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The human heart is a complex organ made up of four chambers: the right and left atria and the right and left ventricles. These internal chambers are separated by partitions known as the interatrial and interventricular septa. The exterior of the heart features a groove known as the coronary sulcus that demarcates the atria from the ventricles, while the anterior and posterior interventricular sulci distinguish between the two ventricles.
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Anterior chamber depth studies.

Kenneth J Hoffer1, Giacomo Savini1

  • 1From the Stein Eye Institute (Hoffer), University of California, Los Angeles, and St. Mary's Eye Center (Hoffer), Santa Monica, California, USA; the G.B. Bietti Foundation-IRCCS (Savini), Rome, Italy.

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|November 26, 2015
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Summary
This summary is machine-generated.

Partial coherence interferometry (PCI) and optical pachymetry accurately measure anterior chamber depth (ACD). Immersion ultrasound (US) underestimates ACD, while posterior capsule contraction shifts the intraocular lens (IOL) posteriorly, causing a hyperopic shift.

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Area of Science:

  • Ophthalmology and Optometry
  • Biomedical Optics
  • Ophthalmic Imaging

Background:

  • Accurate measurement of anterior chamber depth (ACD) is crucial for intraocular lens (IOL) power calculations.
  • Various modalities exist for ACD measurement, each with potential limitations.
  • Understanding postoperative changes in ACD and IOL position is essential for refractive outcomes.

Purpose of the Study:

  • To compare anterior chamber depth (ACD) measurements using optical pachymetry, immersion ultrasound (US), and partial coherence interferometry (PCI).
  • To evaluate changes in ACD and IOL position 1 day and 3 months postoperatively.

Main Methods:

  • A prospective series of 675 eyes measured ACD using optical pachymetry, immersion US, and PCI.
  • Measurements were taken preoperatively and at 1 day and 3 months postoperatively.
  • Refractive error and IOL axial movement were also assessed.

Main Results:

  • Optical pachymetry ACD was comparable to PCI ACD (difference of 0.04 mm, P > .05).
  • Immersion US yielded ACD readings 0.18 mm shorter than optical pachymetry (P < .0001).
  • Postoperative ACD increased, with a mean posterior IOL shift of 0.12 mm, resulting in a +0.23 D hyperopic shift.

Conclusions:

  • Partial coherence interferometry (PCI) provides ACD measurements comparable to optical pachymetry.
  • Immersion ultrasound (US) may underestimate ACD, and this discrepancy is not correctable by sound velocity adjustments.
  • Posterior capsule contraction leads to significant posterior intraocular lens (IOL) displacement and a resultant hyperopic refractive shift.