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 instrument.
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 Sicong Electronics in China for InFOCUS, a non-profit international primary eye care
development organization based in Houston, Texas.
design eliminates the need for many pieces which could
be lost or broken and may be difficult to replace.
clinicians in the USA and other developed countries find
the FOCOMETER® useful for over-refraction of contact
lens wearers and for patients ordinarily difficult to
refract, such as patients with keratoconus.
Contact InFOCUS to
order a FOCOMETER,® to learn about donating
a FOCOMETER® to a colleague in a developing country,
or with any questions that
you may have about the FOCOMETER® or primary eye