AU6320199A - Apparatus and method for avoiding ocular muscular fatigue - Google Patents

Apparatus and method for avoiding ocular muscular fatigue Download PDF

Info

Publication number
AU6320199A
AU6320199A AU63201/99A AU6320199A AU6320199A AU 6320199 A AU6320199 A AU 6320199A AU 63201/99 A AU63201/99 A AU 63201/99A AU 6320199 A AU6320199 A AU 6320199A AU 6320199 A AU6320199 A AU 6320199A
Authority
AU
Australia
Prior art keywords
lenses
spectacles
apparatus
pair
method
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.)
Granted
Application number
AU63201/99A
Other versions
AU752418B2 (en
Inventor
Henri Kwok-Wai Lee
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.)
Positive Plan Pty Ltd
Original Assignee
Positive Plan Pty 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
Priority to AUPP6180 priority Critical
Priority to AUPP6180A priority patent/AUPP618098A0/en
Application filed by Positive Plan Pty Ltd filed Critical Positive Plan Pty Ltd
Priority to PCT/AU1999/000826 priority patent/WO2000019263A1/en
Priority to AU63201/99A priority patent/AU752418B2/en
Publication of AU6320199A publication Critical patent/AU6320199A/en
Application granted granted Critical
Publication of AU752418B2 publication Critical patent/AU752418B2/en
Anticipated expiration legal-status Critical
Application status is Ceased legal-status Critical

Links

Description

WO00/19263 PCT/AU99/00826 - 1 - APPARATUS AND METHOD FOR AVOIDING OCULAR MUSCULAR FATIGUE The present invention relates to an apparatus and method for the reduction or avoidance of muscular fatigue of the 5 eyes, and is of particular but not exclusive application in avoiding such muscular fatigue encountered during prolonged reading or close use of equipment such as computers. Existing apparatus for reducing the ill effects to the eyes 10 of prolonged reading or use of computers, or of other activities requiring the intensive, close use of the eyes, include non-prescription spectacles with colour lenses to act as filters 1) to reduce the glare from a surrounding light source and reflection from the surface on which the 15 eyes are focussed, and/or 2) to enhance the contrast sensitivity of the print or material being focussed upon (generally by means of a yellow filter). Other apparatus can be used to magnify the image on a 20 computer screen, thereby reducing the degree to which a user's eyes must focus small images. Such apparatus may employ 1) one or more Fresnel lenses, and/or 2) low plus lenses which also have magnifying effect, usually ranging from +0.50 to +0.75 spherical dioptre power. 25 It is an object of the present invention to provide an apparatus and method for reducing or avoiding ocular muscular fatigue in such circumstances. 30 According to a first broad aspect of the present invention there is provided an apparatus for avoiding ocular muscular fatigue comprising: a binocular light converging means for converging incident light, thereby reducing ocular convergence demand 35 when the apparatus is worn by a user. Thus, the extent to which the eyes of a user of a computer WO00/19263 PCT/AU99/00826 - 2 or reader of any text material must converge owing to the proximity of that computer or other text material (or other apparatus) is reduced by the apparatus according to the present invention, which performs part or much of the 5 required convergence by means of refraction. The eyes of the user may thereby be directed generally forward and parallel, even though the user is reading material or operating a computer or other apparatus whose proximity would normally require a convergence of as much as 150 or 10 more. Preferably the binocular light converging means is integral. 