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US 2004/0105073 A1Published application
Vision testing system
AssigneeAiVision Pty Ltd.
InventorsDesmond J Maddalena, Simon Grbevski
Life of this patent
Estimating the term…
Abstract
A method and apparatus are provided for testing the vision of a human subject using a series of eye tests (310). A test setup procedure (312) is run to adjust the settings of a display device (1914) such that graphic objects displayed on the device (1914) conform to a pre-defined appearance. A series of preliminary tests (314), static tests (316) and dynamic tests (318) are displayed on the device (1914), and the responses of the subject are recorded. The tests (310) may be run remotely, for example over the Internet. No lenses are required to run the tests (310).
Claims41
A method for testing vision of a human subject, said method comprising the steps of:
- (a) adjusting at least one setting of a display device such that a sequence of graphic objects displayed on said display device conforms to a pre-defined appearance;
- (b) displaying said sequence of graphic objects on said display device to test the visual functioning of the human subject,
- (c) recording at least one action of the human subject performed in response to the display of said sequence of graphic objects;
- (d) calculating from said recorded actions at least one aspect of the visual functioning of the subject;
- and
- (e) calculating at least one corrective lens prescription for the human subject from said at least one aspect of the visual functioning of the subject.
3 more elements
A method as claimed in any one of the preceding claims, wherein step (a) comprises the sub-steps of:
- (aa) loading computer executable instructions into a memory means of a computer connected to said display device;
- (ab) running a first portion of said computer executable instructions to adjust the black and white contrast of said display device to match a predetermined black and white contrast;
- and
- (ac) running a second portion of said computer executable instructions to adjust the intensity of at least one colour used in the display of colour images on said display device such that said at least one colour contained in images displayed on said display device conforms to a corresponding predefined colour.
1 more element
A method as claimed in any one of the preceding claims, wherein step (b) comprises the sub-steps of:
- (ba) displaying a first visual object on said display device such that said first visual object increases in size in the range from a predetermined minimum size to a predetermined maximum size;
- (bb) halting the growth of said first visual object as soon as the human subject, viewing said first visual object from a predetermined distance, is able to distinguish a feature of said first visual object;
- and step (c) comprises the sub-step of:
- (ca) recording the size of said first visual object when the growth of said first visual object was halted.
1 more element
A method as claimed in any one of the preceding claims, wherein step (b) comprises the further step of:
- (bd) displaying sets of straight lines on said display device, said lines being rotated from the vertical by angles ranging between 0° and 360°;
- step (c) comprises the step of:
- (cb) selecting those of said lines perceived by the human subject to be darker;
- and step (d) comprises the step of:
- (da) calculating an astigmatism of the human subject from said selected lines.
2 more elements
A method as claimed in any one of the preceding claims, wherein step (b) comprises the sub-steps of:
- (be) initialising a first visual object comprising parallel lines having a first spatial frequency and being rotated from the vertical by an angle between 0° and 360°;
- (bf) displaying said first visual object on said display device such that a spatial frequency of said parallel lines is progressively decreased from said first spatial frequency;
- (bg) halting sub-step (bf) when the human subject, viewing said first visual object from a predetermined distance, is able to distinguish a feature of said first visual object;
- and step (c) comprises:
- (cc) recording the spatial frequency of said parallel lines when step (bf) is halted.
2 more elements
A method as claimed in any one of the preceding claims, wherein step (b) comprises the sub-steps of:
- (bh) initialising at least one visual object at a first contrast level, said at least one visual object having a cyclically varying parameter and being rotated from the vertical by an angle between 0° and 360°;
- (bi) displaying said first visual object on said display device such that a contrast level of said at least one visual object is progressively increased from said first contrast level;
- (bj) halting sub-step (bi) when the human subject, viewing said first visual object from a predetermined distance, is able to distinguish a feature of said first visual object;
- and step (c) comprises:
- (cd) recording the contrast level of said at least one visual object when step (bi) is halted.
2 more elements
A method as claimed in any one of the preceding claims, wherein step (b) comprises the sub-steps of:
- (bk) displaying a fixation object and a positioning object such that said positioning object is in a blind spot of the human subject's vision when the human subject fixates on said fixation object from a predetermined distance from said display device;
- (bl) displaying a moving object and a pointer object while the human subject views said display device from said predetermined distance, said pointer object being controllable by the human subject to overlay said moving object;
- and
- (bm) intermittently displaying a peripheral object while the human subject controls said pointer object;
- and
- step (c) comprises the sub-step of:
- (ce) recording a response of the human subject if the human subject correctly observes said peripheral object while correctly positioning said pointer object over said moving object;
- and
- step (d) comprises the sub-step of:
- (dd) calculating a measure of said subject's peripheral vision from said response.
