Method for assessing spectacle lens by evoked activity in visual cortex of brain or the like, and method for designing spectacle lens using said method for assessment
First Claim
1. A method for evaluating spectacle lenses by an evoked activity of a visual cortex of a subject'"'"'s brain, the method comprising:
- presenting the subject with a visual stimulus object for observation at a peripheral part away from a fixation point to which attention of the subject is paid, wherein the subject is wearing a lens to be evaluated while observing the visual stimulus object, and wherein the visual stimulus object evokes an activity of a specific part of the brain'"'"'s visual cortex;
measuring the evoked activity of the specific part of the brain'"'"'s visual cortex as a change in at least one of an electric potential or a magnetic field of the brain'"'"'s visual cortex when the visual stimulus object is visually observed by the subject through the lens to be evaluated, wherein the evoked activity is measured using an electroencephalograph, a magnetoencephalograph, or a combination thereof;
determining an evaluation index for the lens to be evaluated from the measured evoked activity by calculating a magnitude of the change in at least one of the electric potential or magnetic field and a latency in response of the visual cortex to the visual stimulus; and
evaluating the performance of the lens relative to the subject based on the evaluation index.
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Accused Products
Abstract
[Problem] To provide an evaluation method for evaluating spectacle lenses that is capable of objectively evaluating spectacle lenses suitable for a user by measuring brain activity, and a design method for designing spectacle lenses using the evaluation method.
[Solution] A subject is allowed to wear to-be-evaluated lenses, and the subject is allowed to visually observe a visual stimulus object used to evoke an activity of a specific part of the visual cortex of the brain through the to-be-evaluated lenses, and an evoked activity of the specific part of the brain'"'"'s visual cortex when the visual stimulus object is visually observed by the to-be-evaluated lenses is measured by an electroencephalograph or by a magnetoencephalograph, and the spectacle lenses are evaluated based on time (latency) from when a visual stimulus is received till when a change is caused thereby or based on the magnitude (amplitude) of activity.
18 Citations
20 Claims
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1. A method for evaluating spectacle lenses by an evoked activity of a visual cortex of a subject'"'"'s brain, the method comprising:
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presenting the subject with a visual stimulus object for observation at a peripheral part away from a fixation point to which attention of the subject is paid, wherein the subject is wearing a lens to be evaluated while observing the visual stimulus object, and wherein the visual stimulus object evokes an activity of a specific part of the brain'"'"'s visual cortex; measuring the evoked activity of the specific part of the brain'"'"'s visual cortex as a change in at least one of an electric potential or a magnetic field of the brain'"'"'s visual cortex when the visual stimulus object is visually observed by the subject through the lens to be evaluated, wherein the evoked activity is measured using an electroencephalograph, a magnetoencephalograph, or a combination thereof; determining an evaluation index for the lens to be evaluated from the measured evoked activity by calculating a magnitude of the change in at least one of the electric potential or magnetic field and a latency in response of the visual cortex to the visual stimulus; and evaluating the performance of the lens relative to the subject based on the evaluation index. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for evaluating a plurality of spectacle lenses by an evoked activity of a visual cortex of a subject'"'"'s brain, the method comprising:
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for each lens of the plurality of lenses to be evaluated, presenting the subject with a visual stimulus object for observation at a peripheral part away from a fixation point to which attention of the subject is paid while the subject is wearing the lens, wherein the visual stimulus object evokes an activity of a specific part of the brain'"'"'s visual cortex; measuring, for each lens to be evaluated, the evoked activity of the specific part of the brain'"'"'s visual cortex as a change in at least one of an electric potential or a magnetic field of the brain'"'"'s visual cortex when the visual stimulus object is visually observed by the subject through the lens, wherein the evoked activity is measured using an electroencephalograph, a magnetoencephalograph, or a combination thereof; determining, for each lens to be evaluated, an evaluation index based on the measured evoked activity, wherein the evaluation index includes a magnitude of the change and a latency in response of the visual cortex to the visual stimulus object; evaluating the performance of each lens relative to the subject based on the corresponding evaluation index; and selecting the lens corresponding to the evaluation index having the greatest magnitude of change, the shortest latency in response, or both the greatest amplitude or magnitude of change and the shortest latency in response. - View Dependent Claims (19, 20)
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Specification