15 Thus, the binocular light converging means may comprise a pair of optical elements (such as lenses) but these are preferably formed integrally. Preferably the binocular light converging means is of 20 polycarbonate, acrylic or some other polymeric plastic material. Although the, for example, lenses may be made glass, it would generally be cheaper and more convenient to construct 25 them from a plastic material, which will also be less vulnerable to breakage. Preferably the binocular light converging means is a magnifying binocular light converging means. 30 Thus, the apparatus, in addition to reducing the required ocular convergence, may also magnify the user's view. Preferably the binocular light converging means includes or 35 is additionally at least one colour filter. Preferably the at least one colour filter reduces the WO00/19263 PCT/AU99/00826 - 3 intensity of transmitted yellow light. Thus, any benefits of reducing particular colour intensities may be combined with those of the convergence 5 according to the present invention. Preferably the binocular light converging means is provided in the form of a pair of optical elements and the apparatus includes adjustment means whereby the separation of the 10 optical elements may be adjusted according to pupil separation of a user. Thus, the apparatus may be adjusted so that the optical elements are positioned accurately relative to each eye of 15 a user. Preferably the light converging means comprises two lenses. Thus, although the light converging means are preferably 20 lenses, any suitable alternative may be employed, including prisms. Preferably each of the lenses comprises an optical wedge with a base, wherein the bases of the lenses are adjacent 25 thereby forming base-in prisms. Preferably the optical wedges are spherical optical wedges. Thus, the lenses are preferably formed from blanks of 30 spherical form, but thicker at one extremity relative to the other to provide the properties of an optical wedge. Preferably the lenses are 0.20 to 10 base lenses, more preferably 0.25 to 1.5 base lenses, and still more 35 preferably approximately 0.5 base lenses. Thus, lenses of higher base may be used but in normal use 2 WO00/19263 PCT/AU99/00826 - 4 or 3 base lenses may provide excessive convergence. Preferably the lenses are additionally prescription lenses. 5 Thus, the convergence effect of the apparatus according to the present invention may be combined with a corrective prescription to provide prescription glasses that also provide the convergence according to the present invention. 10 Preferably the lenses are provided as a pair of spectacles. According to a second broad aspect of the present invention there is provided a method for reducing ocular muscular fatigue due to convergence demand comprising converging 15 light prior to the light's incidence on a user's eyes. Preferably the light is converged by means of a pair of optical elements. 20 Preferably the optical elements are integral with each other. Preferably the optical elements are of a polycarbonate or other polymeric plastic material. 25 Preferably the optical elements are magnifying optical elements. Preferably the light is converged by means of two lenses. 30 Preferably each of the lenses comprises an optical wedge with a base, wherein the bases of the lenses are adjacent thereby forming base-in prisms. 35 Preferably the optical wedges are spherical optical wedges. Preferably the lenses are 0.20 to 10 base lenses.

