Figure 1.

(A) In vivo OPE setup: a subject sits in front of an antivibration table with the head strapped into the chin-and-forehead rest mounted on the table. The ultrasound probe is mounted on a holder whose position can be adjusted by an operator. (B) A close-up of the probe tip and the cornea during ultrasound scanning: 1. ultrasound probe, 2. alginate gel, 3. ClearScan probe cover, 4. GenTeal gel, and 5. subject cornea. Items 2 to 4 transmit ultrasound signals with minimal acoustic attenuation. (C) Ultrasound B-mode image of 2 through 5 in B.