Petitioner: Haag-Streit AG
`Petitioner: Haag-Streit AG
`
`Ex. 10(cid:20)(cid:22)
`
`EX. 1013
`
`

`

`[19]
`United States Patent
`[11]
`[45]
`
`Sigelman
`
`Patent Number:
`
`Date of Patent:
`
`4,671,631
`* Jun. 9, 1987
`
`[54]
`
`[76]
`
`[*1
`
`[21]
`
`[22]
`
`[63]
`
`[51]
`[52]
`
`[58]
`
`[56]
`
`BINOCULAR OPHTHALMOSCOPE
`
`Inventor:
`
`Notice:
`
`Jesse Sigelman, 69 E. 71 St., New
`York, NY. 10021
`
`The portion of the term of this patent
`subsequent to Sep. 3, 2002 has been
`disclaimed.
`
`Appl. No.:
`Filed:
`
`871,023
`
`Jun. 5, 1986
`
`Related US. Application Data
`
`Continuation of Ser. No. 650,329, Sep. 12, 1984, Pat.
`No. 4,637,699, which is a continuation-in—part of Ser.
`No. 391,694, Jun. 24, 1982, Pat. No. 4,538,888.
`
`
`................ A61B 3/10
`U.S. Cl. .................................... 351/205; 351/214;
`351/245
`Field of Search ................ 351/205, 214, 219, 211
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`8/1956 Thorburn ............................ 351/205
`2,757,574
`3,403,957 10/1968 Wilkinson
`..... 351/205
`3,582,191
`6/1971 Cohen .............. 351/221
`3,652,153
`3/1972 Gambs ................................ 351/214
`
`FOREIGN PATENT DOCUMENTS
`
`0048181
`2053502
`
`9/1981 European Pat. Off.
`6/1979 United Kingdom .
`
`.
`
`OTHER PUBLICATIONS
`
`Fincham, “A Combined Hand Slit Lamp and Binocular
`Microscope”, The Optician 1—29—1960 pp. 58—59,
`The Exeter Indirect Opthalmoscope, Catalog Sheet.
`Mentor Slit Lamps, Catalog Sheet.
`Kowa SL—2 and SL—S Slit Lamp Microscope, Catalog
`Sheet.
`
`Primary Examiner—Rodney B. Bovernick
`Assistant Examiner—D. M. Dzierzynski
`Attorney, Agent, or Firm—Sprung Horn Kramer &
`Woods
`
`[57]
`
`ABSTRACT
`
`A binocular opthalmoscope, having an optical viewing
`system, a light source and headgear mountable on an
`examiner’s head during use for supporting the optical
`viewing system in optical alignment with the examiner’s
`eyes and the light source with the output thereof above
`the optical viewing system. The light source has a selec-
`tor for for selectively providing both full beam and slit
`beam illumination of a patient’s eye, a first condensing
`lens for focusing light on the bull beam or slit beam
`aperture, a second condensing lens for refocusing the
`light passing through the aperture onto an aerial image
`of the retina, and a third lens for shortening the focal
`length of the beam emitted from the light outlet of the
`light source and which is mounting for pivotal move—
`ment into and out of the beam path.
`
`3 Claims, 11 Drawing Figures
`
`
`
`
`
`5/ gall-at:
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`
`

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`U. S. Patent
`
`Jun. 9,1987
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`Jun. 9, 1987
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`Jun. 9, 1987
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`

`1
`
`BINOCULAR OPHTHALMOSCOPE
`
`RELATED APPLICATIONS
`
`4,671,631
`
`2
`retina, vitreous body, posterior hyaloid or other poste—
`rior portions of the eye without use of a Goldmann
`contact lens or an auxiliary mounted Hruby lens to
`eliminate corneal refraction. Both the Goldmann cor—
`
`This is a continuation of application Ser. No. 650,329
`filed 9.12.84 now U.S. Pat. No. 4,637,699 which is a
`continuation-in-part of application Ser. No. 391,494
`filed June 24, 1982 now U.S. Pat. No. 4,538,888.
`
`BACKGROUND OF THE INVENTION
`
`This invention relates to an apparatus for examination
`of the eye, and in particular,
`to such an apparatus
`adapted for examination of the retina, vitreous, pigment
`epithelium, choroid, cornea, anterior chamber,
`iris,
`crystalline lens and anterior vitreous of the human eye.
`More specifically, this invention relates to a binocular
`ophthalmoscope having head gear to be worn on an
`examiner’s head for supporting an optical viewing sys-
`tem and a light source for illuminating a patient’s eye.
