Ophthalmic apparatus

Claim 2

An ophthalmic apparatus comprising: an index pattern projecting means for projecting the pattern of a cornea shape measuring index for measuring the shape of the cornea on the cornea; a first image pickup means for forming an image of the index for measuring the shape of the cornea; a cornea shape calculating means for calculating the respective shapes of regions of the cornea on the basis of the position of the image of the index determined by processing the image formed by said first image pickup means; a pupil illuminating means for illuminating the pupil of the eye with red light or infrared light; a second image pickup means for forming an image of the pupil illuminated by said pupil illuminating means; a fixation target projecting means for indicating a fixation target on the eye to be examined, said fixation target projecting means including an adjustment means for adjusting the brightness of the fixation target so as to adjust the level of the contraction of the pupil of the eye to be examined when the pupil is measured; a pupil measuring means for measuring the shape or the size of the pupil on the basis of the position of the edge of the pupil determined by processing the image formed by said second image pickup means; and a control means for controlling the operation of said cornea shape calculating means and said pupil measuring means to measure the pupil and the cornea shape successively in a measuring mode.

Claim 3

An ophthalmic apparatus according to claim 1, wherein said first image pickup means is used also as said second image pickup means.

Claim 4

An ophthalmic apparatus comprising: a pattern projecting means for projecting a cornea shape measuring pattern on the cornea of the eye by using red light or infrared light; a first image pickup means for forming an image of the cornea shape measuring pattern formed on the cornea; a curvature calculating means for calculating the respective regional curvatures of regions of the cornea on the basis of the position of the image of the cornea shape measuring pattern determined by processing the image of the cornea shape measuring pattern formed by said first image pickup means; a light projecting means for projecting red light or infrared light into the eye through a pupil of the eye; a second image pickup means for forming an image of the pupil of the illuminated eye by picking up the light projected by said light projecting means and reflected by a fundus of the eye; a fixation target projecting means for indicating a fixation target on the eye to be examined, said fixation target projecting means including means for emitting a certain quantity of light for restricting the contraction of the pupil of the eye to be examined when the pupil is measured; a pupillary information calculating means for calculating information about the pupil on the basis of data obtained by processing the image of the pupil formed by said second image pickup means; and a display means for displaying measured data provided by said curvature calculating means and said pupillary information calculating means.

Claim 5

An ophthalmic apparatus comprising: a pattern projecting means for projecting a cornea shape measuring pattern on the cornea of the eye by using red light or infrared light; a first image pickup means for forming an image of the cornea shape measuring pattern formed on the cornea; a curvature calculating means for calculating the respective regional curvatures of regions of the cornea on the basis of the position of the image of the cornea shape measuring pattern determined by processing the image of the cornea shape measuring pattern formed by said first image pickup means; a light projecting means for projecting red light or infrared light into the eye through a pupil of the eye; a second image pickup means for forming an image of the pupil of the illuminated eye by picking up the light projected by said light projecting means and reflected by a fundus of the eye; a fixation target projecting means for indicating a fixation target on the eye to be examined, said fixation target projecting means including means for emitting a certain quantity of light for restricting the contraction of the pupil of the eye to be examined when the pupil is measured; a pupillary information calculating means for calculating information about the pupil on the basis of data obtained by processing the image of the pupil formed by said second image pickup means; and a display means for displaying measured data provided by said curvature calculating means and said pupillary information calculating means.

Claim 6

An ophthalmic apparatus according to claim 3, wherein said display means may be provided with a graphic display means for displaying a corneal curvature distribution pattern and a pattern of outline of the pupil in a superposed picture.

Claim 7

An ophthalmic apparatus according to claim 3 further comprising: a fixation target projecting optical system for projecting a pattern of a fixation target on the retina, said fixation target projecting means including an adjustment means for adjusting the brightness of the fixation so as to adjust the level of the contraction of the pupil of the eye to be examined, and a control means for controlling the brightness of the fixation target to keep the pupil size of the eye in a natural state of vision.

Claim 8

An ophthalmic apparatus according to claim 3 further comprising an ocular refractive power measuring optical system that projects the pattern of an index on the retina and detects an image of the index reflected by the retina to determine the ocular refractive power of the eye, the optical paths of said light projecting means being partly or entirely common with those of said ocular refractive power measuring optical system.

Claim 9

An ophthalmic apparatus according to claim 6, wherein the light source of said light projecting means is used by said ocular refractive power measuring optical system for projecting the measuring index.

Claim 10

An ophthalmic apparatus according to claim 6, wherein said ocular refractive power measuring optical system is provided with a fixation target optical system that fogs the eye, and said fixation target optical system is provided with a control means for controlling the brightness of the fixation target to keep the pupil size of the eye in a natural state of vision during pupil measurement.

Claim 11

An ophthalmic apparatus according to claim 3 further comprising a transmitting means for transmitting measured data provided by said pupillary information calculating means to a laser keratectomy apparatus.

Claim 12

An ophthalmic apparatus comprising: a cornea shape measuring optical system for illuminating a Placido's disk with red or infrared light into the eye through a pupil of the eye and detecting a reflected image reflected by a fundus of the eye; a pupil measuring optical system for illuminating the interior of the eye with red or infrared light to illuminate a pupillary region and obtaining an image of the pupillary region; a mode selecting means for selecting either a cornea shape measuring mode or a pupil measuring mode; and a cornea/pupil data calculating means for calculating cornea curvature data on the basis of data obtained by processing the reflected image of the Placido's disk obtained by illuminating the cornea with red or infrared light by said cornea shape measuring optical system in the cornea shape measuring mode and calculating pupil data on the basis of data obtained by processing the image of the pupillary region obtained by illuminating the interior of the eye with red or infrared light in the pupil measuring mode.

Claim 13

An ophthalmic apparatus comprising: a cornea shape measuring optical system for illuminating a Placido's disk with red or infrared light into the eye through a pupil of the eye and detecting a reflected image reflected by a fundus of the eye; a pupil measuring optical system for illuminating the interior of the eye with red or infrared light to illuminate a pupillary region and obtaining an image of the pupillary region; a mode selecting means for selecting either a cornea shape measuring mode or a pupil measuring mode; and a cornea/pupil data calculating means for calculating cornea curvature data on the basis of data obtained by processing the reflected image of the Placido's disk obtained by illuminating the cornea with red or infrared light by said cornea shape measuring optical system in the cornea shape measuring mode and calculating pupil data on the basis of data obtained by processing the image of the pupillary region obtained by illuminating the interior of the eye with red or infrared light in the pupil measuring mode.

Claim 14

An ophthalmic apparatus according to claim 10, wherein said cornea shape measuring optical system and said pupil measuring optical system share a common detecting means.

Claim 15

An ophthalmic apparatus according to claim 10 further comprising a display means for displaying measured data provided by said cornea/pupil data calculating means.

Claim 16

An ophthalmic apparatus according to claim 12, wherein said display means has a graphic displaying means capable of displaying a corneal curvature distribution pattern and the pattern of the outline of the pupil in a superposed picture.

Claim 17

An ophthalmic apparatus according to claim 10 further comprising an alignment/observation optical system which illuminates the anterior part of the eye for observation.

Claim 18

An ophthalmic apparatus according to claim 10 further comprising a continuous measurement mode selecting means for selecting a continuous measurement mode in which operations in the pupil measuring mode and the cornea shape measuring mode are carried out continuously.