Korean J Ophthalmol.  2004 Jun;18(1):9-14. 10.3341/kjo.2004.18.1.9.

Ultrasound Biomicroscopic Changes after Laser Iridotomy or Trabeculectomy in Angle-closure Glaucoma

• Yoon KC
• Won LD
• Cho HJ
• Yang KJ

• KMID: 1115777
• DOI: http://doi.org/10.3341/kjo.2004.18.1.9

Abstract

This study was performed to demonstrate the ultrasound, biomicroscopic and dimensional changes of angle structure after laser iridotomy (LI) and primary trabeculectomy (PT) in primary angle-closure glaucoma (PACG). Angle-opening distance at a point 500 (m from the scleral spur (AOD500), trabecular-iris angle (theta1), trabecular ciliary process distance (TCPD), ciliary process-iris angle (CPI), iris thickness (ID1, ID3), length of iris-lens contact distance (ILCD) and anterior chamber depth (ACD) were assessed before and after each procedure. Thirteen patients with LI and 16 with PT were prospectively enrolled. There were statistically significant increases in AOD500, theta1, and ILCD in both groups. CPI was decreased in both groups. ACD, TCPD, and iris thickness were not changed significantly. The changes in angle configuration after LI or PT may result more from alterations in aqueous pressure gradients across the iris and the changes of configuration were greater in the iris roots without rotation of ciliary body. However, we didn't find any significant differences in the changes of parameters between the two procedures.

Keyword

angle closure glaucoma; angle structure; laser iridotomy; trabeculectomy; ultrasound biomicroscopy

MeSH Terms

Acute Disease
Aged
Aged, 80 and over
Ciliary Body/surgery/*ultrasonography
Female
Glaucoma, Angle-Closure/surgery/*ultrasonography
Humans
Iridectomy/*methods
Iris/surgery/*ultrasonography
Laser Surgery
Male
Middle Aged
Prospective Studies
Trabecular Meshwork/surgery/*ultrasonography
Trabeculectomy/*methods

Figure

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  Fig. 1. Ultrasound biomicroscopic measurement positions displayed on a diagrammatic representation of the anterior segment of the eye. (A) Angle-opening distance (AOD 500) was measured on the line perpendicular to the trabecular meshwork at a point 500 µm from the scleral spur. The trabecular-iris angle (Θ1) was measured with the apex in the iris recess and the arms of the angle passing through a point on the trabecular meshwork 500 µm from the scleral spur and through the point on the iris perpendicularly opposite. (B) Trabecular ciliary process distance (TCPD) was measured on the line extending from a point 500 µm from the scleral spur perpendicularly through the iris to the ciliary process. Iris thickness was measured 1mm from the iris root (ID1) and at its thickest point near the margins (ID3). Ciliary process-iris angle (CPI) and length of iris-lens contact distance (ILCD) are also indicated.

Reference

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