Title of Invention

LENS-FREE OPHTHALMOSCOPE

Abstract A lens-free ophthalmoscope (21,41) comprising: means (22,42) wherein at least the outer surface of the tube being opaque defining a first light path (a); reflective means (23,43) arranged to divert light from the first light path (a) along a second light path (b) extending through a first window (24,44) and into a subject eye (29,49) ; a second window (25,45) through which an user can view a subject eye (29,49) along a path (d) extending generally parallel to the second light path(b); and a baffle (23,26 ; 43,46) wherein the baffle (43,46) comprising the block (46) is arranged between the first light path(a) and second window (25,45) to prevent, or at least substantially reduce, any light exiting the ophthalmoscope through the second window (25,45).
Full Text FORM 2
THE PATENTS ACT, 1970 (39 of 1970)
COMPLETE SPECIFICATION (See Section 10, rule 13)
LENS-FREE OPHTHALMOSCOPE
..OPHTHALMOS LIMITED' of UNIT 1 ABBEY BARNS DUXFORD ROAD, ICKL.ETQN, CAMBRIDGE, CAMBRIDGESHIRE, CB10 1SX UNITED KINGDOM BRITISH Company
The following specification particularly describes the nature of the invention and the manner in which it is to be performed : -
ORIGINAL
560/MUMNP/04


LENS-FREE OPHTALMOSCOPE

Field of the Invention
5 This invention relates to ophthalmoscopes and especially, but not exclusively, to ophthalmoscopes which are simple and inexpensive to manufacture.
Background to the Invention
10
15
An ophthalmoscope is usually a complex optical instrument used for examining the retina of humans and animals. Generally, ophthalmoscopes have more than twenty lenses and from three to six lights and, as such, are intricate and costly to manufacture and buy.
Examples of such know types of ophthalmoscope are disclosed in GB-A-2235308, GB-A-2204144, WO-A-2000/30527 and DE-A-3714041.
Ophthalmoscopes are used routinely during the day-to-day work of doctors, optometrists, veterinary surgeons, health workers and trainees of the above.
25 However, due to the expensive nature of this instrument, only limited numbers are available for actual use and certainly there is no way that an ophthalmoscope can be provided for each, for example, doctor who needs to use one.
30
Due to the shortage of these instruments and their complexity, students and even non-specialised medical

staff very often do not get a chance to learn how to use this instrument properly.
This situation is worse in less developed and
5 third world countries where in some places there are no
ophthalmoscopes available to local doctors or aid
workers, because they are simply too expensive to buy
or manufacture.
10 The problem of the restricted numbers of ophthalmoscopes in hospitals, opticians and veterinary surgeries, along with the associated lack of expertise in using the instrument, when available, is therefore potentially serious and any attempt to reduce the
15 complexity of the instrument and the manufacturing costs, is sought.
"Manufacture and Use of Homemade Ophthalmoscopes: a 150th Anniversary Tribute to Helmholtz" a publication
20 from BMJ, 23-30 December 2000, Vol 321, pl557-1559, discloses a simple ophthalmoscope. This instrument, although much simpler and cheaper to produce than standard ophthalmoscopes, has a major problem in that the sight hole through which the retina is observed,
25 causes glare in the observer's eye, thereby severely reducing the view.
Any method of producing cheaply a simple
ophthalmoscope which eliminates, or at least
30 substantially reduces, the problems commonly associated
with the simple ophthalmoscope disclosed in the above
mentioned paper, is therefore sought.

Present Invention
5 Accordingly it is an object of the present invention to overcome, or at least substantially reduce the disadvantages associated with known types of ophthalmoscope, such as those discussed above.
10 Thus, the invention provides a lens-free ophthalmoscope comprising:
means defining a first light path;
15 reflective means arranged to divert light from the first light path along a second light path exiting the ophthalmoscope through a first window and into a subject eye;
20 a second window through which an user can view a subject eye along a path extending generally parallel to the second light path; and
a baffle which is arranged between the first light 25 path and the second window to prevent, or at least substantially . reduce, any light exiting the ophthalmoscope through the second window.
The ophthalmoscope may also comprise a light
30 source, which can be incorporated with the other
components of the apparatus as another component

