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Top-three from the Latin American Glaucoma Society Meeting
Rio de Janeiro, Brazil, October 23-26, 2008

Rodolfo Perez Grossmann

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1. The inability to detect the Scleral Spur (SS) may hamper quantitative analysis of the anterior chamber angle parameters that are dependent on the location of this anatomical structure, particularly in the superior and inferior quadrants. Although the location of the SS could not be determined in 30% of AS-OCT images, the presence or absence of angle closure could still be qualitatively assessed in more than 90% of the AS-OCT images, as other anatomical features of the anterior chamber permitted the assessment of the ACA status (e.g., eyes with deep and open angles with the iris base clearly inserting on the ciliary body, or eyes with large area of iris contact on the angle wall anterior to the insertion of the iris). (Lisandro Sakata, Singapore)
2. It is possible to obtain clear UBM images of the plate area in the majority of eyes with glaucoma drainage devices. The UBM images of the bleb area - an anechoic space surrounded by a well defined bleb wall - are quite distinct from those observed in trabeculectomies. This was observed in an in-vivo prospective study of the plate area in Ahmed S-2 glaucoma valves which also showed that the walls of such blebs were thicker in their anterior peripheral part. Also, lack of an aqueous space over the plate not necessarily corresponded with an elevated IOP. (Daniel Grigera, Buenos Aires, Argentina)
3. In a study of 48 patients (96 eyes) with asymmetric POAG and asymmetric IOP there was no evidence that ocular pulse amplitude (OPA) - an indirect indicator for the choroidal perfusion which reflects the ocular blood flow corresponding to the heart pulse as a function of time - is reduced in the more affected eye. The measurements of IOP and OPA were taken with DCT. The diagnosis of asymmetry required a difference of glaucomatous visual field loss greater than 6 dB in the global index mean deviation (MD) and a difference of 5 mmHg in IOP by Goldmann applanation tonometry (GAT) between the more affected and the contra-lateral eye of the same patient (Marcelo Palis Ventura, Niterói, Brazil