`The light source is laterally movable to permit illumina-
`tion of the patient’s eye from various angles with re-
`spect to the optical viewing system. The viewing sys-
`tem may be a binocular indirect ophthalmoscope which
`is used in conjunction with a hand held condensing lens
`to view an aerial or indirect image of the eye; a binocu-
`lar biomicroscope for a direct microscopic view of the
`eye; or a binocular biomicroscope which is used to-
`gether with a hand held condensing lens, for viewing an
`enlarged aerial image of the eye. The laterally movable
`light source is adapted to provide both slit beam and full
`beam illumination of the patient’s eye.
`The invention may be used to provide a fullbeam
`illuminated view to conduct examination of the fundus
`
`for retinal mapping or for full field viewing of the cor-
`nea, anterior chamber, iris, crystalline lens or vitreous.
`The invention may be used to provide a centered or
`angulated slit directly illuminated view of the retina and
`of the vitreous to detect vitreous attachments, retinal
`discontinuities, tumors of the choroid or pigment epi-
`thelium. Additionally, the invention may be used to
`provide a centered or angulated slit retro-illuminated
`view of the retina and vitreous gel to provide, in effect,
`a “back lighted” view of the posterior segment of the
`eye. Further,
`the invention permits the examiner to
`perform ophthalmoscopy of the vitreous and peripheral
`retina using simultaneously a slit beam light source
`together with manual scleral depression.
`Binocular ophthalmoscopes of various types have
`been long known in the art, but their usefulness and
`flexibility have generally been restricted to use in exam—
`ination of only a limited portion of the eye, or have
`involved the use of bulky equipment and of cumber—
`some and uncomfortable contact lenses on the patient’s
`eye. None of these instruments permit a practical exami-
`nation of the relationship of the peripheral retina to the
`vitreous. Further, none of these instruments permits a
`practical examination of the vitreous and peripheral
`retina by simultaneous use of slit beam illumination and
`scleral depression. For example, binocular indirect oph-
`thalmoscopes of the type illustrated in U.S. Pat. Nos.
`3,582,191 to Cohen; 3,963,329 to Stumpf et a1; and
`2,757,574 to Thombum may be used only to view the
`retina of the eye, are incapable of slit beam or retro
`illumination and cannot be used for examination of the
`
`diaphanous vitreous or other anterior portions of the
`eye. Conventional slit
`lamp biomicroscopes such as
`illustrated in U.S. Pat. Nos. 3,652,153 to Gambs or
`3,403,957 to Wilkinson are incapable of examining the
`
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`neal contact lens and the mounted Hruby lens present
`significant disadvantages to the examination of a pa-
`tient. The Goldman contact lens is cumbersome and
`uncomfortable and requires anesthetization of the pa-
`tient’s cornea. Moreover,
`it may not conveniently be
`used with scleral depression which is required to bring
`the peripheral retina into View. The mounted Hruby
`lens has a very limited field of view permitting examina-
`tion only of the posterior retina and optic nerve. Also,
`since the Hruby lens is fixed relative to the biomicro-
`scope and the patient is generally stationary relative to
`the biomicroscope, the examiner cannot follow move-
`ment of the patient’s eye and cannot view the retinal
`periphery with slit beam illumination.
`SUMMARY OF THE INVENTION
`
`The present invention overcomes the limitations asso-
`ciated with prior binocular indirect ophthalmoscopes
`and slit lamp biomicroscopes by providing an apparatus
`which simply and conveniently permits examination of
`all portions of the eye, both anterior and posterior,
`including the posterior retina, peripheral retina, pig-
`ment epithelium, choroid, vitreous, cornea, anterior
`chamber, iris, crystalline lens, in full beam illumination,
`and angulated or centered slit direct illumination, or
`angulated or centered slit retroillumination.
`Accordingly, it is an overall object of the present
`invention to provide a binocular ophthalmoscope
`which may be conveniently and flexible utilized for a
`wide range of examinations of the human eye. Specifi-
`cally, the various features of the present invention both
`individually and in combination are particularly appro-
`priate for the one handed operation that is required
`when the user must hold the condensing lens in the
`other hand.
`
`It is a further object of this invention to provide a
`head wearable binocular ophthalmoscope having a light
`source selectively providing both slit beam and full
`illumination of the patient’s eye as well as different
`color filters.
