Comparison of techniques for measuring anterior chamber depth: Orbscan imaging, Smith's technique, and van Herick's method

Frank Eperjesi, Claire Holden

Research output: Contribution to journalArticle

Abstract

Background
Evaluation of anterior chamber depth (ACD) can potentially identify those patients at risk of angle-closure 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.
Original languageEnglish
Pages (from-to)449-454
Number of pages6
JournalGraefe's Archive for Clinical and Experimental Ophthalmology
Volume249
Issue number3
Early online date11 Sep 2010
DOIs
Publication statusPublished - Mar 2011

Fingerprint

Anterior Chamber
Angle Closure Glaucoma
Eye Diseases
Linear Models

Keywords

  • adolescent
  • adult
  • anterior chamber
  • ophthalmological diagnostic techniques
  • female
  • angle-closure glaucoma
  • humans
  • male
  • middle aged
  • reproducibility of results
  • young adult

Cite this

@article{d27529be12af454d9ed1f1d97cd0665a,
title = "Comparison of techniques for measuring anterior chamber depth: Orbscan imaging, Smith's technique, and van Herick's method",
abstract = "Background Evaluation of anterior chamber depth (ACD) can potentially identify those patients at risk of angle-closure 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.",
keywords = "adolescent, adult, anterior chamber, ophthalmological diagnostic techniques, female, angle-closure glaucoma, humans, male, middle aged, reproducibility of results, young adult",
author = "Frank Eperjesi and Claire Holden",
year = "2011",
month = "3",
doi = "10.1007/s00417-010-1500-0",
language = "English",
volume = "249",
pages = "449--454",
journal = "Graefe's Archive for Clinical and Experimental Ophthalmology",
issn = "0721-832X",
publisher = "Springer",
number = "3",

}

TY - JOUR

T1 - Comparison of techniques for measuring anterior chamber depth

T2 - Orbscan imaging, Smith's technique, and van Herick's method

AU - Eperjesi, Frank

AU - Holden, Claire

PY - 2011/3

Y1 - 2011/3

N2 - Background Evaluation of anterior chamber depth (ACD) can potentially identify those patients at risk of angle-closure 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.

AB - Background Evaluation of anterior chamber depth (ACD) can potentially identify those patients at risk of angle-closure 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.

KW - adolescent

KW - adult

KW - anterior chamber

KW - ophthalmological diagnostic techniques

KW - female

KW - angle-closure glaucoma

KW - humans

KW - male

KW - middle aged

KW - reproducibility of results

KW - young adult

UR - http://www.scopus.com/inward/record.url?scp=79955632992&partnerID=8YFLogxK

UR - http://www.springerlink.com/content/f10x35532352nx80/

U2 - 10.1007/s00417-010-1500-0

DO - 10.1007/s00417-010-1500-0

M3 - Article

C2 - 20830484

VL - 249

SP - 449

EP - 454

JO - Graefe's Archive for Clinical and Experimental Ophthalmology

JF - Graefe's Archive for Clinical and Experimental Ophthalmology

SN - 0721-832X

IS - 3

ER -