Comparison of techniques for measuring anterior chamber depth: Orbscan imaging, Smith’s technique, and van Herick’s method
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Frank Eperjesi & Claire Holden
- چاپ و سال / کشور: 2010
Description
Background Evaluation of anterior chamber depth (ACD) can potentially identify those patients at risk of angleclosure glaucoma. We aimed to: compare van Herick’s limbal chamber depth (LCDvh) grades with LCDorb grades calculated from the Orbscan anterior chamber angle values; determine Smith’s technique ACD and compare to Orbscan ACD; and calculate a constant for Smith’s technique using Orbscan ACD. Methods Eighty participants free from eye disease underwent LCDvh grading, Smith’s technique ACD, and Orbscan anterior chamber angle and ACD measurement. Results LCDvh overestimated grades by a mean of 0.25 (coefficient of repeatability [CR] 1.59) compared to LCDorb. Smith’s technique (constant 1.40 and 1.31) overestimated ACD by a mean of 0.33 mm (CR 0.82) and 0.12 mm (CR 0.79) respectively, compared to Orbscan. Using linear regression, we determined a constant of 1.22 for Smith’s slit-length method. Conclusions Smith’s technique (constant 1.31) provided an ACD that is closer to that found with Orbscan compared to a constant of 1.40 or LCDvh. Our findings also suggest that Smith’s technique would produce values closer to that obtained with Orbscan by using a constant of 1.22.
Graefes Arch Clin Exp Ophthalmol (2011) 249:449–454 DOI 10.1007/s00417-010-1500-0 Received: 12 April 2010 / Revised: 6 August 2010 / Accepted: 16 August 2010 / Published online: 10 September 2010