thereof, or may be arranged to receive a separate, detachable light source.
The first light path defining means may comprise a 5 tube wherein, preferably, at least the outer surface of the tube is opaque and the inner surface may be non-reflective.
The reflective means may comprise a mirror,
10 preferably semicircular, which is inclined at
approximately 45° to the first light path and/or the
second light path. Alternatively, the reflective means
may comprise a prism.
15 The first window can be an aperture in, for example, a tube defining the first light path. Any such aperture is preferably circular. The second window may be in the otherwise closed end of the tube, for example, in a roof of the tube. Again, this second
20 window is preferably circular.
The reflective means may be associated with the baffle which is preferably either a flange or a block. With a block, the reflective means is preferably 25 mounted thereon.
The positioning and dimensions of the baffle
ensure that little or no light reaches the second
window and, as a consequence, no, or very little, glare
30 through the second window is experienced by an
observer.

Thus, it can be seen that the lens-free nature of an ophthalmoscope in accordance with the invention, as defined above, provides an inexpensive product which is 5 simple to use and prevents, or at least reduces substantially, any glare due to the prevention or at least substantial reduction, of any undesirable light exiting the ophthalmoscope via its second window into the eye of an observer. 10
Brief Description of the Drawings
Figure 1 shows a partial exploded view of a prior art ophthalmoscope; 15
Figure 2 shows the prior art ophthalmoscope of Figure 1 assembled, with a detachable light source provided;
20 Figures 3 to 5 show the prior art ophthalmoscope of Figures 1 and 2 in use;
Figure 6 shows a partial section of a first embodiment of ophthalmoscope in accordance with the 25 invention and in use; and
Figures 7 to 9 show a second embodiment, again in partial section, of ophthalmoscope in accordance with the invention and in use.

Detailed Description of Drawings
Referring firstly to Figures 1 to 5 of the 5 drawings, a prior art lens-free ophthalmoscope, indicated generally at 1, comprises a tube 2 defining a first light path a, as shown in Figures 3 and 5, reflective means in the form of an oval mirror 3, a first window 4 in the form of a circular aperture in 10 the side wall of the tube 2, a second window 5 in the form of a circular aperture in an oval roof 7 of the tube 2, and a glare disc 6, there being no lenses used.
The ophthalmoscope 1 is arranged such that the 15 mirror 3 forms the underside of the inclined roof 7 of the tube 2, with the second window 5, passing generally centrally through the mirror 3.
This mirror 3 diverts light passing from a light 20 source 8 along the first light path a, as shown in Figure 3, along a second light path b exiting the tube 2 through the first window 4 and into a subject eye 9.
The second window 5 allows an user 10 to view the 25 subject eye 9 along a path extending generally parallel to and coincident with the second light path b.
However, as can be seen from Figures 2, 3 and 5,
this design has a problem, in that the second window 5
30 causes glare, as indicated diagrammatically at c, in
the eye 10 of an observing user, thereby severely

reducing the view of the subject eye 9, because some of the light from light path a exits through the second window 5, causing this undesirable glare at the eye 10 of the observer.
5
In order to reduce this glare, the glare disc 6 is secured to the upper surface of the inclined roof 7 of the tube 2, with a centrally-located, circular aperture 11 lying in-register with the circular aperture of the
10 second window 5. In effect, the thickness of the glare disc 6 in the region of the central aperture 11 increases the total thickness of the two apertures 5 and 9, in an attempt to reduce glare at the eye 10 of the observer.
15
However, and as discussed briefly above, such a
remedy was unsuccessful, with an observing user still
experiencing an unreasonable amount of glare passing
through the respective in-register apertures 5, 11 of
20 the tube roof 7 and glare disc 6.
As can be seen from Figure 2, the light source 8 is provided by a light pen 12 inserted in the bottom end of the tube 2 which is opaque and which preferably 25 has a matt black, non-reflective inner surface.
In order to eliminate, or at least substantially
reduce, this glare associated with the known
ophthalmoscope 1 discussed above in relation to Figures
30 1 to 5, a lens-free ophthalmoscope in accordance with
the invention is provided with a baffle arranged