`
`It a further object of this invention to provide a head
`wearable binocular ophthalmoscope having a light
`source selectively providing both full and slit illumina-
`tion of the patient’s eye wherein such lamp is laterally
`movable to provide both centered and angulated slit
`illumination.
`
`It is a further object of this invention to provide a
`head wearable binocular ophthalmoscope which selec-
`tively provides for the viewing of an inverted reversed
`aerial image of the eye, a full field nonaerial micro-
`scopic View of the eye, and a magnified aerial image of
`the eye.
`It is yet a further object of this invention to provide,
`in combination, a head wearable binocular ophthalmo-
`scope with a laterally movable attached light source
`permitting the examiner to perform ophthalmoscopy of
`the vitreous and peripheral retina using simulatneously
`a slit beam light source together with manual scleral
`depression.
`In accordance with the present invention, there is
`provided a binocular ophthalmoscope having an inter-
`changeable optical viewing system, a head gear adapted
`to be worn on an examiner’s head supporting the view-
`
`

`

`3
`ing system in optical alignment with the examiner‘s
`eyes. and a selective full or slit beam light source
`mounted on the headgear and laterally moveable for
`direct or angulated illumination ofa patient‘s eyes. In a
`particular illustrative embodiment demonstrating ob-
`jects and features of the present invention, the viewing
`system is a conventional binocular indirect ophthalmo-
`scope which may be interchanged with a conventional
`binocular biomicroscope. The viewing system can be
`constructed to optically function at any convenient
`desired working distance.
`typically of from approxi-
`mately 4 inches to approximately 30 inches. The light
`source is slideably affixed to the head gear on a slide bar
`with detents defining predetermined position which can
`be reproducibly obtained.
`The light source has an aperture and color filter selec-
`tor built therein with a plurality of color filters disposed
`on a rotatably disk for the selection of any one at a time
`and a rotatable disk which has a plurality of slit aper-
`tures therein and a full beam aperture for selection by
`the user. A mirror assembly is also provided at
`the
`output of the light source which includes a four diopter
`lens which is mounted to swing into place at the base of
`the light source and whose purpose is to shorten the
`focal length of the light beam to permit the device to be
`used as a slit lamp biomicroscope in combination with a
`high power loupe in the viewing system.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`The above objects, aspects and advantages of the
`invention, as well as others, will be apparent from the
`detailed description of the preferred embodiment of the
`invention considered in conjunction with the drawings,
`which should be considered in an illustrative and not in
`a limiting sense, as follows:
`FIG. 1 is a side elevation view of a binocular ophthal—
`moscope in accordance with the present invention;
`FIG. 2 is a top plan View of the binocular ophthalmo—
`scope shown in FIG. 1;
`FIG. 3 is a front elevation‘view of the binocular
`ophthalmoscope shown in FIG. 1;
`FIG. 4 is a sectional view of the binocular ophthal—
`moscope taken on line 4 of FIG. 3;
`FIG. 5 is a sectional view of the viewing system of
`the binocular ophthalmoscope taken on line 5 of FIG. 3;
`FIG. 6 is a front elevation view of an alternative
`viewing system for use in the binocular ophthalmo—
`scope shown in FIG. 1;
`FIG. 7 is a side elevation view of the alternative
`viewing system shown in FIG. 6;
`FIG. 8 is a bottom plan view of the alternative view-
`ing apparatus shown in FIG. 6;
`FIG. 9 is a sectional view of the light source assembly
`of the binocular ophthalmoscope taken on line 9—9 of
`FIG. 1; and
`FIGS. 100 and 10b are plan views of disks for inser—
`tion in the light source assembly shown in FIG. 9.
`DETAILED DESCRIPTION OF THE
`DRAWINGS
`
`Referring to FIG. 1, a complete binocular ophthal—
`moscope is illustrated generally at 10. The binocular
`ophthalmoscope includes a head gear assembly gener-
`ally indicated by 12, a light source assembly generally
`indicated by 14 and a viewing system generally indi-
`cated by 16.
`Referring to FIGS. 1 and 2, it is seen that the head
`gear assembly 12 includes an adjustable head mount 18,
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`a viewing system support 20 and a light source support
`assembly 22. The adjustable head mount 18 is provided
`with a resilient pressure pad 24 and an adjustment as-
`sembly 26. The viewing system support assembly 20
`includes support arms 300 and b, a cross bar 32, having
`an integral threaded bore 48, a mounting bracket 34, a
`mounting bracket bar 35 and a height adjustment screw
`36. The light source support assembly 22 includes sup-
`port arms 38a and b. a slide bar 40 and first and second
`angle brackets 42 and 44. The first and second angle
`brackets 42 and 44 are conventionally joined to each
`other to form a single support structure fixed at one end
`to the adjustable head mount 18. The viewing system
`support arm 300 and the light source assembly support
`arm 380 are pivotably coupled about a common axis to
`one side of the adjustable head mount 18 by a fastener
`28a. while the viewing system support arm 30b and the
`light source assembly support arm 38b are pivotably
`coupled about a common axis to the opposite side of the
`adjustable head mount 18 by a fastener 28b.
