EP1971253A1 - Appareil de topographie cornéenne à dispositifs supplémentaires intégrés - Google Patents

Appareil de topographie cornéenne à dispositifs supplémentaires intégrés

Info

Publication number
EP1971253A1
EP1971253A1 EP05805155A EP05805155A EP1971253A1 EP 1971253 A1 EP1971253 A1 EP 1971253A1 EP 05805155 A EP05805155 A EP 05805155A EP 05805155 A EP05805155 A EP 05805155A EP 1971253 A1 EP1971253 A1 EP 1971253A1
Authority
EP
European Patent Office
Prior art keywords
light
disc
eye
cornea
videocamera
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05805155A
Other languages
German (de)
English (en)
Inventor
Paolo Pasquini
Alessandro Foggi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HESP Technology Srl
Original Assignee
HESP Technology Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HESP Technology Srl filed Critical HESP Technology Srl
Priority to EP08008897A priority Critical patent/EP2016888A1/fr
Publication of EP1971253A1 publication Critical patent/EP1971253A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/14—Arrangements specially adapted for eye photography
    • A61B3/15—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing
    • A61B3/152—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing for aligning
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/107—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining the shape or measuring the curvature of the cornea
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/11—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for measuring interpupillary distance or diameter of pupils
    • A61B3/112—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for measuring interpupillary distance or diameter of pupils for measuring diameter of pupils
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/0008—Apparatus for testing the eyes; Instruments for examining the eyes provided with illuminating means