WO00/19263 PCT/AU99/00826 - 5 Preferably the lenses are 0.25 to 1.5 base lenses. Preferably the lenses are approximately 0.5 base lenses. 5 Preferably the lenses are additionally prescription lenses. Preferably the optical elements are additionally colour filters. 10 Preferably the optical elements reduce the intensity of transmitted yellow light. Preferably the method includes adjusting the separation of 15 the optical elements according to pupil separation of a user. Preferably the optical elements are provided as a pair of spectacles. 20 It should be noted that the convergence of light produced by the apparatus or method according to the present invention will reduce the convergence demand on the user's eyes and thereby increase the divergence of the users eyes. 25 The present invention also provides a pair of spectacles for avoiding ocular muscular fatigue comprising: a pair of convergent lenses for converging incident light, thereby reducing ocular convergence demand 30 when the spectacles are worn by a user. Preferably each of the lenses comprises an optical wedge with a base, wherein the bases of the lenses are adjacent thereby forming base-in prisms. 35 Preferably the optical wedges are spherical optical wedges.

WO00/19263 PCT/AU99/00826 - 6 Preferably the lenses are 0.20 to 10 base lenses, more preferably 0.25 to 1.5 base lenses and still more preferably approximately 0.5 base lenses. 5 Preferably the lenses are integral with each other. Preferably the lenses are magnifying lenses. Preferably the spectacles are additionally prescription 10 spectacles. Preferably the spectacles include, or the lenses additionally comprise, one or more colour filters, and preferably the one or more colour filters reduce the 15 intensity of transmitted yellow light. Preferably the spectacles are provided with adjustment means whereby the lenses' separation may be adjusted according to pupil separation of a user. 20 Preferred embodiments of the invention will be described, by way of example, with reference to the accompanying drawings in which: Figure 1 is a view of a pair of spectacles in 25 accordance a preferred embodiment of the present invention; Figure 2 is a cross-sectional view through II-II of Figure 1; Figure 3 is a view of a pair of spectacles according to a further embodiment of the present invention; 30 and Figure 4 is a cross-section through IV-IV in Figure 3. A pair of spectacles according to a preferred embodiment of 35 the present invention is shown generally at 10 in Figure 1. The spectacles 10 have right and left lenses 12 and 14 respectively. Lenses 12 and 14 are polycarbonate or WO00/19263 PCT/AU99/00826 - 7 acrylic 0.5 base-in prismatic lenses (of zero spherical power, that is, so-called plano lenses). Figure 2 is a view of cross-section II-II in Figure 1, 5 together with ray tracings for a light source 16. Rays 18 and 20 diverging from light source 16 will, after impinging upon lenses 12 and 14 respectively, be refracted convergently, and emerge at 18a and 20b substantially parallel. Thus, when the spectacles 10 are worn by a user, 10 who may be reading from a book or a computer monitor, or manipulating some apparatus at close proximity, the degree of convergence required by that proximity is reduced or in some cases substantially eliminated. Consequently, the muscular effort required to maintain this convergence is 15 correspondingly reduced or eliminated, and the resultant muscular fatigue avoided. Lenses 12 and 14 have, in this embodiment, a negligible magnifying effect. Thus, the spectacles 10 reduce the 20 convergence demand on the user's eyes, without otherwise substantially altering the user's vision. A pair of spectacles according to an alternative embodiment of the present invention is shown generally at 30 in Figure 25 3. In this figure, only the lens portion of the spectacles is illustrated. Lenses 32 and 34 are formed integrally for reasons of manufacturing convenience. However, as can be seen in Figure 4, which is a cross-section through IV-IV in Figure 3, lenses 32 and 34 are again base-in prismatic 30 lenses, though formed within peripheral fabric 36, integral with lenses 32 and 34, which provides and forms the equivalent of the spectacles' frame and nose bridge. As with the first embodiment, light from light source 38 (for example rays 40 and 42) are converged by means of 35 refraction within lenses 32 and 34 to be substantially parallel at 40a and 42a.

WO00/19263 PCT/AU99/00826 - 8 In practice, the peripheral fabric 36 may either conform to the spherical geometry of lenses 32 and 34, or be shaped to provide a more comfortable or aesthetically pleasing appearance. In this latter case, it may be desirable to 5 provide peripheral fabric 36 with an opaque mask or substantially opaque colour so that light impinging upon peripheral fabric 36 will not distort or blur the image presented to the user. 10 Modifications within the spirit and scope of the invention may readily be effected by persons skilled in the art. For example, spectacles according to the present invention may be provided with an adjustable bridge so that the distance between the two lenses is adjustable, to conform to the 15 pupil separation of the user. Further, the lenses may be coloured to remove to some extent or completely certain colours that are thought to contribute to eye strain. Alternatively, the lenses may be somewhat modified to provide some magnification for greater ease of viewing or 20 may superimpose a user's spectacles' prescription on the optical wedge so that other defects of vision of the user may be corrected with the reduction in convergence demand. Accordingly, it is to be understood that this invention is not limited to the particular embodiments described by way 25 of example hereinabove.

Claims (43)

