Noncontact type tonometer

Details Noncontact type tonometer Noncontact type tonometer

1994-12-19

1995-11-07

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351211, 128648, A61B 314

Patent

active

054651239

ABSTRACT:
A noncontact type tonometer is provided which is capable of easily detecting whether optical members of the tonometer are stained with dirt or not, and easily finding which one of the optical members is stained. In the noncontact type tonometer, alignment light emitted by an alignment light source is guided to a subject's eye through an alignment light projecting optical system. Part of the alignment light reflected by the eye does not pass through a discharging nozzle and is received by a first light receiving sensor of a first alignment detecting optical system. On the other hand, the other part of the alignment light reflected by the eye passes through the discharging nozzle and is received by a second light receiving sensor of a second alignment detecting optical system. Stains on the optical members are found by a measuring device by which a quantity level of reflected alignment light received by each of the first and second sensors is detected and compared with each other. If the optical members are not stains, pulsed air is discharged from the nozzle toward the eye.

REFERENCES:
patent: 4995393 (1991-02-01), Katsuragi et al.

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