Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1997-05-05
1998-05-26
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351211, 351221, A61B 314, A61B 310
Patent
active
057574626
ABSTRACT:
An ophthalmic apparatus for photographing a section of an anterior part of an eye having slit light projection optical system for projecting a slit light onto an anterior part of an eye to be examined, and section photographing device for photographing a sectional image of the anterior part of the eye where is cut optically by the slit light, including section photographing optical system which is disposed based on the Scheimpflug's principle, the apparatus providing first target projection optical system for projecting a first alignment target onto a cornea of the examined eye, front photographing device for photographing a first alignment target image projected onto the cornea of the examined eye from the front side, first displaying device for displaying an image which is photographed by the front photographing device, second target projection optical system for projecting a second alignment target from a slanting direction corresponding to the examined eye, and second displaying device for displaying a second alignment target image which is photographed by said section photographing device, thereby the propriety of alignment may being judged by observing the displaying condition of the first and second alignment target images respectively on the first and second display device.
REFERENCES:
patent: 5202708 (1993-04-01), Sasaki et al.
patent: 5347331 (1994-09-01), Isogai et al.
patent: 5381194 (1995-01-01), Nishio et al.
patent: 5436679 (1995-07-01), Ohtsuka et al.
Dang Hung X.
Nidek Company, Ltd.
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