between the first light path and second window, as will be described in more detail hereinbelow with respect to the two embodiments of inventive ophthalmoscope shown in Figures 6 and 7 to 9 respectively. 5
Referring therefore to Figure 6, a first embodiment of ophthalmoscope, indicated generally at 21, comprises an opaque tube 22 of which only the top end is shown and which defines a first light path a,
10 reflective means in the form of a planar semi-circular mirror 23, a first window 24 formed as a circular aperture in the side wall of the tube 22, a second window 25 in the form of a circular aperture in the roof 27 of the tube 22 and a baffle 26 in the form of a
15 flange located between the first light path a and the second window 25. As can be seen, no lenses are employed.
Light passing along a first light path 3 from a 20 light source (not shown), such as the light source 8 of a light pen 12 shown in Figure 2, is reflected through 90° at the 45° angled mirror 23 along a second light path b which then passes through the first window 24 and then into a subject eye 29. 25
The mirror 23 is mounted to a downwardly extending extension 31 of the flanged baffle 26, at 45° thereto.
The eye 30 of an observing user is able to view 30 the retina of the .subject eye 29 along a path d extending through the second and first windows 25, 24,

such path d being generally parallel to the second light path b.
Because the baffle 26, and to a certain extent its 5 extension 31, is located between the first light path a and the second viewing window 25, any light which might otherwise pass through that window 25 into the eye 30 of an user, is eliminated or at least substantially reduced, thereby substantially reducing glare and 10 enhancing the user's view of the subject eye 29.
Spurious light which is not diverted along the light path b is substantially absorbed by the matt black interior surface of the tube 22.
!5
Turning now to the second embodiment of ophthalmoscope 41 shown in Figures 7 to 9, again only the top end of a tube 42 defining a first light path a is shown, along with a planar mirror 43, a first window
20 44 in the form of a circular aperture in the side wall of the tube 42, a second window 45 in the form of a circular aperture in the roof 47 of the tube 42 and a block 4 6 upon which the mirror 43 is mounted and which, in turn, is mounted to the tube roof 47. Again, also,
25 no lenses are used.
Light from a light source passing along the first light path a defined by the tube 42, is reflected by the mirror 43 through 90° along the light path b and 30 then into a subject eye 49.

such path d being generally parallel to the second light path b.
Because the baffle 26, and to a certain extent its 5 extension 31, is located between the first light path a and the second viewing window 25, any light which might otherwise pass through that window 25 into the eye 30 of an user, is eliminated or at least substantially reduced, thereby substantially reducing glare and 10 enhancing the user's view of the subject eye 29.
Spurious light which is not diverted along the light path b is substantially absorbed by the matt black interior surface of the tube 22.
15
Turning now to the second embodiment of ophthalmoscope 41 shown in Figures 7 to 9, again only the top end of a tube 42 defining a first light path a is shown, along with a planar mirror 43, a first window
20 44 in the form of a circular aperture in the side wall of the tube 42, a second window 45 in the form of a circular aperture in the roof 47 of the tube 42 and a block 4 6 upon which the mirror 43 is mounted and which, in turn, is mounted to the tube roof 47. Again, also,
25 no lenses are used.
Light from a light source passing along the first light path a defined by the tube 42, is reflected by the mirror 43 through 90° along the light path b and 30 then into a subject eye 49.

That eye 4 9 can be viewed by the eye 50 of an observing user along a path d extending through the second and first windows 45, 44. 5
The combination of the block 46 and mirror 43, as well as the dimensions thereof, and particularly the thickness, of the block 46, acts as a baffle between the first light path a and second viewing window 45, 10 thereby eliminating, or at least substantially reducing, any glare which might otherwise enter the user's eye via the second viewing window 45 and which is thus prevented from doing so.
15 As in the case of the first embodiment described above in relation to Figure 6, this second embodiment also enhances the viewing capability of a user's eye 50 into the subject eye 4 9 along the path d, as shown in Figures 6 and 7, which is substantially parallel to the
20 second light path b.
It is to be appreciated that the mirror 4 3 and
supporting block 4 6 of the second embodiment described
above in relation to Figures 8 and 9 may be replaced by
25 the mirror 23 and flanged baffle 26 of the first
embodiment described above in relation to Figure 6.
Thus, it can be seen that an ophthalmoscope 21', 41
in accordance with the invention eliminates, or at
30 least substantially reduces, any glare in the eye of an
observing user, thereby dramatically improving the