1. An apparatus for avoiding ocular muscular fatigue comprising: 5 a binocular light converging means for converging incident light, thereby reducing ocular convergence demand when said apparatus is worn by a user.
2. An apparatus as claimed in claim 1, wherein binocular 10 light converging means is integral.
3. An apparatus as claimed in either claim 1 or 2, wherein said binocular light converging means is of polycarbonate, acrylic or some other polymeric plastic material. 15
4. An apparatus as claimed in any one of the preceding claims, wherein said binocular light converging means is a magnifying binocular light converging means. 20
5. An apparatus as claimed in any one of the preceding claims, wherein said binocular light converging means includes or is additionally at least one colour filter.
6. An apparatus as claimed in claim 5, wherein said at 25 least one colour filter reduces the intensity of transmitted yellow light.
7. An apparatus as claimed in any one of the preceding claims, wherein said binocular light converging means is 30 provided in the form of a pair of optical elements and said apparatus includes adjustment means whereby the separation of the optical elements may be adjusted according to pupil separation of a user. 35
8. An apparatus as claimed in any one of the preceding claims, wherein said light converging means comprises two lenses. WO00/19263 PCT/AU99/00826 - 10
9. An apparatus as claimed in claim 8, wherein each of said lenses comprises an optical wedge with a base, wherein said bases of said lenses are adjacent thereby forming 5 base-in prisms.
10. An apparatus as claimed in claim 9, wherein said optical wedges are spherical optical wedges. 10
11. An apparatus as claimed in any one of claims 8 to 10, wherein said lenses are 0.20 to 10 base lenses.
12. An apparatus as claimed in claim 11, wherein said lenses are 0.25 to 1.5 base lenses. 15
13. An apparatus as claimed in claim 12, wherein said lenses are approximately 0.5 base lenses.
14. An apparatus as claimed in any one of claims 8 to 13, 20 wherein said lenses are additionally prescription lenses.
15. An apparatus as claimed in any one of claims 8 to 14, wherein the lenses are provided as a pair of spectacles. 25
16. A method for reducing ocular muscular fatigue due to convergence demand comprising converging light prior to said light's incidence on a user's eyes.
17. A method as claimed in claim 16, wherein said light is 30 converged by means of a pair of optical elements.
18. A method as claimed in claim 17, wherein said optical elements are integral with each other. 35
19. A method as claimed in either claim 17 or 18, wherein said optical elements are of a polycarbonate or other polymeric plastic material. WO00/19263 PCT/AU99/00826 - 11
20. A method as claimed in any one of claims 17 to 19, wherein said optical elements are magnifying optical elements. 5
21. A method as claimed in any one of claims 17 to 20, wherein said optical elements are a pair of lenses.
22. A method as claimed in claim 21, wherein each of said 10 lenses comprises an optical wedge with a base, wherein said bases of said lenses are adjacent thereby forming base-in prisms.
23. A method as claimed in claim 22, wherein said optical 15 wedges are spherical optical wedges.
24. A method as claimed in any one of claims 21 to 23, wherein said lenses are 0.20 to 10 base lenses. 20
25. A method as claimed in claim 24, wherein said lenses are 0.25 to 1.5 base lenses.
26. A method as claimed in claim 25, wherein said lenses are approximately 0.5 base lenses. 25
27. A method as claimed in any one of claims 21 to 26, wherein said lenses are additionally prescription lenses.
28. A method as claimed in any one of claims 17 to 27, 30 wherein said optical elements are additionally colour filters.
29. A method as claimed in claim 28, wherein said optical elements reduce the intensity of transmitted yellow light. 35
30. A method as claimed in any one of claims 17 to 29, wherein the method includes adjusting the separation of the WO00/19263 PCT/AU99/00826 - 12 optical elements according to pupil separation of a user.
31. A method as claimed in any one of claims 17 to 30, wherein the optical elements are provided as a pair of 5 spectacles.
32. A pair of spectacles for avoiding ocular muscular fatigue comprising: a pair of convergent lenses for converging 10 incident light, thereby reducing ocular convergence demand when said spectacles are worn by a user.
33. A pair of spectacles as claimed in claim 32, wherein each of said lenses comprises an optical wedge with a base, 15 wherein said bases of said lenses are adjacent thereby forming base-in prisms.
34. A pair of spectacles as claimed in claim 33, wherein said optical wedges are spherical optical wedges. 20
35. A pair of spectacles as claimed in any one of claims 32 to 34, wherein said lenses are 0.20 to 10 base lenses.
36. A pair of spectacles as claimed in claim 35, wherein 25 said lenses are 0.25 to 1.5 base lenses.
37. A pair of spectacles as claimed in claim 36, wherein said lenses approximately 0.5 base lenses. 30
38. A pair of spectacles as claimed in any one of claims 32 to 37, wherein said lenses are integral with each other.
39. A pair of spectacles as claimed in any one of claims 32 to 38, wherein said lenses are magnifying lenses. 35
40. A pair of spectacles as claimed in any one of claims 32 to 39, wherein said spectacles are additionally WO00/19263 PCT/AU99/00826 - 13 prescription spectacles.
41. A pair of spectacles as claimed in any one of claims 32 to 40, wherein spectacles include, or said lenses 5 additionally comprise, one or more colour filters.
42. A pair of spectacles as claimed in claim 41, wherein said one or more colour filters reduce the intensity of transmitted yellow light. 10
43. A pair of spectacles as claimed in any one of claims 32 to 42, wherein the spectacles are provided with adjustment means whereby the lenses' separation may be adjusted according to pupil separation of a user.
AU63201/99A 1998-09-28 1999-09-27 Apparatus and method for avoiding ocular muscular fatigue Ceased AU752418B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AUPP6180 1998-09-28
AUPP6180A AUPP618098A0 (en) 1998-09-28 1998-09-28 Apparatus and method for avoiding ocular muscular fatigue
PCT/AU1999/000826 WO2000019263A1 (en) 1998-09-28 1999-09-27 Apparatus and method for avoiding ocular muscular fatigue
AU63201/99A AU752418B2 (en) 1998-09-28 1999-09-27 Apparatus and method for avoiding ocular muscular fatigue

