Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1998-12-18
1999-08-31
Manuel, George
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
600399, A61B 310
Patent
active
059460733
ABSTRACT:
An non-contact type tonometer is disclosed, wherein a compressed fluid is blown against an examinee's eye for deforming the cornea of the eye and detecting a corneal deformed state to measure intraocular pressure of the examinee's eye. This tonometer controls the blowing of fluid by stopping to compress the fluid when a predetermined condition set with reference to the detected results in a deformation start time of the cornea is fulfilled. This makes it possible to measure the intraocular pressure of the examinee's eye by blowing the fluid at lower pressure, thereby to reducing disagreement to the examinee, without applying excessive pressure of fluid to the examinee's eye.
REFERENCES:
patent: 4996990 (1991-03-01), Hideshima
patent: 5107851 (1992-04-01), Yano et al.
patent: 5279300 (1994-01-01), Miwa et al.
patent: 5502521 (1996-03-01), Katou
Manuel George
Nidek Co. Ltd.
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