WE CLAIM:
1. A lens-free ophthalmoscope (21,41) comprising: means (22,42) wherein at least the outer surface of the tube being opaque defining a first light path (a); reflective means (23,43) arranged to divert light from the first light path (a) along a second light path (b) extending through a first window (24,44) and into a subject eye (29,49) ; a second window (25,45) through which an user can view a subject eye (29,49) along a path (d) extending generally parallel to the second light path(b); and a baffle (23,26 ; 43,46) wherein the baffle (43,46) comprising the block (46) is arranged between the first light path(a) and second window (25,45) to prevent, or at least substantially reduce, any light exiting the ophthalmoscope through the second window (25,45).
2. A lens-free ophthalmoscope (21,41) as claimed in claim 1, wherein the first light path(a) defining means (22,42) comprises a tube.
3. A lens-free ophthalmoscope (21,41) as claimed in claim 2 or 3, wherein the inner surface of the tube (22,42) is non-reflective.
4. A lens-free ophthalmoscope (21,41) as claimed in any preceding claim, wherein said reflective means (23,43) comprises a mirror.
5. A lens-free ophthalmoscope (21,41) as claimed in claim 5, wherein the mirror (23,43) is semi-circular.
6. A lens-free ophthalmoscope (21,41) as claimed in any preceding claim, wherein said reflective means (23, 43) is inclined at approximately 45 to the first light path (a) and/or the second light path(b).
7. A lens-free ophthalmoscope (21,41) as claimed in any of claims 1 to 4, wherein the reflective means (23, 43) comprises a prism.

8. A lens-free ophthalmoscope (21,41) according to any preceding claim, wherein the first window (24,44) is an aperture.
9. A lens-free ophthalmoscope (21,41) according to any preceding claim, wherein the second window (25,45) is an aperture.
10. A lens-free ophthalmoscope (21,41) according to any preceding claim, wherein said reflective means (23, 43) is mounted on the baffle (23,26 ; 43,46).
11. A lens-free ophthalmoscope (21,41) according to any preceding claim, wherein the baffle (23,26) comprises a flange (26).
12. A lens-free ophthalmoscope (21,41) according to any preceding claim, wherein, in use, the baffle (23, 26; 43,46) ensures that substantially all light passing along the first light path (a) is diverted along the second light path (b), with no or substantially no light exiting the second window (25, 45).
Dated this 6th day of October, 2004.
HIRAL CHANDRAKANT JOSHI
AGENT FOR
OPHTHALMOS LIMITED

Documents:

560-mumnp-2004-claims(granted)-(22-03-2005).doc

560-mumnp-2004-claims(granted)-(22-03-2005).pdf

560-mumnp-2004-correspondence(22-03-2005).pdf

560-mumnp-2004-correspondence(ipo)-(12-04-2007).pdf

560-mumnp-2004-drawing(22-03-2005).pdf

560-mumnp-2004-form 19(07-10-2004).pdf

560-mumnp-2004-form 1a(07-10-2004).pdf

560-mumnp-2004-form 2(granted)-(22-03-2005).doc

560-mumnp-2004-form 2(granted)-(22-03-2005).pdf

560-mumnp-2004-form 3(07-10-2004).pdf

560-mumnp-2004-form 3(22-03-2005).pdf

560-mumnp-2004-form 5(22-03-2005).pdf

560-mumnp-2004-form-pct-isa-210(07-10-2004).pdf

560-mumnp-2004-general power of attorney(07-10-2004).pdf

560-mumnp-2004-general power of attorney(22-03-2005).pdf

abstract1.jpg


Patent Number 205888
Indian Patent Application Number 560/MUMNP/2004
PG Journal Number 42/2008
Publication Date 17-Oct-2008
Grant Date 12-Apr-2007
Date of Filing 07-Oct-2004
Name of Patentee OPHTHALMOS LIMITED
Applicant Address UNIT 1 ABBEY BARNS DUXFORD ROAD, ICKLETON, CAMBRIDGE, CAMBRIDGESHIRE, CB10 1SX UNITED KINGDOM,
Inventors:
# Inventor's Name Inventor's Address
1 ARMOUR, ROGER, HANIF TABLEY HOUSE, 88 WYMONDLEY ROAD, HITCHIN, HERTFORDSHIRE SG4 9PX
PCT International Classification Number A61B 3/12
PCT International Application Number PCT/GB02/05758
PCT International Filing date 2002-12-18
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 0208776.5 2002-04-17 U.K.