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WO2013001422A1 - Procédé et dispositif d'obtention d'une image ophtalmique - Google Patents

Procédé et dispositif d'obtention d'une image ophtalmique Download PDF

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Publication number
WO2013001422A1
WO2013001422A1 PCT/IB2012/053130 IB2012053130W WO2013001422A1 WO 2013001422 A1 WO2013001422 A1 WO 2013001422A1 IB 2012053130 W IB2012053130 W IB 2012053130W WO 2013001422 A1 WO2013001422 A1 WO 2013001422A1
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WO
WIPO (PCT)
Prior art keywords
light
optical path
lens
retina
optical
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.)
Ceased
Application number
PCT/IB2012/053130
Other languages
English (en)
Inventor
Shyam Vasudeva RAO
Chandrasekhar KUPPUSWAMY
Bharath HEGDE
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.)
Forus Health Pvt Ltd
Original Assignee
Forus Health Pvt Ltd
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 Forus Health Pvt Ltd filed Critical Forus Health Pvt Ltd
Publication of WO2013001422A1 publication Critical patent/WO2013001422A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • A61B3/12—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for looking at the eye fundus, e.g. ophthalmoscopes

Definitions

  • the present disclosure relates to ophthalmic imaging devices for obtaining image of retina of an eye.
  • the disclosure relates to construction of the device using a single light source.
  • Ophthalmic imaging systems operate by directing light into a patient's eye to illuminate a portion of the retina. A camera then captures an image of the illuminated potion of the retina via light reflected from the retina.
  • Such system is provided with for example two or more types of monochromatic light sources such as an infrared LED (Light Emitting Diode), a red color LED, a green color LED, a blue color LED, and others. These light sources are selectively used according to purposes of medical examinations.
  • Typical low power ophthalmic imaging devices such as Fundus cameras make use of LEDs as light source.
  • Fig.l shows the typical ophthalmic imaging device.
  • the typical ophthalmic device consist an objective lens (102), one or more half mirrors (Ml, M2, M3), LED light sources of different wavelength (SI, S2, S3) with collimators and a detector (104) such as an image sensor.
  • the ophthalmic imaging device consists of an infrared light LED source and for capturing images; the imaging device consists of a white light LED source.
  • the two LED light sources as mentioned above requires different optical paths since the two LED light sources cannot overlap on each other. If there is a need for an internal fixation light or a red free source, an additional light source is provided. This additional light source results in an additional optical path.
  • FIG. 2 An exemplary embodiment of the typical ophthalmic imaging device is shown in Fig. 2.
  • An optic path of a ray of light emitted by at least one light source (S3) travelling from source to detector (104) is illustrated.
  • the one or more half mirrors (Ml, M2, and M3) are placed to divert the ray from the original path.
  • the mirrors (Ml, M2, and M3) reflect majority of incident light, but a portion of input radiation of the incident light is lost due to absorbance and scattering.
  • the total loss of intensity of a light beam at mirror is called as attenuation.
  • intensity of light source (S3) should be very high, which results in high power rating of the LED.
  • the existing ophthalmic imaging device suffers from a number of limitations.
  • the device consists of multiple reflectors and multiple half mirrors resulting in increase of cost of the device.
  • the device also requires different optical paths for different sources of light.
  • the device is not portable as the design is complex and bulky.
  • the device is more vulnerable to environment factors such as dust and humidity.
  • the device requires high power rating due to losses from attenuation and scattering. Multiple mirrors increase complexity of the device design and reduce the precision of the device.
  • the present disclosure relates to a low power ophthalmic imaging device using multicolored LED based light source.
  • the device of the disclosure helps in reducing number of components required for capturing an image.
  • the imaging device of the present disclosure substitutes for standard optical devices comprising various half mirrors and different LED light sources for ophthalmic imaging.
  • the ophthalmic imaging device of the present disclosure provides an advantage of cost reduction as compared to the existing devices.
  • the overall weight of the device also is reduced, increasing portability of the device as compared to existing devices. Reduction in number of LEDs results in lower power consumption of the device as compared to exiting devices.
  • the device of the present disclosure also supports multi spectral imaging. The quality of the illumination improves due to decrease reflections from mirrors.
  • an ophthalmic imaging device comprising a lens at one end of a first optical path and an optical detector at other end of the first optical path.
  • the device further comprises a multicolored Light Emitting Diode (LED) at one end of a second optical path and other end of the second optical path intersecting the first optical path.
  • a beam splitter of the device is placed at a predetermined angle at the intersection of the first and the second optical paths. The beam splitter directs the light emitted by the light source to the lens.
  • the lens illuminates retina of an eye from the emitted light and collects the light reflected from the retina.
  • the collected light is directed towards the optical detector by the lens.
  • Said optical detector detects the amount of light reflected to form an ophthalmic image.
  • a method for obtaining an ophthalmic image comprises emitting a light of at least one color from multicolored LED via a second optical path. Then the emitted light is directed by a beam splitter to a lens through a first optical path which illuminates retina of an eye by the received. The retina reflects the light which is collected at the lens and the collected light is passed to an optical detector through the first optical path. Finally, the collected light is processed to obtain an image of the retina to form an ophthalmic image.
