Detection of Primary Angle Closure Using Anterior Segment Optical Coherence Tomography in Asian Eyes

Comparison of Visante and slit-lamp anterior segment optical coherence tomography in imaging the anterior chamber angle

“…These findings are similar to that observed in previous studies comparing AS-OCT and gonioscopy, and confirm that AS-OCT detects more closed ACAs than gonioscopy. 1,17 Possible reasons accounting for the discrepancies between gonioscopy and AS-OCT have been proposed. 1,17 Although AS-OCT uses infrared light and does not require contact with the eye, it is possible that inadvertent indentation during gonioscopy may have opened the angle, in spite of efforts to avoid accidental indentation.…”

“…1,17 Possible reasons accounting for the discrepancies between gonioscopy and AS-OCT have been proposed. 1,17 Although AS-OCT uses infrared light and does not require contact with the eye, it is possible that inadvertent indentation during gonioscopy may have opened the angle, in spite of efforts to avoid accidental indentation. 1,17 Similarly, the use of minimum amount of visible light to evaluate the ACA during gonioscopy may have led to a certain degree of pupil constriction and angle opening.…”

“…1,17 Although AS-OCT uses infrared light and does not require contact with the eye, it is possible that inadvertent indentation during gonioscopy may have opened the angle, in spite of efforts to avoid accidental indentation. 1,17 Similarly, the use of minimum amount of visible light to evaluate the ACA during gonioscopy may have led to a certain degree of pupil constriction and angle opening. 1,17 Thus, it is possible that gonioscopy may be missing eyes with iridotrabecular contact.…”

“…1,17 Similarly, the use of minimum amount of visible light to evaluate the ACA during gonioscopy may have led to a certain degree of pupil constriction and angle opening. 1,17 Thus, it is possible that gonioscopy may be missing eyes with iridotrabecular contact. The level of irido-angle contact required to define a closed ACA was also different with each technique.…”

“…[1][2][3][4][5][6] Two commercial AS-OCT devices are currently availableFVisante-OCT (Carl-Zeiss Meditec, Dublin, CA, USA) and slitlamp-OCT (SL-OCT, Heildelberg Engineering, Heildelberg, Germany). Although both devices rely on the principle of low-coherence interferometry, there are some differences in the way each device acquires and processes the images.…”