Ocular barotrauma caused by mask squeeze during a scuba dive.

I describe the case of a 25-year-old man who, after a scuba dive, had ocular barotrauma caused by mask squeeze. As in most cases, the condition occurred because the patient failed to exhale into the mask during descent to equalize the pressure within the mask. Although alarming in appearance, the condition is generally mild and self-limited. Patients should be instructed in the proper technique of mask clearing before they return to diving to prevent a recurrence.