`As best seen in FIGS. 2 and 4, the cross bar 32 and the
`mounting bracket bar 35 of the viewing system support
`assembly 20 are frictionally engaged within slots 460
`and b of the viewing system support arms 300 and b,
`respectively. The height adjustment screw 36 engages
`the threaded bore 48 of the cross bar 32 and is rotatably
`mounted by conventional means at the junction of the
`first and second angle brackets 42 and 44. The mounting
`bracket 34 is secured by conventional means to the
`mounting bracket bar 35 so that the mounting bracket
`bar 35 together with the mounting bracket 34 may pivot
`within the slots 460 and b of the viewing system support
`arms 30a and b. The thumbscrew 50 is provided on the
`mounting bracket 34 for securing the viewing system 16
`by its mounting bracket 51 to the viewing system sup-
`port assembly 20. The slide bar 40 is supported at each
`end by the light source assembly support arms 380 and
`b and supported centrally by the first and second angle
`brackets 42 and 44.
`As best seen in FIGS. 3, 4, and 9, the light source
`assembly 14 includes a light source mount 52, a mirror
`assembly 54, a lens assembly 56 and a lamp assembly 58.
`The light source mount 52 slideably engages with the
`slide bar 40 of light source support assembly 22 and is
`continuously movable along the length of the slide bar
`40. Slide bar 40 has detense 201 spaced therealong
`which are engageable with projection 202 on light
`source mount 52. This enables the user to preset the
`light source to a given location which is reproducible
`each time the device is used. This greatly simplifies the
`use of the device when only one hand is available for
`setting the position of the light source. The slide bar 40
`is shown as being relatively straight, but may also be are
`shaped. It has been found that the extent of longitudinal
`movement of the light source mount 52 and the light
`source assembly 14 on the relatively straight slide bar 40
`should preferably subtend a distance of at least approxi-
`mately two tenths of the maximum effective working
`distance of the viewing system 16. A locking screw 60
`is provided to fix the light source mount 52 at any de-
`sired position along the slide bar 40. The lens assembly
`56 is rotatably held within the light source mount 52 to
`permit aiming of the light source assembly 14 at the
`patient’s eye at any position along the slide bar 40. If an
`are shaped slide bar is used, the necessity for reaiming
`the light source assembly 14 to accommodate various
`positions along the slide bar can be minimized. A lock-
`ing screw 61 is provided to secure the lens assembly 56
`
`

`

`4,671,631
`
`5
`at the desired orientation within the light source mount
`52.
`
`As best seen in FIGS. 9 and 4. the lens assembly 56
`includes a three—piece housing assembly 62, a condenser
`lens system 64 and an objective lens 66. The housing
`assembly 62 includes first and second outer tubes 68 and
`70. an inner tube 72 and an aperture and color filter
`selector 230. The selector 230 is positioned and fixed at
`the juncture between tube 70 and tube 68.
`Selector 230 has the general appearance of rectangu-
`lar box comprising two housing portions 231, 232 in
`which disks 233 and 234 are rotatably mounted. Disk
`233 shown in more detail
`in FIG. 100.
`is rotatably
`mounted on pin 235 through hole 243 therein. Mounted
`on disk 233 are three filters, filter 240 which allows
`white light to pass therethrough, filter 241 which allows
`green light to pass therethrough and filter 242 which
`allows blue to pass therethrough. Disk 234 is mounted
`for rotation on pin 236 through hole 255 therein and
`includes a circular aperture 250 for full beam imaging
`and various slit beam apertures 251—254. Pins 235 and
`236 have projecting portions 237 and 238 respectively,
`which coact with detense 244 and 256 in order to enable
`
`the user to position the disks with the desired aperture
`and desired filter centered within tubes 68 and 70.
`The condenser lens system 64 is mounted within the
`first outer tube 68 and includes first and second plano—
`convex lenses 81 and 82. Objective lens 66 is mounted
`within the inner tube 72 which in turn is
`fixedly
`mounted within the second outer tube 70.
