To develop a reliable method for performing ultrasound biomicroscopy (UBM)
in the sitting and prone positions. The probe suspended from an articulated
arm was removed and reattached to the arm upside-down for use in the prone
position and horizontally for use in the sitting position. A latex Tono-pe
n tip cover was attached to the edge of the eyecup and was placed over the
transducer through the small hole on the tip of the Tono-Pen tip cover, UBM
was successfully performed in the prone and sitting positions with no loss
of image quality This method can expand the ability of the UBM to examine
alterations in anatomic relationships among anterior segment structures bet
ween the supine, sitting, and prone positions.