Vestibular and Visual Field Changes WIth Microprism
Channel: Merrill Bowan
Date: 2012-01-17

Microprism Application - Jesse suffered visual field changes after a 40 foot fall onto his head in the field. Tunnel vision, photophobia and ambulation complications, including falls. Unaided ambulation shows a tendency toward left neglect, falls into walls and loses balance. Trial lenses are plano microprisms (1 P.D. per eye). This recording shows somewhat less stable performance initially than the first demonstration three weeks prior, when he was using crutches. His gait and balance are noticeably improved with microprisms.

Interestingly, at the original demonstration he spontaneously noted that the prisms allowed him to see 15' more hallway with them than without them from about the same camera position (i.e., he could only see the walls of the hallway from the turnaround point in this video into the waiting room beyond). With the prisms, he could see the walls from between the two visible doorways out into the waiting room. His confrontation visual fields are tubular without the prisms, conical with the microprisms.