`
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`example, Osram lamp No. 64260, and is mounted in the
`conventional lamp base 104 which is affixed to the lamp
`housing 98. The vent cover 100 forms a part of the lamp
`housing 98 immediately above the lamp 102 and is pro-
`vided to dissipate, by convection, excess heat generated
`by the lamp 102.
`Referring to FIG. 5, the viewing system 16 is seen as
`a conventional binocular indirect ophthalmoscope hav-
`ing a pair of slideable viewing lenses 106a and b. coop-
`erating with a pair of slideable mirrors 1080 and b and a
`pair of fixed mirrors 110a and b. The slideable viewing
`lenses 106a and b and the slideable mirrors 108a and b
`are adapted to accommodate varying interpupillary
`distances of the examining physician’s eyes. The slide—
`able viewing lenses 106a and b ar conventionally ap-
`proximately 3 diopters. The fixed mirrors 1100 and b
`function to reduce this interpupillary distance,
`thus
`permitting both of the examining physician’s eyes to
`“look into” a patient’s eye. The viewing system 16 is
`used in conjunction with a hand held condensing lens
`(not shown) of approximately 14 to 30 diopters to elimi—
`nate corneal difraction and provide an inverted re-
`versed aerial image of the retina, vitreous jelly, pigment
`epithelium and choroid of the patient’s eye.
`Referring to FIGS. 6, 7 and 8, an alternative binocu-
`lar biomicroscope viewing system 112 is seen. The bin—
`ocular biomicroscope 112 includes a pair of conven-
`tional compound microscope loupes 113a and b which
`are individually rotatably mounted on a sliding rack 114
`in a conventional manner. The binocular biomicroscope
`viewing system 112 includes a hinged mount 11 for
`attachment to the viewing system support assembly 20.
`The sliding rack 114 is adjustable by rotation of a knob
`118 to accommodate the interpupillary distance of the
`examiner‘s eyes, and the compound microscope loupes
`113a and b individually rotate by turning knobs 115a
`and b for aiming at the patient’s eye. The alternative
`binocular biomicroscope viewing system 112 provides a
`direct, nonaerial microscopic view of the anterior por-
`tion of the eye or,
`in conjunction with a hand held
`condensing lens (not shown) an enlarged aerial or indi-
`rect view of the posterior segment of the eye.
`To commence an examination of a patient’s eye by
`use of the binocular ophthalmoscope 10 of the present
`invention, the ophthalmoscope 10 is placed on the ex-
`aminer’s head so that the light source assembly 14 and
`viewing system 16 are facing forward,
`towards the
`patient. The examiner tightens the adjustable head-
`mount 18 by use of the adjustment assembly 18, so that
`the headgear assembly 12 firmly rests upon the examin-
`er’s head. The examiner moves the viewing system 16
`into optical alignment with his or her eyes by adjusting
`the height of the viewing system 16 through use of the
`height adjustment screw 36, adjusting the distance be-
`tween the slideable viewing lenses 106a and b, and ad-
`justing the distance between the viewing system 16 and
`the examiner’s eyes by pivoting the viewing system 16
`about the mounting bracket bar 34 within the slots 46a
`and b of the viewing system support arms 30a and b.
`The examiner then activates the lamp 102 of the light
`source assembly 14, places in the desired filter 240—242
`and aperture 250—254 and focuses the light source as-
`sembly 14 by swinging lens 210 into the light path. By
`tilting his or her head, use of angle adjustment screw 94
`and rotation of lens assembly 56 within light source
`mount 52, the examiner can aim the light produced by
`the light source assembly 14 at the patient’s eye. An
`examination typically commences with a non angulated
`
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`In order to effect focusing of the light from the light
`column when the device is used as a bio microscope, a
`plus four diopter lens 210 is hingedly mounted by hinge
`220 to mirror housing 96 to swing into position as
`shown in FIG. 9 and out of position as shown in FIG. 4.
`This lens acts to shorten the focal length of the light
`beam to permit the device to be used as a slit
`lamp
`biomicroscope in combination with high power 6><
`loups. The use of this lens eliminates the need to focus
`lens 66 with respect to lens 64. The lens 210 comprises
`a cylindrical body 212 housing the four diopter lens 211
`and which is connected via a hinge including portions
`223 mounted to lens housing 96 portion 222 connected
`to lens body 212 and rotatably connected via pin 221.