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU63201/99A AU752418B2 (en) 1998-09-28 1999-09-27 Apparatus and method for avoiding ocular muscular fatigue

Publications (2)

Publication Number Publication Date
AU6320199A true AU6320199A (en) 2000-04-17
AU752418B2 AU752418B2 (en) 2002-09-19

Family

ID=25633857

Family Applications (1)

Application Number Title Priority Date Filing Date
AU63201/99A Ceased AU752418B2 (en) 1998-09-28 1999-09-27 Apparatus and method for avoiding ocular muscular fatigue

Country Status (1)

Country Link
AU (1) AU752418B2 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3834077A1 (en) * 1988-10-06 1990-07-05 Kellner Helmut consider glasses to ermuedungsfreien the image plane of a screen or other image planes
US5204702A (en) * 1991-04-15 1993-04-20 Ramb, Inc. Apparatus and process for relieving eye strain from video display terminals
US5381191A (en) * 1993-04-14 1995-01-10 Levy; Chauncey F. Glasses for reducing eye strain during viewing of a CRT screen

Also Published As

Publication number Publication date
AU752418B2 (en) 2002-09-19

Similar Documents

Publication Publication Date Title
US3273456A (en) Bifocal loupes and telemicroscopic lenses therefor
US5886822A (en) Image combining system for eyeglasses and face masks
JP2910111B2 (en) Eyeglass-type retina direct display device
CA2057037C (en) Prism section lens spectacles
JP5871809B2 (en) Head-mounted display device
US5696521A (en) Video headset
US5546099A (en) Head mounted display system with light blocking structure
EP0045656B1 (en) Vision enhancing system
US20050078378A1 (en) Head-mounted virtual display apparatus for mobile activities
JP4155343B2 (en) An optical system for guiding light from two scenes to the viewer's eye alternatively or simultaneously
EP0389403A2 (en) A helmet mounted display having dual interchangeable optical eyepieces
US4923296A (en) Oriented simultaneous vision bifocal contact lenses or the like utilizing introaocular suppression of blur
DE69722398T2 (en) einstärkenlinsen improved
US7976157B2 (en) Eyewear for reducing symptoms of computer vision syndrome
EP0601845A1 (en) Multifocal ophthalmic lens pair
TWI337270B (en) Method and apparatus for controlling peripheral image position for reducing progression of myopia
US5408278A (en) Method and device for enhancing visual and color perception
US6036315A (en) Optically superior decentered over-the-counter sunglasses
US5118178A (en) Corrective lenses
JP5369121B2 (en) Spectacle lens evaluation method, spectacle lens design method, spectacle lens manufacturing method, spectacle lens manufacturing system, and spectacle lens
US9720238B2 (en) Method and apparatus for a dynamic “region of interest” in a display system
US5777715A (en) Low vision rehabilitation system
JP4600290B2 (en) Visual auxiliary display device
US5812100A (en) Image display apparatus
TW558664B (en) Eyewear for relief of computer vision syndrome

Legal Events

Date Code Title Description
FGA Letters patent sealed or granted (standard patent)