Anterior Segment OCT Leon Au Consultant corneal and glaucoma specialist Manchester Royal Eye Hospital
Zeiss Visante
• Based on low-coherence inter- ferometry using 1310nm superluminescent light emitting diode • Axial resolution 18um (vs 25um in UBM) • Tissue penetration 6mm (vs 5mm UBM) • Non contact and fast • Penetrates cloudy cornea and sclera • Blocked by pigment, no ciliary body
• Has a fixation target • Performed in complete darkness (uses infra-red camera) • Induces accommodation to measure lens movement
Basic function Anterior segment
High resolution of angle
measurement
Anterior segment OCT imaging in mucopolysaccharidoses type I, II, and VI. Ahmed TY, Turnbull AM, Attridge NF, Biswas S, Lloyd IC, Au L , Ashworth JL. Eye (Lond). 2014 Mar;28(3):327-36. doi: 10.1038/eye.2013.281 .
Corneal scar
Endothelial keratoplasty (DSEK)
Brittle cornea syndrome: recognition, molecular diagnosis and management Emma MM Burkitt Wright, Louise F Porter, Helen L Spencer, Jill Clayton-Smith, Leon Au, Francis L Munier, Sarah Smithson, Mohnish Suri, Marianne Rohrbach, Forbes DC Manson, Graeme CM Black Orphanet J Rare Dis. 2013; 8: 68. Published online 2013 May 4. doi: 10.1186/1750-1172-8-68
Post cataract surgery
Trab assessment
The use of anterior segment optical coherence tomography in glaucoma drainage implant surgery. Au L , Fenerty C. Ophthalmic Surg Lasers Imaging. 2008 Mar-Apr;39(2):164-6.
Hypotony
Cyclodiaysis cleft
Cleft under flap
Silicone oil under conjunctiva
Conclusion • High quality images • Non contact • Fast • Tolerant to movement • Extremely valuable tool !!
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