on Badal optics, the FOCOMETER® allows the patient
to view a real, unmagnified target, and bring it into
focus, with a direct reading of spherical correction
on a linear diopter scale.
of cylinder for astigmatism is easily accomplished,
utilizing a "clock target" supplied with the
power requirements for presbyopes can also be measured,
simply by first obtaining the distance correction and
then adding plus power in small increments until a target
at the desired "near" distance is clear.
extensive field testing, the FOCOMETER® was found to
be as accurate as other methods of subjective refraction
and retinoscopy. Field test data were published in Optometry
and Vision Science (April 1993).
FOCOMETER® is patented and registered with the F.D.A.
in over 40 countries, the FOCOMETER® is manufactured
by InFOCUS, a non-profit international primary eye care
development organization based in Houston, Texas.