Definitions

  • the present invention relates to the field of ophthalmology and, in particular, it relates to a corneal topography apparatus with further integrated devices suitable for carrying out additional diagnostics.
  • documents WO0232298 and EP1371322A1 describe an ophthalmic measuring device comprising a corneal topography apparatus having a pupillometer integrated in it.
  • the apparatus comprises a videocamera' s path coaxial to a Placido disc having a fixation visible light LED that can align the eye to the videocamera.
  • it comprises an infrared LED, which is located on the same path of the camera, and that by means of its reflection guides a doctor to align the videocamera with the optical axis of the eye of the patient and to determine, by suitable calculations, the position of the optical axis on the image.
  • the apparatus comprises, furthermore, a visible neon light located behind the cone, used for bringing the pupil to a minimum dilation for making the measurements.
  • a visible neon light located behind the cone, used for bringing the pupil to a minimum dilation for making the measurements.
  • the light reflected by the surface of the cornea and previously projected by the Placido disc instead, allows to determine the corneal topography.
  • Both known devices comprise also a plurality of infrared light LEDs, arranged laterally on the Placido disc, for lighting the eye with grazing light and allowing measurements of the pupil.
  • EP1371322A1 has the drawback that a dynamic measurement of the shape of the pupil is not provided during a transient corresponding to pupil contraction (passage from scotopic to photopic condition) , and only an analysis at pupil dilation (passage from photopic condition to scotopic) is allowed.
  • the visible light source that causes the pupil to contract is located behind the Placido disc. Then, the portion of visible light that reaches the surface of the cornea is split into a plurality of concentric rings, corresponding to transparent rings of the Placido disc; this light, reflected by the cornea, is detected by the videocamera and overlaps to the image of the pupil, disturbing the detection of the pupil contour, which cannot be obtained accurately.
  • EP1371322A1 Another drawback of EP1371322A1 is that this device detects the optical axis of the eye reading the position of a small lighted area created by the infrared light of the fixation LED as reflected by the cornea, obtaining the position of the optical axis as average on the pixels read by the sensor of the videocamera. In this case, the measure could result inaccurate, because miscalculations can derive from an evaluation based on a very limited number of pixels sensed by the videocamera.
  • a further feature of the invention is to provide a pupillometer integrated in a corneal topography apparatus capable of measuring the shape of the pupil and its variation during a dynamic measurement.
  • Another feature of the invention is to provide a pupillometer integrated in a corneal topography apparatus capable of measuring with maximum precision the exact curvature of the cornea.
  • a feature of the invention to provide a device capable of carrying out, in a single workstation, an analysis of the surface of the cornea by the topography, an accurate exam on the pupil dynamics in different lighting conditions during the contraction and dilation phases, and an actual fitting status of a contact lens on a cornea.
  • a diagnostic apparatus in the field of ophthalmology, comprising a videocamera and means for carrying out a corneal topography of an eye, wherein said eye has an optical axis and a pupil, comprising furthermore: - first light means for lighting the pupil with infrared light in a step of measuring the pupil contour by said videocamera;
  • said apparatus comprises fixation light means, suitable to align the eye with said videocamera, wherein said videocamera has an optical path, said fixation light means comprising a visible fixation light source arranged laterally with respect to said optical path, said fixation light being incident on a semitransparent lamina, of beam splitter type, arranged inclined with respect to said fixation light and to said optical path, in order to direct said fixation light along said optical path.
  • said light is partially reflected by the beam splitter and crosses the centre of the Placido disc in order to be visible by the patient only when the eye is aligned with the videocamera same. Then, to align the eye the patient has simply to look at the above described fixation light source.
  • said means for carrying out a corneal topography comprise:
  • Placido disc having a plurality of concentric transparent and not transparent rings alternated to one another, said disc being arranged coaxially to said videocamera;
  • said means for backlighting said disc comprises a light source selected from the group comprised of:
  • - at least one fluorescent light source in particular neon light
  • said first light means and said second light means that are coincident to each other comprise a plurality of infrared lights sources, in particular LEDs, located eccentrically on the surface of said Placido disc according to a geometry such that the barycentre of their images reflected on the eye coincides with said optical axis.
  • said plurality of infrared light sources comprises a number of light sources arranged at a short distance from the centre of said Placido disc respectively at the vertices of a regular triangle, square, pentagon, hexagon, etc., concentric with said disc.
  • said plurality of infrared light sources is arranged on a first opaque ring of said Placido disc.
  • said apparatus comprises means for lighting the eye with visible light for causing the contraction of the pupil.
  • said means for lighting it is possible to carry out a measurement of the variation of the shape of the pupil in photopic condition starting from a scotopic condition where the eye is not yet hit by visible light.
