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PubMed · 15990604

New gonioscopy system using only infrared light.

Kota Sugimoto·Kunio Ito·Koichi Matsunaga·Katsuya Miura·Koji Esaki·Yukitaka Uji
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Abstract

PURPOSE: To describe an infrared gonioscopy system designed to observe the anterior chamber angle under natural mydriasis in a completely darkened room. METHODS: An infrared light filter was used to modify the light source of the slit-lamp microscope. A television monitor connected to a CCD monochrome camera was used to indirectly observe the angle. RESULTS: Use of the infrared system enabled observation of the angle under natural mydriasis in a completely darkened room. CONCLUSION: Infrared gonioscopy is a useful procedure for the observation of the angle under natural mydriasis.

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Anterior ChamberCiliary BodyGlaucoma, Angle-ClosureGonioscopyHumansInfrared RaysIrisMicroscopy, AcousticTrabecular MeshworkJournal ArticleResearch Support, Non-U.S. Gov't

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Kota Sugimoto, Kunio Ito, Koichi Matsunaga, Katsuya Miura, Koji Esaki, Yukitaka Uji. 2005. New gonioscopy system using only infrared light.. https://doi.org/10.1097/01.ijg.0000169388.15641.47

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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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