  • Figure 1 illustrates a conventional ophthalmic imaging device.
  • Figure 2 illustrates an optical path of a light ray emitted from light source of conventional ophthalmic imaging device.
  • Figure 3 illustrates ophthalmic imaging device with a multicolored LED in accordance with an embodiment of the present disclosure.
  • an ophthalmic imaging device comprising a lens at one end of a first optical path and an optical detector at other end of the first optical path.
  • the device further comprises a multicolored Light Emitting Diode (LED) at one end of a second optical path and other end of the second optical path intersecting the first optical path.
  • a beam splitter of the device is placed at a predetermined angle at the intersection of the first and the second optical paths.
  • the beam splitter directs the light emitted by the light source to the lens.
  • the lens illuminates retina of an eye from the emitted light and collects the light reflected from the retina.
  • the collected light is directed towards the optical detector by the lens.
  • Said optical detector detects the amount of light reflected to form an ophthalmic image.
  • the beam splitter is selected from at least one of a half silvered mirror and a pellicle mirror.
  • the beam splitter comprises a reflection region and a transmission region.
  • the multicolored LED emits light of wavelength in the range of 430 nm to 940 nm.
  • the optical detector is selected from at least one of image sensor and human eye.
  • a method for obtaining an ophthalmic image comprises emitting a light of at least one color from multicolored LED via a second optical path. Then the emitted light is directed by a beam splitter to a lens through a first optical path which illuminates retina of an eye by the received. The retina reflects the light which is collected at the lens and the collected light is passed to an optical detector through the first optical path. Finally, the collected light is processed to obtain an image of the retina to form an ophthalmic image.
  • passing the collected light from the lens to the optical detector comprises transmitting the light through the beam splitter.
  • Figure 3 illustrates ophthalmic imaging device with a multicolored LED in accordance with an embodiment of the present disclosure.
  • the ophthalmic imaging device comprises a lens (102) and an optical detector (104) on a first optical path (302).
  • One end of the first optical path (302) is provided with the lens (102) and other end of the first optical path (302) comprises the optical detector (104).
  • a single light source, i.e. a multicolored LED (304) is placed at one end of a second optical path (306).
  • the other end of the second optical path (306) intersects the first optical path (302).
  • the second optical path (306) perpendicularly intersects the first optical path (306).
  • second optical path (306) intersects the first optical path (302) at a predetermined angle.
  • the multicolored LED (304) at the opening of the second optical path (306) produces light beam of desired color when it is actuated by power supply.
  • the multicolored LED light source (304) emits light of wavelengths ranging from 430 nm (Ultra blue) to 940 nm (infrared). Further, the multicolored LEDs are operated between voltage ranges of 1.5 V to 3.5 V at 20 mA.
  • the light beam generated by the light source passes through the second optical path (302) and falls on a beam splitter (Ml).
  • the beam splitter (Ml) is an optical device that splits a beam of light in two. In an embodiment, a pellicle mirror can be used as a beam splitter (Ml).
  • a half mirror is used as a beam splitter (Ml).
  • the half mirror (Ml) is placed at the intersection of the first optical path (306) and the second optical path (302) at a predetermined angle.
  • the half mirror acts as a reflecting and well as transmitting unit.
  • the light beam passing through the second optical path (306) is made to incident on the half mirror (Ml), which deflects the light beam to the lens (102).
  • the lens passes the light beam to an eye in proximity of the lens.
  • the light beam penetrates the eye and diverges to illuminate a portion of the retina of the eye. Consequently, the retina light reflected from the retina is received and collected by the lens (102).
  • the lens (102) then transmits the collected light to the beam splitter (half mirror) through the first optical path (302).
  • the half mirror (Ml) acts as transmitting unit.
  • the half mirror (Ml) is made of transparent material which allows reflected image of the object under observation to pass through it.
  • the light beam transmitted from the half mirror (Ml) is transmitted to the optical detector (104).
  • the optical detector (104) captures image of the retina based on the light reflected from the retina. This image is then used to detect eye diseases and problems.
  • the optical detector (104) can be an image sensor configured to capture the image in digital format. The image can then be analyzed to detect any problem in the eye.
  • the optical detector (104) can be human eye, i.e. eye of doctor. The doctor will view and analyze the image for any medical condition.
  • a combination of image sensor and human eye can be used as optical detector (104). Both the human eye and the image sensor can simultaneously view and analyze the image.
  • the ophthalmic imaging device of the present disclosure is simple in construction.
  • the number of optical paths required for the light beam to travel is reduced. Only single path is used for the transferring the light beam from the LED light source to the object under observation. Hence, the device is easily portable.
  • the multicolored LED can produce light of desired color by varying the power supply.
  • the detector (104) could be a camera which generates an image based on the light coming from lens (102). Further, the person skilled in the art would identify the type of lights that are required to be generated and the operating conditions to determine diseases or problems in the eye.