  • said means for lighting the eye with visible light comprises at least one visible light source, in particular a LED, located eccentrically on the surface of said Placido disc and oriented towards the eye, in a direction that is not grazing with respect to the eye.
  • said means for lighting the eye with visible light comprises two light sources, located at a short distance from the centre of said Placido disc and diametrically opposite from each other with respect to said centre.
  • the side surface and/or a rear face of said infrared light sources and of said visible light source (s) are coated with opaque material, in order not to provide any backlighting to said disc.
  • said infrared light sources and/or said visible light source (s) are put in corresponding holes made through the above described Placido disc.
  • the rear part of the disc is not lighted avoiding that on the eye the rings of the disc reflect.
  • the light delivered by said source is sent only in a desired direction, and not along or behind the Placido disc, and thus avoiding noise in the measurements.
  • means are provided for testing operatively the correct fitting with a contact lens on said cornea.
  • a diagnostic apparatus in the field of ophthalmology comprises a videocamera and means for carrying out a corneal topography of an eye, wherein said eye has an optical axis and a pupil, characterised in that it comprises means for testing operatively the correct fitting with a contact lens on said cornea.
  • said apparatus comprises:
  • Placido disc having a plurality of concentric alternated transparent and not transparent rings
  • said means for testing comprises:
  • - light means for exciting an amount of a contrast means, in particular, fluoresceine, operatively put between the cornea and the inner surface of a contact lens applied on said cornea, said videocamera being suitable for measuring the light emitted by said contrast means when excited;
  • a contrast means in particular, fluoresceine
  • said light means for exciting said contrast means are selected from the group comprised of:
  • At least one light source in particular a LED, which emits a bright spectrum suitable for exciting said contrast means
  • At least one light source in particular a LED, which emits visible light, associated to a filter having a pass band containing the spectrum of excitation of said contrast means.
  • said at least one source that emits a bright spectrum suitable for exciting said contrast means is located in a position selected from the group comprised of:
  • said at least one source that emits a bright spectrum suitable for exciting said fluoresceine has a colour having at least one peak transmission value with wavelength suitable for exciting said fluoresceine.
  • said apparatus comprises a filter selected from the group comprised of:
  • a fixed filter arranged on the optical path between the eye and said videocamera, said filter being suitable for cutting the wavelength lower than a predetermined value less than the minimum wavelength of interest for analysis;
  • releasable selective filter suitable for causing only the wavelength to pass that is set in the spectrum of transmission of said contrast means, where in particular said releasable filter causes only the wavelength to pass that corresponds to the spectrum of transmission of excited fluoresceine .
  • said fixed filter is obtained on said beam splitter arranged along the optical path between the eye of the patient and the videocamera, said beam splitter being capable of cutting the wavelength lower than a predetermined value less than the minimum wavelength of interest for analysis.
  • said apparatus comprises means for determining a simulation of the position of a contact lens on the cornea, comprising:
  • Means are provided, in particular, for comparing the results of the application of said means for testing relative to a previous analysis with the results of the application of said means for testing relative to a successive analysis.
  • said apparatus comprises : - first light means for lighting the pupil with infrared light in a step of measuring the pupil contour;
  • the above described apparatus is capable to carry out a dynamic measurement of the geometry of the pupil, of the geometry of the cornea and of testing operatively the correct fitting of a contact lens on a cornea, this apparatus integrating the above described functions .
  • a simulation can be made of the position of a contact lens on the cornea, by using: - means for loading from a first memory the coordinates of a lens;
  • Means can also be provided for comparing the results of the application of said means for testing relative to a previous analysis with the results of the application of said means for testing relative to a successive analysis.
  • - figure 5 shows diagrammatically a scotopic image of a pupil detected with an apparatus according to the invention
  • - figure 6 shows a photopic image of the pupil subsequent to that of figure 5;
  • figure 7 shows a cross section of an exemplary embodiment alternative to that of figure 3;
  • - figures 8 and 9 show an apparatus according to an aspect of the invention, having a plurality of LEDs that emit a spectrum of light suitable for exciting an amount of fluoresceine put on the surface of the cornea to carry out an analysis of correct fitting of a contact lens on a cornea;
  • - figures 10, 11 and 12 show an alternative exemplary embodiment of an apparatus according to the invention having a plurality of visible LEDs (for example white) associated to respective filters suitable for causing only light to pass capable of exciting the fluoresceine;
  • - figures 13 and 14 show a further exemplary embodiment of a device according to the invention, having four infrared LEDs, two visible light LEDs and blue light LEDs, capable to carry out a topographic analysis, a pupillometric analysis and a real analysis by fluoresceine;
