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Evaluation of biometric methods for measuring the anterior chamber depth in the non-contact mode

  • Clinical Investigation
  • Published:
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Abstract

Purpose

High-resolution biometry of the anterior ocular segment is now becoming more and more important against a background of refractive surgery and the evaluation of potentially accommodative lens replacement materials. The aim of this study was a systematic investigation of the currently available non-contact methods for measuring the anterior chamber depth (ACD).

Methods

The ACDs of 50 phakic eyes of 27 patients aged between 19 and 59 years were measured with the IOL-Master (Zeiss), the AC-Master (Zeiss), the Pentacam (Oculus) and slit-lamp pachymetry by Jaeger (Haag-Streit).

Results

The median anterior chamber depth in the investigated eyes was 3.63 mm for the IOL-Master (minimum 2.88 mm, maximum 4.22 mm), 3.802 mm for the AC-Master (2.816 mm−4.373 mm), 3.915 mm for the Pentacam (minimum 2.994 mm, maximum 4.614 mm) and 3.75 mm for Jaeger (2.887 mm−4.29 mm). With a probability of error of α=0.05 there were no significant differences concerning the ACD between the methods of Jaeger and AC-Master, Jaeger and IOL-Master, or Pentacam and AC-Master (Wilcoxon and Wilcox). The intra-individual variability was ±5.4 μm for AC-Master, ±12.7 μm for Pentacam, ±24.5 μm for IOL-Master and ±41.2 μm for Jaeger. The maximum method-dependent difference in ACD determination was 285 μm.

Conclusions

All the methods allow non-contact biometry, but the results might differ due to measuring principles inherent to the system, experience of the examiner and compliance of the patient. Partial coherence interferometry with the AC-Master offers the advantage of measurement exactly along the optical axis with the highest reproducibility and patient compliance.

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Authors and Affiliations

  1. Eye Clinic of the University of Rostock, Rostock, Germany

    B. Meinhardt, O. Stachs, J. Stave, R. Beck & R. Guthoff

  2. Faculty of Medicine, Eye Clinic, University of Rostock, Doberaner Strasse 140, 18055, Rostock, Germany

    O. Stachs

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  1. B. Meinhardt
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  2. O. Stachs
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  3. J. Stave
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  4. R. Beck
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  5. R. Guthoff
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Correspondence to O. Stachs.

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None of the authors has a financial or proprietary interest in any material or method mentioned.

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Meinhardt, B., Stachs, O., Stave, J. et al. Evaluation of biometric methods for measuring the anterior chamber depth in the non-contact mode. Graefe's Arch Clin Exp Ophthalmo 244, 559–564 (2006). https://doi.org/10.1007/s00417-005-0103-7

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  • DOI: https://doi.org/10.1007/s00417-005-0103-7

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