The purpose of utilizing a chin rest is to fix and standardize the distance from the patient's eyes to the center of the blind spot mapping software screen. Since the distance is now standardized and the technique is now standardized with the computerized software, one can now rely on the data generated for serial testing.
Chin Rest Specifications:
Measurements for all models is determined by the distance from the base to the chin cup. Superior quality stands feature an all metal housing with Gliden Lock Clutch, which will not slip under pressure.
HCRTMR Table Model with 6" Base Adjustable 11.5" to 15" (6 lbs).
This model is more portable than those that clamp on the table. With increased portability, some stability is compromised. If you are planning on utilizing a computer for multiple tasks (patient charting, billing, report writing, blind spot mapping, etc.) this chin rest may work better for you.