`A locking screw 84 is provided to fix the inner tube
`72 at a desired focused position. The mirror assembly 54
`is mounted at the lower end of the inner tube 72 and
`includes a mirror 86, a pivot 88, a post 90, a spring 92,
`an angle adjustment screw 94 and a housing 96. The
`mirror 86 is adjustably mounted at an angle of approxi-
`mately 45 degrees with respect to the axis of inner tube
`72 and is secured on the pivot 88. The post 90 extends
`from the back of the mirror 86 through an aperture in
`the mirror housing 96 and is partially surrounded by the
`spring 92. One end of the spring 92 abuts against the
`mirror housing 96 and the other end abuts against the
`back of the mirror 86, thus providing stability to the
`mirror 86 in any adjusted position. The angle adjust-
`ment screw 94 is threaded through the mirror housing
`96 so that it abuts against the back of the mirror 86.
`Rotation of the angle adjustment screw 94 permits fine
`adjustment of the angle of the mirror 86 about the pivot
`88 so that the light produced by the light source assem-
`bly 14 can be aimed at the patient’s eye.
`The lamp assembly 58 is mounted on the upper end of 65
`the first outer tube 68 and includes a lamp housing 98, a
`vent cover 100, a lamp 102 and a lamp base 104. The
`lamp 102 is a conventional linear coil filament lamp, for
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`4,671,631
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`7
`slit beam illuminated view ofthe patient's eye. For such
`an examination, the light source assembly is centered on
`the slide bar 40 and locked into place by the locking
`screw 60. Retro-illumination is achieved by aiming the
`light source assembly 14 so that the slit beam is slightly
`displaced from the portion ofthe eye being observed so
`that such portion receives only indirect lighting. Direct
`illumination is achieved by aiming the light source as-
`sembly 14 so that the slit beam is aimed directly at the 10
`portion of the eye being observed. A second portion of
`a typical examination entrails viewing the eye by angu-
`lated slit illumination, either direct or retro. For such an
`examination, the light source assembly 14 is decentered
`and moved to a desired position on the slide bar 40. The
`aim of the light source assembly is adjusted by rotating
`the lens assembly 56 within the light source mount 52.
`Examination with full beam illumination or with the
`
`IS
`
`8
`light source means having a light outlet for illuminat-
`ing a patient's eye; and
`headgear means mountable on an examiner's head
`during use for supporting the optical viewing sys-
`tem in optical alignment with the examiner‘s eyes
`and the light source means with the light outlet
`above the optical viewing system;
`wherein the light source means includes means for
`selectively providing both full beam and slit beam
`illumination of a patient’s eye comprising a first
`disk having a full beam aperture and a plurality of
`slit beam apertures therein and means mounting the
`disk for rotation to dispose one aperture in the
`beam path at a time, and wherein the light source
`means includes a cylindrical housing and the head-
`gear means includes means mounting the cylindri-
`cal housing for movement only in a lateral direc—
`tion and for rotation about the axis of the housing
`independent of the lateral movement to alter the
`angle of the light beam from the light source means
`without changing its vertical angulation whereby
`the use can independently adjust the lateral posi—
`tion of the light beam and angle of the light beam
`independently and without affecting the vertical
`angulation.
`2. The binocular ophthalmoscope according to claim
`1, wherein the means for providing both full and slit
`beam illumination further comprises a second disk hav-
`ing a plurality of light filters therein and means mount-
`ing the second disk for rotation to dispose one filter in
`the beam path at a time and the adjacent aperture in the
`beam path.
`3. The binocular ophthalmoscope according to claim
`1, wherein the means for providing both full and slit
`beam illumination further comprises detent means for
`indicating when each filter and aperture is aligned in the
`beam path.
`*
`1k
`*
`is
`3k
`
`alternate viewing system 112 proceeds in essentially the 20
`same manner.
`
`As is apparent from the foregoing specification, the
`present invention is susceptible of being embodied with
`various alterations and modifications which may differ
`particularly from those that have been fully described. 25
`For example, as is known in the art,
`it
`is possible to
`utilize a continuously variable slit rather than slides
`having various fixed slits. Laser light or colored incan-
`descent light could replace the white incandescent bulb
`as the light source. For this reason, it is to be fully un-
`derstood that all of the foregoing is intended to be
`merely illustrative and is not to be construed or inter-
`preted as being restrictive or otherwise limiting of the
`present invention.
`What is claimed is:
`
`35
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`30
`
`1. A binocular ophthalmoscope, comprising:
`an optical viewing system;
`
`40
`
`45
`
`50
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`55
`
`6O
`
`65
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`