Medix RAF RULER
RAF
Rule (Royal
Air Force Rule) provides a binocular gauge to measure Objective and Subjective
Convergence as well as Accommodation in 1 mm increments. The RAF Rule consists
of a 50 cm long rule with a slider holding a rotating four-sided cube. Each
side has a different target. The first has a vertical line with a central dot
for convergence fixation. The others provide a limited number of lines of near
reading examples.
A rest is
provided for the cheek to insure consistency and proper height for the patient.
Some studies have shown greater consistence of the NPC when measured with the
RAF Rule compared to using a pencil or finger.
This
instrument is used for determining the objective and subjective convergence
points, examining the accommodation and determining the master eye. The RAF
Rule is useful for both diagnosis and treatment.