  • - figures 15 and 16 show an exemplary embodiment of a corneal topography apparatus comprising two blue LEDs for carrying out a real analysis by fluoresceine.
  • the apparatus according to the invention in addition to carrying out a topographic analysis for detecting the precise curvature of a cornea and the position of the optical axis giving a map of such curvature to an operator, can carry out a pupillometric analysis detecting the pupil contour and the relative centre both in steady and. dynamic conditions during transients of contraction (passage from scotopic to photopic condition) and dilation (passage from photopic condition to scotopic) . Furthermore, alternatively, or in addition, it can carry out a real analysis by fluoresceine for testing a contact lens fitting on a cornea.
  • the images can be obtained even as a film. Such images can be transferred in real time to a computer connected to the apparatus according to the invention.
  • a computer connected to the apparatus according to the invention.
  • FIGS. 1 and 2 an elevational front view and a rear view are shown respectively of an optical apparatus with function of corneal topography apparatus 1 according to the invention, comprising a measuring head 6, connected to a support arm 5 movable along two directions 7 and 8.
  • the device 6 comprises a Placido disc 2 that covers a carter 3 that contains an optical unit described hereinafter and has a videocamera, a lighting system and a control electronics .
  • the image caught by the videocamera is shown on a display 4 arranged on the rear of the device 6.
  • the corneal topography apparatus 1 rests on a fixed base frame 8 and is located in front of a support 9 for the face of a patient.
  • Figures 3 and 4 show respectively a cross sectional view and an elevational front view of the measuring head 6, comprising the Placido disc 2, consisting of a shell with conical shape and have a plurality of concentric opaque and transparent alternated rings, covering carter 3 that has function of support.
  • the rear of the Placido disc 2 is backlighted by a light source 31, for example formed by a plurality of visible light LEDs, in particular red, and arranged as an arch.
  • the light coming from LED 31, which filters through the Placido disc 2 at the transparent rings, projects on the cornea a plurality of luminous concentric rings, whose reflected light is read by a videocamera 10 and provides images (so called keratoscopic) that give information on the curvature of the cornea of the eye 23.
  • the videocamera 10 comprises an optical unit 11 for focusing on a shot image, which is caught following an optical path that has line 20 as an axis and passes through a transparent glass or lens 30 that protects physically the rear part of the disc from powder or dirt
  • the measuring head 6, comprises a plurality of infrared LEDs, for example respectively four LEDs 14, 15, 16, 17, arranged on the Placido disc 2 at a short distance from the centre, creating the vertices of a square concentric with disc 2 same.
  • the above described LEDs are arranged on the smaller opaque ring of disc 2 and project light beams 21 and 22 on the eye.
  • the measuring head 6, described as an example comprises two visible light LEDs 18 and 19 arranged on the Placido disc 2 at a short distance from the centre and in a position diametrically opposite to each other.
  • such visible light LEDs 18 and 19 are arranged on the second opaque ring starting from the centre.
  • all the LEDs 14, 15, 16, 17, 18 and 19, which have been arranged in corresponding holes of the Placido disc have the side surface and the base shielded with an opaque coating layer, blocking the diffusion of the light in directions that are different from a forward direction, for orienting the light same and allowing the measurements.
  • the LEDs 14, 15, 16, 17, and/or 18 and 19 are selectively turned on, and all the other light means are turned off, the image of the disc does not reflect on the eye, giving an image clean of the same, for making for example evaluations and measurements on the pupil.
  • the patient is invited to align the eye 23 with respect to the measuring device 1, looking at a faint and hardly perceptible light point at the centre of disc 2, obtained, as well known, for reflection on a semitransparent mirror 12, so called beam splitter, inclined with respect to the path of the visible light emitted by a light source, for example a visible light LED 13.
  • a light source for example a visible light LED 13.
  • Infrared LEDs 14, 15, 16, 17 are suitable for lighting the eye 23 with the beams 21 and 22 in a way suitable not to affect a full aperture of the pupil, since the infrared light cannot be seen by the human eye, and, at the same time, in order to allow the videocamera, which instead is sensible to infrared light, to shoot images without any visible light.
  • the device 1 may have function of pupillometer and is capable to carry out a detection of the geometry of the pupil in scotopic conditions, i.e. without visible light and at a maximum pupil dilation.
  • Visible light LEDs 18 and 19 instead, when turned on, cause the contraction of the pupil allowing to detect the geometry of the pupil in photopic conditions, i.e. at a maximum contraction.
  • the apparatus may carry out, in addition to a static analysis, also a dynamic analysis of the pupil by means of acquisition in succession of images of the pupil changing from photopic condition to scotopic and vice-versa.
  • Figures 5 and 6 show, in this connection, a scotopic image 50 and a photopic image 51 of a pupil, obtained with a corneal topography apparatus according to the invention.
  • the scotopic image 50 of figure 5 obtained without visible light, shows the pupil 54 at maximum dilation.
  • the iris 53 and the sclera 52 are shown.