7 more elements
A method as claimed in any one of the preceding claims, wherein step (b) comprises the sub-steps of:
- (bn) displaying a fixation object and a positioning object such that said positioning object is in a blind spot of said subject's vision when the human subject fixates on said fixation object from a predetermined distance from said display device;
- and
- (bo) displaying a grid object associated with at least said fixation object;
- step (c) comprises the sub-step of:
- (cf) recording any irregularities in said grid object perceived by the human subject when said subject views said grid object from said predetermined distance and the human subject fixates on said fixation object;
- and
- step (d) comprises the sub-step of:
- (de) calculating a measure of said subject's macula integrity from said recorded irregularities.
5 more elements
A method as claimed in any one of the preceding claims, wherein step (b) comprises the sub-steps of:
- (bp) displaying a series of objects spaced at irregular intervals and requesting the human subject to identify said objects;
- and step (c) comprises the sub-step of:
- (cg) recording a number of correct identifications and a total time taken by the human subject to identify said objects.
A method as claimed in any one of the preceding claims, wherein step (b) comprises the sub-step of:
- (bq) displaying a series of objects and requesting said subject to identify those of said objects that are substantially identical;
- and step (cc) comprises the sub-step of:
- (ch) recording a number of correct identifications and a total time taken by said subject to identify said objects.
A method as claimed in any one of the preceding claims, wherein step (b) comprises the sub-step of:
- (br) displaying a sequence of numbers in a random order, each of said numbers having an associated letter, and requesting the human subject to locate said numbers in a prescribed order and to identify the associated letters;
- and step (c) comprises the sub-step of:
- (ci) recording a number of correct locations and identifications and a total time taken by the human subject to locate and identify said sequence.
A method as claimed in any one of the preceding claims, wherein step (b) comprises the sub-steps of:
- (bs) placing a first filter between a first eye of the human subject and said display device and a second filter between a second eye of the human subject and said display device;
- and
- (bt) displaying a first set of objects visible through said first filter but not visible through said second filter, and a second set of objects visible through said second filter but not visible through said first filter;
- step (c) comprises the sub-step of:
- (cj) recording a total number of objects seen by the human subject when viewing said display device with both eyes simultaneously;
- and
- step (d) comprises the sub-step of:
- (dh) calculating a measure of binocular vision of the human subject from said total number.
5 more elements
A method as claimed in any one of the preceding claims, wherein step (b) comprises the sub-steps of:
- (bu) placing a first filter between a first eye of the human subject and said display device and a second filter between a second eye of the human subject and said display device;
- and
- (bv) displaying a first set of objects visible through said first filter but not visible through said second filter, and at least one moveable object visible through said second filter but not visible through said first filter, said at least one moveable object being controllable by the human subject;
- step (c) comprises the sub-step of:
- (ck) recording whether or not the human subject can align said at least one moveable object with at least one object from said first set of objects;
- and
- step (d) comprises the sub-step of:
- (di) calculating a measure of alignment between the first eye and the second eye of the human subject.
5 more elements
A method as claimed in any one of the preceding claims, wherein step (b) comprises the sub-steps of:
- (bw) placing a first filter between a first eye of the human subject and said display device and a second filter between a second eye of the human subject and said display device;
- and
- (bx) displaying a first object visible through said first filter but not visible through said second filter, and a second object visible through said second filter but not visible through said first filter, such that the human subject viewing said first object and said second object perceives an image having an identifiable location;
- (by) moving said first object away from said second object on said display device until said subject no longer perceives said image;
- step (c) comprises the sub-step of:
- (cl) recording a separation between said first object and said second object when the human subject no longer perceives said image;
- and
- step (d) comprises the sub-step of:
- (dj) calculating from said separation a measure of the ability of the human subject to fuse images.
6 more elements
A method as claimed in any one of the preceding claims, wherein step (ca) comprises the sub-steps of:
- (ad) displaying one or more calibration objects on said display device;
- (ae) comparing a size of said one or more calibration objects with a size of a corresponding physical object;
- (af) adjusting the size of said one or more calibration objects to be substantially the same as the size of the corresponding physical object;
- and
- (ag) calibrating said display device based on said adjustment.
