Method for displaying a photographing point of a cornea in an ap

Details Method for displaying a photographing point of a cornea in an ap Method for displaying a photographing point of a cornea in an ap

1996-04-22

1998-05-26

Mai, Huy

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351211, 351246, 396 18, A61B 314, A61B 300

Patent

active

057574618

ABSTRACT:
A method for displaying a photographing point of a cornea which is used in an apparatus for obtaining video images of corneal cells. The apparatus includes (a) first optical assembly having a video camera provided in front of a subject eye for observing and obtaining video images of a frontal portion of the subject eye, (b) second optical assembly for projecting slit light to an eyeball surface of the subject eye, and (c) third optical assembly for magnifying a video image of a subject portion of the eye produced based of a projection of the slit light by the second optical assembly and for guiding the image to the video camera so that the magnified video image of the subject portion of the eye is photographed by the video camera; and the displaying method comprises the steps of (i) determining a first coordinate with respect to the video image of the frontal portion of the subject eye, which corresponds to the subject portion of the eye photographed, (ii) determining a second coordinate, which corresponds to a pupil center in the video image of the frontal portion of the subject eye; and (iii) marking and displaying the photographing point of the cornea in the video image of the frontal portion of the subject eye by calculation based upon the first and second coordinates.

REFERENCES:
patent: 5381194 (1995-01-01), Nishio et al.
patent: 5412442 (1995-05-01), Katsuragi et al.
patent: 5436679 (1995-07-01), Ohtsuka et al.
patent: 5548354 (1996-08-01), Kasahara et al.
patent: 5621488 (1997-04-01), Hanamura et al.

Affiliated with

Also associated with

Rating

Method for displaying a photographing point of a cornea in an ap does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for displaying a photographing point of a cornea in an ap, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for displaying a photographing point of a cornea in an ap will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1968473