  • the infrared beams produced by the respective four LEDs 14-17 shown in figures 3 and 4 is reflected back to the cornea, thus creating, in the caught image 50, respective four luminous dots 60, 61, 62, 63, whose position depends on the curvature of the cornea same.
  • the optical axis is obtained at an intersection with the cornea vertex 64.
  • This measurement of the optical axis is of considerable precision, much higher than in the prior art.
  • the same light means 14-17 are employed that are used for lighting the eye and the pupil in scotopic condition, with considerable advantages, thus reducing as far as possible an overcrowding of light means on the disc.
  • a control unit connected to the pupillometer according to the invention calculates the contour 55 of the pupil 54, lighted with the LEDs 14-17 of figure 3 and 4, calculating then the centre of the pupil 54, indicated by point 65.
  • figure 6 shows a photopic image 51 of the eye, obtained causing the pupil 54 to contract for presence of visible light, emitted by LEDs 18 and 19 shown in figures 3 and 4.
  • This visible light reflects on the cornea creating luminous dots 74 and 75.
  • the intersection of the optical axis with the cornea is calculated as the barycentre 76 of luminous dots 60, 61, 62 and 63, whereas the contour 56 of pupil 54 is determined by an "edge detection" algorithm like for the case described in figure 5.
  • the apparatus according to the invention is, furthermore, capable to carry out also a dynamic analysis during a transient between the extreme pupil conditions shown in figures 5 and 6.
  • a plurality is provided of light conductors, for example four, of which in the figure only the conductors 84 and 85 are shown, arranged about a central zone of disc 2 and oriented towards the eye 23.
  • said light conductors can commute themselves between infrared light emitted by infrared LEDs, for example 83 and 81, and visible light LEDs, for example 80 and 82.
  • LEDs and conductors are shielded for not giving backlight to disc 2.
  • Figure 8 shows an apparatus according to another aspect of the invention, comprising a plurality of light sources 90, for example blue light LEDs having a peak wavelength set between 450 and 490 ran, arranged along the boundary of Placido disc 2.
  • Such light sources have the object of exciting an amount of fluoresceine arranged between the cornea and a contact lens (not shown) applied on the cornea same of the eye 23 of the patient before the analysis.
  • This fluoresceine as well known, when excited by the above described blue light, emits visible light in a band, for example set between 530 and 570 niti, read by the videocamera 10.
  • the apparatus is capable of detecting images and/or films that allow to test the correct fitting of the contact lens on the eye and then to choose the contact lens that is most suitable for the geometry of an individual eye.
  • the excited fluoresceine produces a brighter area where it is thicker, thus showing, with varied colour tones, the different thicknesses of the gap present between lens and cornea.
  • This exemplary embodiment comprises also a plurality of infrared LEDs, for example respectively four LEDs 14, 15, 16, 17, arranged on the Placido disc 2 and a plurality
  • a selective filter 100 can be used that lets the transmission frequencies of
  • the filter 100 can be arranged on beam splitter 12.
  • the filter 100 being fixed, has to be designed in order to block the blue light that is used for exciting fluoresceine, leaving instead the wavelengths to
  • the filter 100 can be for example yellow, to cut wavelength components less than 530 ran.
  • the yellow filter can be removable.
  • a selective filter can be used that lets the sole wavelength of fluoresceine to pass, for example a range set between 530 and 570 nm.
  • Figure 9 shows a different exemplary embodiment of
  • Figures 10, 11 and 12 show respectively three further exemplary embodiments of the apparatus according to the invention, having a plurality of light sources 92 with normal light and respective filters 93, which cause light capable of exciting the above described fluoresceine to pass, arranged on the cornea of the patient.
  • figure 10 shows an apparatus, like that described in figures 1 - 7, having a plurality of LEDs 92 with filters 93 arranged peripherally to the Placido disc 2; figure 11 shows the above described LED 92 with filter 93 arranged behind the Placido disc 2, suitable for backlighting the disc same; and figure 12 shows a further exemplary embodiment comprising a plurality of LEDs 92 with respective filter 93 applied in special holes made through the Placido disc 2.
  • Figures 13 and 14 show a further exemplary embodiment of a device with function of corneal topography according to the invention capable to carry out a topographic analysis, a pupillometric analysis and a real analysis by fluoresceine, having two LEDs 95 and 96 that emit light in the spectrum of excitation of fluoresceine, applied near the centre of the Placido disc 2, in particular on the third opaque ring starting from the centre.
  • the apparatus comprises also LEDs 14, 15, 16, 17, 18, 19 that have the same functions of those described in figures 3 and 4.
  • the apparatus uses a beam splitter 12 having on a surface a fixed filter 100 capable of cutting the wavelengths that are lower than a predetermined value
  • Figures 15 and 16 show another exemplary embodiment of the invention, capable to carry out a topographic analysis and an analysis by fluoresceine, but not a pupillometric analysis, since the above described apparatus comprises blue LEDs 95 and 96 and not the described infrared LEDs for pupillometry.
  • this exemplary embodiment can comprise a filter 100 as described in the previous figures.
  • the apparatus can use a light source belonging to the spectrum of excitation of fluoresceine, oriented towards the above described beam splitter for being reflected and projected towards the eye along the optical path between the videocamera and the eye.

