Comparison of anterior chamber depth measurements using the IOLMaster, scanning peripheral anterior chamber depth analyser, and anterior segment optical coherence tomography

• Published in: British journal of ophthalmology Vol. 91; no. 8; pp. 1023 - 1026
• Main Authors: Lavanya, Raghavan, Teo, Livia, Friedman, David S, Aung, Han T, Baskaran, Mani, Gao, Hong, Alfred, Tamuno, Seah, Steve K, Kashiwagi, Kenji, Foster, Paul J, Aung, Tin
• Format: Journal Article
• Language: English
• Published: BMA House, Tavistock Square, London, WC1H 9JR BMJ Publishing Group Ltd 01-08-2007; BMJ; BMJ Publishing Group LTD; BMJ Group
• Subjects: Aged; Aged, 80 and over; angle closure; Anterior Chamber - anatomy & histology; Anterior Chamber - diagnostic imaging; anterior chamber depth; anterior segment; anterior segment optical coherence tomography; AS-OCT; Biological and medical sciences; Biometrics; biometry; Cornea; Cornea - anatomy & histology; Cornea - diagnostic imaging; Cross-Sectional Studies; Diagnostic Techniques, Ophthalmological; Endothelium; Female; Humans; intraocular lens; IOL; Lens, Crystalline - anatomy & histology; Lens, Crystalline - diagnostic imaging; Male; Medical imaging; Medical sciences; Methods; Middle Aged; Miscellaneous; Ophthalmology; optical coherence tomography; partial coherence interferometry; PCI; Principles; Prospective Studies; scanning peripheral anterior chamber depth analyser; Scientific Report; Singapore - epidemiology; SPAC; Studies; Tomography, Optical Coherence - methods; Ultrasonic imaging; Ultrasonography; Values; Singapore; Measurement; Scanning; Optical coherence tomography; Anterior chamber; Ophthalmology; Anterior segment; Comparative study; Depth
• ISSN: 0007-1161; 1468-2079
• DOI: 10.1136/bjo.2006.113761

Aim: To compare anterior chamber depth measurements by three non-contact devices—the IOLMaster, scanning peripheral anterior chamber depth analyser (SPAC), and Visante anterior segment optical coherence tomography (AS-OCT) Methods: Prospective, cross sectional study of 497 phakic subjects over 50 years of age attending a community clinic in Singapore. Anterior chamber depth of the right eye was measured using all three techniques by the same investigator. Depth measurements were made from the corneal epithelium to the anterior lens surface. The values obtained were compared using Bland–Altman analysis. Results: 232 men and 265 women were examined (mean (SD) age, 63.4 (7.9) years). Mean anterior chamber depth was 3.08 (0.36) mm with IOLMaster, 3.10 (0.44) mm with SPAC, and 3.14 (0.34) mm with AS-OCT. A significant difference was present between the anterior chamber depth measurements recorded by the three devices (p<0.0001). Mean differences between the measurements were: AS-OCT v IOLMaster, 0.062 (0.007) mm (95% limits of agreement, −0.37 to 0.25 mm) (p<0.0001); AS-OCT v SPAC, 0.035 (0.011) mm (−0.44 to 0.51 mm) (p = 0.0001); SPAC v IOLMaster, 0.027 (0.012) mm (−0.57 to 0.50 mm) (p = 0.027). Conclusions: AS-OCT gave systematically deeper anterior chamber measurements than SPAC and IOL-Master. However, as the differences found were small they are unlikely to be clinically important.