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S. Cronemberger, E.C. Souza Filho, F.A. Marigo, H.A. Maestrini, N.S. Calixto; Morfometric Study of the Anterior Segment in Normal Eyes by Ultrasound Biomicroscopy (UBM): Differences Among Meridians . Invest. Ophthalmol. Vis. Sci. 2003;44(13):3607.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: to study the anterior segment morphometry in normal eyes using ultrasound biomicroscopy (UBM), analyzing the variations among some parameters in the superior, nasal, inferior and temporal meridians. Methods: we studied 89 patients (89 eyes) with age equal or superior to 20 years and a normal ophthalmologic examination. UBM was performed using a 50 MHz transducer and measurements were taken in an axial image and in 12 radial images from the superior, nasal, inferior and temporal meridians (3 images for each meridian). The following variables were measured on the UBM images: central anterior chamber depth (ACD), iris-lens contact distance (ILCD), the angle opening distance at 250 and at 500 µm from the scleral spur (AOD 250 and AOD 500), the distance between the trabecular band and the ciliary processes (TCPD), the iris thickness at 500 µm from the scleral spur (ID1), the iridozonular distance (IZD), the scleral thickness at 2.0 and 3.0 mm from the scleral spur (ST 2 mm and ST 3 mm) and the ciliary body thickness at 2.0 and at 3.0 mm from the scleral spur (CBT 2 mm and CBT 3 mm). Results: significant differences were observed in all studied variables in accordance to each researched meridian, except in TCPD, ILCD and ID1. Temporal meridian was the widest, with widest angle opening measurements. Inferior meridian presented intermediary angle opening measurements and the thickest sclera and ciliary body. Nasal meridian presented intermediary parameters. Superior meridian was the narrowest one, had the widest posterior chamber, and the thinnest sclera and ciliary body. Conclusions:significant differences were found in most of the studied variables when analyzed in accordance to each meridian, demonstrating that, morphometrically, they are different among them. This is a new work, because we did not find, in the literature, such a systematic examination of the parameters presented in this paper.
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