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

L’invention a pour objet un appareil d’analyse topographique de la cornée déterminant la courbure précise de la cornée et la position de l’axe optique afin de fournir une carte de ladite courbure à l’opérateur, servant également à l’analyse pupillométrique en déterminant le contour de la pupille et son centre relatif en conditions à la fois stables et dynamiques pendant la transition entre contraction (passage de la vision scotopique à la vision photopique) et dilatation (passage de la vision photopique à la vision scotopique) et/ou à l’analyse réelle par fluorescéine en testant une lentille de contact posée sur la cornée. L’appareil comprend une tête de mesure (6) à disque de Placido (2) rétroéclairé par une source lumineuse (31) afin d’entraîner la contraction de la pupille. Une caméra vidéo (10) coaxiale au disque (2) comprend une unité optique (11) pour la mise au point sur une image filmée. La tête de mesure (6) comprend une pluralité de DEL infrarouges, par exemple quatre DEL infrarouges (14, 15, 16, 17), permettant d’éclairer l’œil de manière à ne pas modifier l’ouverture de la pupille et deux DEL à lumière visible (18, 19) sur le disque de Placido (2) permettant d’entraîner la contraction de la pupille. La tête (6) comprend également une DEL de fixation de lumière visible (13) incidente sur un séparateur de faisceau (12) incliné de manière à aligner l’œil (23) par rapport à la caméra vidéo (10). La tête (6) peut, enfin, comporter deux DEL (95 et 96) émettant un rayon lumineux dans le spectre d’excitation de la fluorescéine, placées préalablement entre la cornée et une lentille de contact, et un filtre jaune fixe (100) monté sur ladite lame (12) permettant de ne laisser passer que le rayon lumineux intéressant l’analyse vers la camera vidéo (10).
EP05805155A 2005-10-14 2005-10-14 Appareil de topographie cornéenne à dispositifs supplémentaires intégrés Withdrawn EP1971253A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08008897A EP2016888A1 (fr) 2005-10-14 2005-10-14 Appareil de topographie de la cornée avec des dispositifs supplémentaires intégrés

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2005/003061 WO2007042854A1 (fr) 2005-10-14 2005-10-14 Appareil de topographie cornéenne à dispositifs supplémentaires intégrés

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP08008897A Division EP2016888A1 (fr) 2005-10-14 2005-10-14 Appareil de topographie de la cornée avec des dispositifs supplémentaires intégrés

Publications (1)

Publication Number Publication Date
EP1971253A1 true EP1971253A1 (fr) 2008-09-24

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Family Applications (2)

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EP05805155A Withdrawn EP1971253A1 (fr) 2005-10-14 2005-10-14 Appareil de topographie cornéenne à dispositifs supplémentaires intégrés
EP08008897A Withdrawn EP2016888A1 (fr) 2005-10-14 2005-10-14 Appareil de topographie de la cornée avec des dispositifs supplémentaires intégrés

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WO (1) WO2007042854A1 (fr)

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CN101852679B (zh) * 2010-06-01 2012-05-23 厦门大学 太阳镜对人眼防护性能的检测方法
DE102011081827A1 (de) * 2011-08-30 2013-02-28 Oculus Optikgeräte GmbH Ophthalmologisches Analysegerät und Verfahren
DE102011081825B4 (de) * 2011-08-30 2013-10-10 Oculus Optikgeräte GmbH Ophthalmologisches Analysegerät und Verfahren
CN102657512B (zh) * 2012-05-11 2014-12-31 浙江工业大学 一种应用于角膜地形图仪中的图像采集设备
CN103417188A (zh) * 2012-05-21 2013-12-04 晟爵（上海）科技有限公司 一种用于角膜地形图仪的绿光点指示器
CN103799976B (zh) * 2014-03-04 2016-01-20 厦门大学 一种干眼症综合诊断仪
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