Landscapes

  • 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

La présente invention concerne un équipement d'imagerie ophtalmique permettant d'obtenir une image d'un oeil. Dans un mode de réalisation, on décrit un dispositif d'imagerie ophtalmique présentant une seule source de lumière, c'est à dire une DEL multicolore et un trajet optique unique pour la source de lumière. Le dispositif ophtalmique comprend en particulier une lentille ophtalmique et un détecteur optique monté aux extrémités du premier trajet optique. La source de lumière à DEL multicolore est disposée à l'entrée d'un second trajet optique. Une autre extrémité du second trajet optique croise le premier trajet optique, un demi-miroir étant placé à leur intersection.
PCT/IB2012/053130 2011-06-28 2012-06-21 Procédé et dispositif d'obtention d'une image ophtalmique Ceased WO2013001422A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN2180CH2011 2011-06-28
IN2180/CHE/2011 2011-06-28

Publications (1)

Publication Number Publication Date
WO2013001422A1 true WO2013001422A1 (fr) 2013-01-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2012/053130 Ceased WO2013001422A1 (fr) 2011-06-28 2012-06-21 Procédé et dispositif d'obtention d'une image ophtalmique

Country Status (1)

Country Link
WO (1) WO2013001422A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2469249A (en) * 2008-02-01 2010-10-06 Linos Photonics Gmbh & Co Kg Combined ocular fundus scanning device for OCT and funus imaging
US20100253911A1 (en) * 2007-07-30 2010-10-07 Richard Holley Optical Measurement Apparatus and Method Therefor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100253911A1 (en) * 2007-07-30 2010-10-07 Richard Holley Optical Measurement Apparatus and Method Therefor
GB2469249A (en) * 2008-02-01 2010-10-06 Linos Photonics Gmbh & Co Kg Combined ocular fundus scanning device for OCT and funus imaging

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ANONYMOUS: "3nethra Presented to Aravind Eye Hospital, Madurai", 31 October 2010 (2010-10-31), XP002685007, Retrieved from the Internet <URL:http://forushealth.com/forus/about-us/3-3nethra-was-presented-to-aravind-eye-care-madurai> [retrieved on 20121010] *

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