May 2007
Volume 48, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2007
Differences of Ocular Measurements by Nonimmersive Contact A-Scan versus IOL-Master in Patients With Cataracts
Author Affiliations & Notes
  • C. Yu
    Department of Ophthalmology, Montefiore Medical Center, Bronx, New York
  • A. Shrivastava
    Department of Ophthalmology, Montefiore Medical Center, Bronx, New York
  • D. Cartagena
    Department of Ophthalmology, Montefiore Medical Center, Bronx, New York
  • U. Mian
    Department of Ophthalmology, Montefiore Medical Center, Bronx, New York
  • Footnotes
    Commercial Relationships C. Yu, None; A. Shrivastava, None; D. Cartagena, None; U. Mian, None.
  • Footnotes
    Support None.
Investigative Ophthalmology & Visual Science May 2007, Vol.48, 1093. doi:https://doi.org/
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    • Get Citation

      C. Yu, A. Shrivastava, D. Cartagena, U. Mian; Differences of Ocular Measurements by Nonimmersive Contact A-Scan versus IOL-Master in Patients With Cataracts. Invest. Ophthalmol. Vis. Sci. 2007;48(13):1093. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose:: To investigate the difference of preoperative measurements of anterior chamber depth and axial length in patients with cataracts by non-immersive contact A-scan versus non-contact laser (IOL Master).

Methods:: The anterior chamber depth(ACD) and axial length(AL) of 79 eyes from 44 preoperative patients with cataracts were measured by nonimmersive contact A-scan (Sonomed A-2500, USA) and non-contact laser (Carl Zeiss IOL MasterTM V.3.01, Germany) respectively. All measurement were taken by the same investigator (Ms. Cartagena, COA). The two sets of ACD and AL measurements were then analyzed.

Results:: The ACD was significantly deeper by 0.10 mm by A-Scan relative to the measurement taken by the IOL Master (p=0.015). The axial length was significantly smaller by 0.05 mm as measured by A-Scan relative to the measurement taken by the IOL Master (p=0.049). Clinically, this represents approximately a 0.15 diopter difference between the two techniques.

Conclusions:: The anterior chamber depth and axial length measurements made by non-immersive contact A-scan and IOL Master were significantly different. The anterior chamber depth was surprisingly deeper in the contact technique, in which one would expect a shallower measurement due to compressive effects of the probe. The axial length was smaller as measured by the contact technique when comparing with the IOL Master. While this difference appears to be clinically insignificant (0.15D), it may become pertinent when implanting multifocal lenses.

Keywords: cataract • intraocular lens • clinical (human) or epidemiologic studies: systems/equipment/techniques 
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