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PubMed · 474694

Anterior chamber depth measurement using the split-lamp microscope.

I H Jacobs
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Abstract

I devised a new and simple method to measure the anterior chamber depth that requires only a Haag-Streit 900 slit lamp. Viewing the anterior chamber at 45 degrees and matching the height of the corneal slit beam to the depth of the anterior chamber enables the observer to calculate the anterior chamber depth by multiplying the measured slit height by 1.4 or, more accurately, by use of the table provided. The accuracy over the range of clinically encountered depths of the anterior changer is +/- 0.2 mm relative to standard pachometry.

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Anterior ChamberGlaucomaHumansMicroscopyOphthalmologyJournal ArticleResearch Support, U.S. Gov't, P.H.S.

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BibTeXRIS

I H Jacobs. 1979. Anterior chamber depth measurement using the split-lamp microscope.. https://doi.org/10.1016/0002-9394(79)90471-9

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PubMed2007

Model of pulsatile-flow of aqueous humor through the iris-lens canal.

PURPOSE: To present a model of pulsatile-flow of aqueous humor from posterior (PC) to anterior chamber (AC) and to analyze the sensitivity of this novel model in detecting typical high risk conditions predisposing to pupillary block. METHODS: The model assumes noncontinuous flow of aqueous through the iris-lens canal. Aqueous that fills the canal will be ejected toward the AC-side of the canal at certain time intervals, and between 2 events of aqueous ejection there is no actual flow through this canal. Pupillary pumping rate (PPR) was calculated from the aqueous flow rate and the calculated volume of iris-lens canal. RESULTS: PPR values were generated by incorporating pupillary diameter (1 to 8 mm), aqueous flow rate (1 to 2.5 microL/min), and iris-lens canal width (0.5 to 2 mm) and height (3-9 microm) in numerical experimentation with the present model. PPR showed inverse dependence on iris-lens canal height and pupillary diameter and was directly proportional to aqueous flow rate, in agreement with the steady-flow model. However, contrary to the steady-flow model, PPR showed inverse dependence on iris-lens canal width and predicted the anticipated PC-AC pressure gradient changes at simulated light-dark transition in eyes of patients with clinically narrow angles and ultrasound biomicroscopy evidenced pupillary block. CONCLUSIONS: Upon the incorporation of real ultrasound biomicroscopy measurements in numerical experimentations with both models, the present pulsatile-flow model, contrary to the steady-flow model, showed good predictability of PC-AC pressure gradient changes in a typical condition predisposing to pupillary block.

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