2 more elements
A method as claimed in any one of the preceding claims, wherein step (c) comprises the sub-steps of:
- (ah) displaying a set of objects having a first colour on said display device against a background having a second colour differing by less than 5% from said first colour;
- (ai) adjusting at least one source of ambient light if one or more of said set of objects are not visible when said display device is viewed from a predefined distance.
An apparatus for testing vision in a human subject, the apparatus comprising:
- means for adjusting at least one setting of a computer display such that a sequence of graphic objects displayed on said computer display conforms to a pre-defined appearance;
- means for displaying said sequence of graphic objects on said computer video display to test the visual functioning of said human subject,
- means for recording at least one action of said human subject performed in response to the display of said sequence of graphic objects;
- means for calculating from said recorded actions at least one aspect of the visual functioning of said subject;
- and
- means for calculating at least one corrective lens prescription for the human subject from said at least one aspect of the visual functioning of the subject.
3 more elements
A computer program element comprising computer program code means to make a computer execute a procedure to:
- adjust at least one setting of a video display of said computer such that a sequence of graphic objects displayed on said video display conforms to a pre-defined appearance;
- display said sequence of graphic objects on said video display to test the visual functioning of said human subject,
- record at least one action of said human subject performed in response to the display of said sequence of graphic objects;
- calculate from said recorded actions at least one aspect of the visual functioning of said subject;
- and
- calculate at least one corrective lens prescription for the human subject from said at least one aspect of the visual functioning of the subject.
3 more elements
A computer readable medium, having a program recorded thereon, where the program is configured to make a computer execute a procedure to:
- adjust at least one setting of a video display of said computer such that a sequence of graphic objects displayed on said video display conforms to a pre-defined appearance;
- display said sequence of graphic objects on said video display to test the visual functioning of said human subject,
- record at least one action of said human subject performed in response to the display of said sequence of graphic objects;
- calculate from said recorded actions at least one aspect of the visual functioning of said subject;
- and
- calculate at least one corrective lens prescription for the human subject from said at least one aspect of the visual functioning of the subject.
3 more elements
A system for the testing of vision in a human subject, said system comprising:
- a) a server having:
- a first memory for storing an application program and one or more test results from visual testing of a human subject;
- means for receiving said one or more test results;
- means for transmitting said application program;
- means for processing said one or more test results to calculate at least one aspect of the visual functioning of the human subject;
- and
- means for calculating at least one corrective lens prescription for the human subject from said at least one aspect of the visual functioning of the subject;
- and
- b) a client computer having:
- a display device for displaying a sequence of graphic objects to the human subject;
- means for receiving said application program;
- means for running said application program to adjust at least one setting of said display device such that said sequence of graphic objects displayed on said display device conforms to a pre-defined appearance;
- means for recording said one or more test results of the human subject in response to the display of said sequence of graphic objects;
- and
- means for transmitting said one or more test results to said server.
12 more elements
A method of standardising the appearance of visual objects displayed on a video display, the method comprising the steps of:
- installing an application program file on a computer;
- displaying said visual objects on said video display connected to said computer;
- requesting a person viewing said video display to confirm the size of at least one of said visual objects;
- requesting the person to confirm whether a specified one of said visual objects is visible;
- and
- said application program file utilising the responses of the person to said requests to adjust the relative outputs of the colours used in displaying said visual objects and the relative dimensions of said visual objects.
3 more elements
A method of testing the vision of a human patient characterised by displaying to said patient a plurality of interactive optical tests using a computerised display device and recording test results using said computerised display device.
A method for measuring the vision of a human subject, said method comprising the steps of:
- displaying on a display device a first test to check whether the vision of said subject is within a measurement range of said method;
- displaying on said display device a second test to determine a required sensitivity of said method;
- selecting, based on responses of said subject to said first and second tests, further tests to display on said display device to measure an optical power of one or both eyes of said subject;
- wherein said further tests are selected from the group consisting of:
- tests of visual acuity;
- tests of spherical power;
- tests of cylindrical power;
- tests for astigmatism;
- and
- tests for near visual acuity;
- and wherein said subject views said first test, said second test and said further tests without lenses being interposed between said display device and said subject.
8 more elements
Dependencies are inferred from the claim text.