Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Reexamination Certificate
2000-04-14
2001-05-22
Manuel, George (Department: 3737)
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
Reexamination Certificate
active
06234632
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cornea shape measuring instrument for measuring the shape of a cornea of a subject's eye for optometry in ophthalmological clinics, optician's shops, or the like.
2. Description of the Related Art
Conventionally, an instrument is known which projects a plurality of concentric ring-shaped targets toward a cornea of a subject's eye, and measures the distribution of the cornea refractive power by analyzing the shape of an image reflected by the cornea. The results of the measurements are output by a printer or the like. The results of the measurements output by the printer are used in optician's shops as prescription data for contact lens, or in ophthalmological clinics as data for orthokeratology.
Japanese Patent Application Laid-open No. Hei 8-98802 discloses an instrument that the refractive power distribution map of the cornea (hereinafter, simply referred to as “a distribution map”) in relation to the position of the pupil and the cornea, thereby making it possible to easily understand the positional relationship between the distribution map and the pupil or the cornea.
By the way, in the instrument disclosed in Japanese Patent Application Laid Open No. Hei 8-98802, as illustrated in
FIG. 1
, circular figures which designate the shape of the pupil image Ep's or that of the cornea margin image Ei′ are generated by image recognition process, and these figures are superimposed on the distribution map. Therefore, an operator can correctly understand the positional relationship between the distribution map and the eye by referring to the superimposed image displayed on the display unit. However, since an anterior ocular segment image itself is not displayed on the display unit, there is a problem that the operator can not grasp with reality the positional relationship.
SUMMARY OF THE INVENTION
The present invention has been made in view of the above, and therefore has an object to provide a cornea shape measuring instrument which displays a superimposed image obtained by superimposing an anterior ocular segment image on a distribution map image and with which an operator can grasp with reality the positional relationship between the distribution map and the subject's eye.
In order to solve the above problem, according to one aspect of the present invention, there is provided a cornea shape measuring instrument characterized by comprising: obtaining means for obtaining anterior ocular segment image data and distribution data concerning cornea refractive power of a subject's eye; storing means for storing pixel- skipping data for skipping the distribution data; pixel-skipping means for skipping the distribution data based on the pixel-skipping data; and means for displaying the distribution data and the anterior ocular segment image data in superimposed display state.
In order to solve the above problem, according to another aspect of the present invention, there is provided a cornea shape measuring instrument characterized by comprising: obtaining means for obtaining anterior ocular segment image data and distribution data concerning cornea refractive power of a subject's eye; storing means for storing pixel-skipping data for skipping the anterior ocular segment image data; pixel-skipping means for skipping the anterior ocular image data based on the pixel-skipping data; and means for displaying the anterior ocular image data and the distribution data in superimposed display state.
REFERENCES:
patent: 5751396 (1998-05-01), Masuda et al.
patent: 5870167 (1999-02-01), Knopp et al.
patent: 5909270 (1999-06-01), Moser et al.
patent: 8-98802 (1996-04-01), None
Armstrong Westerman Hattori McLeland & Naughton LLP
Kabushiki Kaisha Topcon
Manuel George
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