnut spines may not be detectable on ASOCT. 3 To the best of our knowledge, this is the first time, ASOCT is being used for imaging IWC. We noted localised shadowing of corneal details underlying the IWC.…”

“…ASOCT, a valuable non-invasive tool that provides high resolution details of anterior segment structures, is known to aid in diagnosis of CFB and in guiding an appropriate method of its removal 2 3. Metallic CFBs may be deposited either superficially or deeply into the corneal stroma (due to their high velocity), are hyper-reflective on ASOCT and cause mirroring and shadowing effect on underlying structures, while organic FBs remain lodged superficially (due to their low velocity) and few organic CFBs such as hairy chestnut spines may not be detectable on ASOCT 3. To the best of our knowledge, this is the first time, ASOCT is being used for imaging IWC.…”

Clinical Applications of Anterior Segment Optical Coherence Tomography: An Updated Review

“…There are also studies that have shown that AS-OCT can provide clues about the distinguishing characteristics of foreign bodies, for example, opaque materials such as metal and wood tend to have a hyper-reflective anterior border, with posterior border signals blocked from the shadowing effect. With metal foreign bodies, there is also the appearance of a "mirror effect" with hyper-reflective signals either aligned or inverted with the direction of the foreign body, while transparent materials such as plastic and glass can have both hyper-and hyporeflective signals [111,112].…”